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Cheap flights from Seattle to London Heathrow Airport from C$ 476

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 17/9. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
SEA — LHR
6 May — 13 May1
1 adult
Mon 6/5
Mon 13/5

The best prices from Seattle/Tacoma Intl to London Heathrow are usually found in February or January, booked 62 days in advance, depart on a Tuesday or Saturday and return on a Wednesday

Cheap flight deals from Seattle to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Heathrow (LHR). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 1 May 2024.

Popular in

June

Cheapest in

February

Round-trip from

C$ 759

One-way from

C$ 476
High demand for flights, 24% potential price rise
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Best time to find cheap flights, 23% potential price drop
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From Seattle/Tacoma Intl to London Heathrow
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One-way flight from Seattle/Tacoma Intl to London Heathrow
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What is the cheapest day to fly round-trip from Seattle to London Heathrow Airport?

Users have found that flying from Seattle to London Heathrow Airport on a Tuesday typically leans towards higher prices. However, this doesn’t mean you still can’t find a deal. Flexibility with other aspects of your flight can still land a great price for your trip.

How far in advance should I book a flight from Seattle to London Heathrow Airport?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 59 days in advance, which can save you up to 39% on flights from Seattle to London Heathrow Airport compared to booking the week you need them. Waiting 59 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at C$ 1,188. For sooner than that we have options available in the next 3 days from C$ 1,569.

What is the cheapest month to fly from Seattle to London Heathrow Airport?

January is one of the best times of the year to fly to London Heathrow Airport from Seattle. Prices for January average C$ 1,180 per person but you can even find prices for as low as C$ 634. The most expensive prices can be found in the month of June. Opting for a January flight can save you 32% on your journey compared to booking in June

When is the cheapest time to fly from Seattle to London Heathrow Airport (SEA - LHR)?

Unlike in the morning, when flights are generally more expensive, you can save up to 27% on flights from Seattle to London Heathrow Airport by exploring options for tickets in the evening.

Cheap KLM flights from Seattle to Heathrow

Explore cheap flight options specifically provided by KLM for the route between Seattle and Heathrow. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 483,025 searches. Data last updated 1 May 2024.
Peruse some of the lowest-priced KLM flights we've found from Seattle to London. It's recommended that users confirm their flight details before booking.
Tue 24/99:15 p.m.SEA - LHR
Nonstop9h 35mKLM
Wed 9/109:55 a.m.LHR - SEA
1 stop14h 55mKLM
Deal found 1/5C$ 892
Mon 7/109:10 p.m.SEA - LHR
Nonstop9h 40mKLM
Fri 25/104:50 p.m.LHR - SEA
Nonstop10h 25mKLM
Deal found 30/4C$ 897
Mon 23/99:15 p.m.SEA - LHR
Nonstop9h 35mKLM
Mon 21/104:50 p.m.LHR - SEA
Nonstop10h 25mKLM
Deal found 30/4C$ 966
Fri 4/101:35 p.m.SEA - LHR
1 stop12h 25mKLM
Fri 11/104:50 p.m.LHR - SEA
Nonstop10h 25mKLM
Deal found 29/4C$ 971
Thu 3/109:10 p.m.SEA - LHR
Nonstop9h 40mKLM
Wed 30/109:10 a.m.LHR - SEA
1 stop14h 50mKLM
Deal found 30/4C$ 980
Tue 20/89:15 p.m.SEA - LHR
Nonstop9h 35mKLM
Wed 4/94:50 p.m.LHR - SEA
Nonstop10h 30mKLM
Deal found 1/5C$ 1,007
Sat 21/99:15 p.m.SEA - LHR
Nonstop9h 35mKLM
Sat 28/94:50 p.m.LHR - SEA
Nonstop10h 30mKLM
Deal found 30/4C$ 1,034
Thu 15/89:15 p.m.SEA - LHR
Nonstop9h 35mKLM
Wed 28/89:55 a.m.LHR - SEA
1 stop14h 40mKLM
Deal found 30/4C$ 1,052
Tue 6/89:15 p.m.SEA - LHR
Nonstop9h 35mKLM
Sat 31/84:50 p.m.LHR - SEA
Nonstop10h 25mKLM
Deal found 30/4C$ 1,059

  • KLM is one of the most popular airlines used for those travelling from Seattle to London Heathrow Airport. Seattle to London Heathrow Airport flights are typically 114% more expensive than other airlines travelling the same route. Flights from KLM typically cost C$ 784.79 RT. The cheapest KLM flight found for this route was C$ 659. The most popular departure airport in Seattle when flying to London Heathrow Airport is Seattle/Tacoma Intl Airport. The most popular airport to fly into when visiting London Heathrow Airport is London Heathrow Airport. When flying from Seattle to London Heathrow Airport, KLM flights are 8% more popular than any other airline flying that same route.

Cheap SWISS flights from Seattle to Heathrow

Explore cheap flight options specifically provided by SWISS for the route between Seattle and Heathrow. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 483,025 searches. Data last updated 1 May 2024.
Take a gander at the lowest prices we've found on SWISS flights from Seattle to London. If these deals don't fit your criteria, make sure to check back soon as new deals are always added.
Mon 30/91:10 p.m.SEA - LHR
2 stops19h 10mSWISS
Wed 9/106:40 p.m.LHR - SEA
2 stops31h 46mSWISS
Deal found 30/4C$ 899
Sun 13/101:10 p.m.SEA - LHR
2 stops20h 45mSWISS
Mon 21/1012:05 p.m.LHR - SEA
2 stops38h 21mSWISS
Deal found 1/5C$ 900
Tue 24/912:55 p.m.SEA - LHR
2 stops35h 00mSWISS
Mon 30/98:05 p.m.LHR - SEA
2 stops30h 21mSWISS
Deal found 30/4C$ 905
Tue 22/101:10 p.m.SEA - LHR
2 stops15h 50mSWISS
Mon 28/105:10 p.m.LHR - SEA
2 stops35h 19mSWISS
Deal found 30/4C$ 912
Wed 9/104:26 p.m.SEA - LHR
2 stops17h 29mSWISS
Tue 12/118:05 p.m.LHR - SEA
2 stops34h 24mSWISS
Deal found 29/4C$ 982
Wed 25/912:55 p.m.SEA - LHR
2 stops21h 00mSWISS
Tue 1/106:40 p.m.LHR - SEA
2 stops35h 20mSWISS
Deal found 1/5C$ 984
Thu 9/52:50 p.m.SEA - LHR
2 stops38h 10mSWISS
Wed 15/58:05 p.m.LHR - SEA
2 stops34h 22mSWISS
Deal found 30/4C$ 1,384
Mon 6/52:50 p.m.SEA - LHR
2 stops19h 05mSWISS
Mon 20/56:00 a.m.LHR - SEA
2 stops20h 27mSWISS
Deal found 30/4C$ 1,405

  • SWISS is one of the most popular airlines used for those travelling from Seattle to London Heathrow Airport. Flights from SWISS travelling this route typically cost C$ 697.47 RT. This price is typically 129% more expensive than other airlines that offer Seattle to London Heathrow Airport flights. When booking this route, the cheapest RT price found was C$ 603. The most popular departure airport in Seattle when flying to London Heathrow Airport is Seattle/Tacoma Intl Airport. The most popular airport to fly into when visiting London Heathrow Airport is London Heathrow Airport. When flying from Seattle to London Heathrow Airport, SWISS flights are 4% more popular than any other airline flying that same route.

Cheap Seattle to Heathrow flights in May & June 2024

Find cheap flight options from Seattle to Heathrow specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 483,025 searches. Prices were last updated on 1 May 2024.
These are some of the best deals we've found on flights to London in 2024 at this time. If these deals don't appeal to you, be sure to come back soon for more options.
Wed 15/59:10 p.m.SEA - LHR
Nonstop9h 40mDelta
Wed 22/58:40 a.m.LHR - SEA
1 stop16h 00mDelta
Deal found 1/5C$ 1,092
Wed 15/51:30 p.m.SEA - LHR
1 stop12h 30mDelta
Wed 22/511:45 a.m.LHR - SEA
1 stop12h 55mDelta
Deal found 1/5C$ 1,097
Wed 15/59:10 p.m.SEA - LHR
Nonstop9h 40mDelta
Wed 22/54:50 p.m.LHR - SEA
Nonstop10h 30mDelta
Deal found 1/5C$ 1,099
Wed 1/57:35 p.m.SEA - LHR
Nonstop9h 40mDelta
Wed 15/59:00 a.m.LHR - SEA
1 stop16h 40mDelta
Deal found 1/5C$ 1,100
Wed 15/54:30 p.m.SEA - LHR
Nonstop9h 20mDelta
Mon 20/55:35 p.m.LHR - SEA
1 stop25h 45mDelta
Deal found 1/5C$ 1,106
Wed 1/51:40 p.m.SEA - LHR
1 stop13h 40mDelta
Wed 15/59:00 a.m.LHR - SEA
1 stop16h 40mDelta
Deal found 1/5C$ 1,107
Wed 1/57:35 p.m.SEA - LHR
Nonstop9h 40mKLM
Wed 22/54:50 p.m.LHR - SEA
Nonstop10h 30mKLM
Deal found 1/5C$ 1,110
Wed 1/54:30 p.m.SEA - LHR
1 stop13h 40mUnited Airlines
Wed 15/59:00 a.m.LHR - SEA
2 stops22h 02mUnited Airlines
Deal found 1/5C$ 1,111
Wed 15/57:20 a.m.SEA - LHR
1 stop18h 40mDelta
Mon 20/55:35 p.m.LHR - SEA
1 stop25h 45mDelta
Deal found 1/5C$ 1,113

Seattle to Heathrow 2024 flight deals

Discover exclusive flight deals for travel between Seattle and Heathrow in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 483,025 searches. Data last updated 1 May 2024.
These are some of the best deals we've found on flights to London in 2024 at this time. If these deals don't appeal to you, be sure to come back soon for more options.
Sun 6/103:50 p.m.SEA - LHR
1 stop12h 05mIcelandair
Thu 31/108:25 p.m.LHR - SEA
1 stop28h 35mIcelandair
Deal found 1/5C$ 793
Wed 2/1010:40 a.m.SEA - LHR
2 stops17h 10mLufthansa
Wed 9/107:25 a.m.LHR - SEA
2 stops37h 05mLufthansa
Deal found 1/5C$ 879
Wed 6/112:35 p.m.SEA - LHR
1 stop20h 45mIcelandair
Fri 15/1112:15 p.m.LHR - SEA
1 stop12h 45mIcelandair
Deal found 1/5C$ 886
Wed 20/113:20 p.m.SEA - LHR
Nonstop9h 25mDelta
Thu 28/116:20 a.m.LHR - SEA
1 stop14h 00mDelta
Deal found 1/5C$ 888
Mon 23/94:30 p.m.SEA - LHR
Nonstop9h 20mDelta
Tue 22/106:15 a.m.LHR - SEA
1 stop13h 05mDelta
Deal found 1/5C$ 889
Wed 2/109:10 p.m.SEA - LHR
Nonstop9h 40mDelta
Wed 16/1011:45 a.m.LHR - SEA
1 stop13h 05mDelta
Deal found 1/5C$ 890
Tue 24/99:15 p.m.SEA - LHR
Nonstop9h 35mDelta
Wed 9/108:40 a.m.LHR - SEA
1 stop16h 10mDelta
Deal found 1/5C$ 892
Wed 9/1010:40 a.m.SEA - LHR
2 stops17h 10mLufthansa
Tue 12/118:45 a.m.LHR - SEA
2 stops23h 23mLufthansa
Deal found 1/5C$ 893
Mon 18/111:35 p.m.SEA - LHR
1 stop12h 25mDelta
Tue 26/116:20 a.m.LHR - SEA
1 stop14h 00mDelta
Deal found 1/5C$ 894

Direct flights to Heathrow from Seattle

Discover non-stop flight options from Seattle to Heathrow. Find direct flights with no layovers, providing a convenient travel experience. Explore non-stop flight options based on user searches, and compare prices and availability for your desired travel dates. Over the last 7 days, Cheapflights users made 483,025 searches. Data last updated 1 May 2024.
To help reduce your travel time, choose from one of these non-stop flights from Seattle to London. Those looking to potentially save on 1 or 2-stop flights from Seattle to London should utilize the search form at the top of the page.
Sun 6/107:40 p.m.SEA - LHR
Nonstop9h 20mBritish Airways
Thu 31/102:50 p.m.LHR - SEA
Nonstop9h 55mBritish Airways
Deal found 1/5C$ 894
Tue 24/99:15 p.m.SEA - LHR
Nonstop9h 35mKLM
Wed 2/104:50 p.m.LHR - SEA
Nonstop10h 25mKLM
Deal found 1/5C$ 897
Tue 1/109:10 p.m.SEA - LHR
Nonstop9h 40mKLM
Sun 13/104:50 p.m.LHR - SEA
Nonstop10h 25mKLM
Deal found 1/5C$ 962
Fri 25/101:30 p.m.SEA - LHR
Nonstop9h 20mFinnair
Tue 5/119:25 a.m.LHR - SEA
Nonstop10h 00mFinnair
Deal found 1/5C$ 966
Mon 19/89:15 p.m.SEA - LHR
Nonstop9h 35mKLM
Thu 29/84:50 p.m.LHR - SEA
Nonstop10h 25mKLM
Deal found 1/5C$ 990
Tue 20/89:15 p.m.SEA - LHR
Nonstop9h 35mKLM
Wed 4/94:50 p.m.LHR - SEA
Nonstop10h 30mKLM
Deal found 1/5C$ 1,007
Tue 10/94:30 p.m.SEA - LHR
Nonstop9h 20mDelta
Thu 19/912:45 p.m.LHR - SEA
Nonstop9h 55mDelta
Deal found 1/5C$ 1,011
Fri 25/101:30 p.m.SEA - LHR
Nonstop9h 20mBritish Airways
Sun 3/112:50 p.m.LHR - SEA
Nonstop9h 55mBritish Airways
Deal found 1/5C$ 1,034
Wed 21/89:15 p.m.SEA - LHR
Nonstop9h 35mDelta
Sat 31/812:45 p.m.LHR - SEA
Nonstop9h 55mDelta
Deal found 1/5C$ 1,059

Seattle to Heathrow flights leaving soon

Find last-minute flight options from Seattle to Heathrow for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 483,025 searches. Data last updated 1 May 2024.
Have a look at some of the flights available from Seattle to London departing last-minute. It's wise to confirm all flight details are correct before booking.
Tue 7/51:40 p.m.SEA - LHR
2 stops18h 20mMultiple Airlines
Wed 15/56:40 a.m.LHR - SEA
2 stops21h 58mMultiple Airlines
Deal found 30/4C$ 1,113
Wed 8/51:40 p.m.SEA - LHR
2 stops18h 20mMultiple Airlines
Wed 22/56:40 a.m.LHR - SEA
2 stops21h 58mMultiple Airlines
Deal found 1/5C$ 1,114
Wed 8/51:40 p.m.SEA - LHR
2 stops20h 00mMultiple Airlines
Thu 16/56:40 a.m.LHR - SEA
2 stops20h 05mMultiple Airlines
Deal found 30/4C$ 1,143
Tue 7/51:40 p.m.SEA - LHR
2 stops21h 50mMultiple Airlines
Wed 15/56:40 a.m.LHR - SEA
2 stops21h 58mMultiple Airlines
Deal found 1/5C$ 1,155
Tue 7/51:40 p.m.SEA - LHR
2 stops21h 50mMultiple Airlines
Tue 21/56:40 a.m.LHR - SEA
2 stops21h 51mMultiple Airlines
Deal found 30/4C$ 1,239
Tue 7/51:40 p.m.SEA - LHR
2 stops18h 20mMultiple Airlines
Sat 18/56:40 a.m.LHR - SEA
2 stops23h 06mMultiple Airlines
Deal found 30/4C$ 1,252
Wed 8/59:10 p.m.SEA - LHR
Nonstop9h 40mDelta
Thu 16/511:30 a.m.LHR - SEA
1 stop14h 10mDelta
Deal found 30/4C$ 1,284
Wed 8/59:10 p.m.SEA - LHR
Nonstop9h 40mKLM
Fri 17/511:45 a.m.LHR - SEA
1 stop12h 55mKLM
Deal found 30/4C$ 1,285
Mon 6/512:40 a.m.SEA - LHR
1 stop22h 35mDelta
Wed 15/56:15 a.m.LHR - SEA
1 stop19h 25mDelta
Deal found 30/4C$ 1,290

One-way flights to Heathrow from Seattle

Search for one-way flight options from Seattle to Heathrow. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 483,025 searches. Data last updated 1 May 2024.
Some of the best available deals we've found on one-way flights from Seattle to London. Those seeking round-trip flights from Seattle to London should utilize the search form at the top of the page.
Tue 17/96:55 p.m.SEA - LHR
1 stop33h 00mIcelandair
Deal found 1/5C$ 476
Sun 22/99:15 p.m.SEA - LHR
Nonstop9h 35mKLM
Deal found 1/5C$ 649
Sat 21/912:30 a.m.SEA - LHR
1 stop22h 45mDelta
Deal found 1/5C$ 654
Tue 17/93:50 p.m.SEA - LHR
3 stops19h 05mMultiple Airlines
Deal found 1/5C$ 686
Thu 19/99:15 p.m.SEA - LHR
Nonstop9h 35mKLM
Deal found 1/5C$ 717
Thu 26/912:30 a.m.SEA - LHR
1 stop22h 45mDelta
Deal found 1/5C$ 723
Wed 11/99:59 p.m.SEA - LHR
2 stops30h 06mWestJet
Deal found 1/5C$ 770
Wed 28/83:15 p.m.SEA - LHR
2 stops36h 50mWestJet
Deal found 1/5C$ 776
Tue 17/97:05 p.m.SEA - LHR
2 stops51h 25mLufthansa
Deal found 1/5C$ 794

Find flights from Seattle to Heathrow within your budget

Customize your flight search to find flights from Seattle to Heathrow that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 483,025 searches. Data last updated 1 May 2024.

Fly from

Any airport

Fly to

Any airport

Budget

C$ 878 - C$ 1,006

Route

Depart

Return

Price

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 9/10

2 stops17h 10m

London Heathrow

Tue 12/11

1 stop13h 55m

C$ 878

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 2/10

1 stop20h 20m

London Heathrow

Thu 10/10

2 stops17h 46m

C$ 881

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 6/10

Nonstop9h 20m

London Heathrow

Thu 24/10

1 stop13h 05m

C$ 888

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 24/9

Nonstop9h 35m

London Heathrow

Wed 9/10

1 stop14h 55m

C$ 892

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 30/9

2 stops19h 10m

London Heathrow

Wed 9/10

2 stops31h 46m

C$ 899

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Thu 3/10

1 stop12h 05m

London Heathrow

Wed 9/10

1 stop12h 50m

C$ 933

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 13/10

Nonstop9h 20m

London Heathrow

Mon 21/10

1 stop31h 50m

C$ 967

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 16/9

2 stops16h 40m

London Heathrow

Thu 17/10

2 stops17h 46m

C$ 989

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 11/8

1 stop21h 25m

London Heathrow

Tue 27/8

1 stop21h 28m

C$ 1,006

Flights are sorted by cheapest first

Deals found on 30/4

When is the best time to book a flight from Seattle to London Heathrow Airport?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Heathrow. Price data was last updated on 28 January 2024.
The best time to book flights from Seattle to London Heathrow Airport is 62 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
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When is the cheapest time to fly from Seattle to London Heathrow Airport?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Heathrow. Price data was last updated on 28 April 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Seattle to London Heathrow Airport flight should consider departing on Saturday evenings when fares are most often at their lowest. Thursday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
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Average price of flights to Heathrow by month

Plan your trip from Seattle to Heathrow by taking into account the cheapest months to travel. The average price of a one-way flight from Seattle to Heathrow is currently C$ 694 while a round-trip flight costs C$ 926. Price data was last updated on 28 April 2024.

Currently, January is the cheapest month in which you can book a flight from Seattle to London Heathrow Airport (average of C$ 560). Flying from Seattle to London Heathrow Airport in July is currently the most expensive (average of C$ 938). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

January

C$ 768

February

C$ 837

March

C$ 936

April

C$ 918

May

C$ 986

June

C$ 1,096

July

C$ 1,287

August

C$ 1,117

September

C$ 993

October

C$ 921

November

C$ 904

December

C$ 986

Temperature and rainfall in Heathrow by month

Plan your trip to Heathrow by taking into account the average temperature and rainfall totals by month.

LON

Temperature

4 - 17 °C

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Heathrow. Reviews last updated 1 May 2024.
To help decide which airline to fly from Seattle to London, see what other customers have to say about KLM, SWISS and Air France. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.1
Very good
10,874 reviews
Check prices

Comfort

7.9

Crew

8.6

Entertainment

8.0

Boarding

8.2

Food

7.4

Overall

8.1

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Delta
8.1
Very good
10,874 reviews
Delta
8.1
Very good
10,874 reviews
Check prices

Comfort

7.9

Crew

8.6

Entertainment

8.0

Boarding

8.2

Food

7.4

Overall

8.1

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

KLM
7.9
Good
1,612 reviews
Delta
8.1
Very good
10,874 reviews
Check prices

Comfort

7.9

Crew

8.6

Entertainment

8.0

Boarding

8.2

Food

7.4

Overall

8.1

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

SWISS
7.8
Good
2,029 reviews
Delta
8.1
Very good
10,874 reviews
Check prices

Comfort

7.9

Crew

8.6

Entertainment

8.0

Boarding

8.2

Food

7.4

Overall

8.1

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Finnair
7.8
Good
1,379 reviews
Delta
8.1
Very good
10,874 reviews
Check prices

Comfort

7.9

Crew

8.6

Entertainment

8.0

Boarding

8.2

Food

7.4

Overall

8.1

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Virgin Atlantic
7.7
Good
744 reviews
Delta
8.1
Very good
10,874 reviews
Check prices

Comfort

7.9

Crew

8.6

Entertainment

8.0

Boarding

8.2

Food

7.4

Overall

8.1

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Seattle to London Heathrow?

    Seattle/Tacoma Intl (SEA) is the airport you will fly out of if you book a flight from Seattle to London Heathrow. You should not have trouble finding flights to London Heathrow from Seattle/Tacoma Intl; the airport handles an average of 19 outbound flights to London Heathrow per day. You should also have plenty of airline options to choose from since 7 airlines have flights from the Seattle airport to London Heathrow. It is only a 18.4 km journey to Seattle/Tacoma Intl (SEA) from Seattle’s city centre.

  • Can I find flights from Seattle to London Heathrow Airport for under C$ 900 on Cheapflights?

    Yes, there are multiple flights from Seattle to London Heathrow Airport for under C$ 900. The cheapest flight booked recently is on Lufthansa for just C$ 878, but on average you can expect to pay C$ 899.

  • Are there direct flights from Seattle to London Heathrow Airport for under C$ 900 on Cheapflights?

    Cheapflights has 20 direct flights from Seattle to London Heathrow Airport under C$ 900. A good price for a direct flight from Seattle to London Heathrow Airport is less than C$ 1,056.

  • Are there last-minute flights available from Seattle to London Heathrow Airport for under C$ 1,200?

    There are currently 20+ open flights from Seattle to London Heathrow Airport within the next 7 days for less than C$ 1,200.

  • What days are direct flights available from Seattle to London Heathrow Airport?

    You can find direct flights on the following days: Sunday, Wednesday, Friday, Saturday.

  • How many flights depart from Seattle to London Heathrow Airport on average per day?

    On average, you can expect to see 8 flights from Seattle to London Heathrow Airport a day.
    Afternoon (Noon - 6pm) - 100% of flight departures

  • How long is the flight from Seattle to London Heathrow Airport?

    There are many flights that can get you from Seattle to London Heathrow Airport in 9h 20m. Fly via Lufthansa, Delta, or KLM to get the fastest option. Airlines will cover a distance of 7744 km. Both multi-stop and direct flights can be found to your destination and back.

  • What are the cheapest airlines flying from Seattle to London Heathrow Airport round-trip?

    Flying on Lufthansa is currently your cheapest option to London Heathrow Airport, with prices starting at C$ 878. Additional round-trip tickets that might be worth considering are offered by Delta and KLM, with the lowest prices starting at C$ 888 and C$ 892, respectively. Users have found that Lufthansa is 28% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from Seattle to London Heathrow Airport one-way?

    One-way options have recently been found by users for as low as C$ 476 on Icelandair. Other airlines that offer cheap prices include KLM from C$ 649 and Delta from C$ 654 one-way.

  • What are the most popular airlines that fly from Seattle to London Heathrow Airport?

    When booking a flight from Seattle to London Heathrow Airport, you may want to consider flying on Air France, Finnair or British Airways as they are the most popular for this route.

  • What are the most reliable airlines from Seattle to London Heathrow Airport?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Seattle to London Heathrow Airport on time: Air France (78%), Delta (78%), KLM (78%).

  • What are the cheapest flights from Seattle to London Heathrow Airport?

    While on average a flight from Seattle to London Heathrow Airport is generally C$ 1,052, our data shows the cheapest flight currently is C$ 669. When looking at the most popular route, (Seattle/Tacoma Intl - London Heathrow), you can expect to pay C$ 937 for that flight.

  • What does SEA to LHR mean?

    Seattle/Tacoma Intl Airport is SEA and London Heathrow Airport is LHR. These codes are created by the International Air Transport Association (IATA) and airlines use them to identify the departing and arrival airports in the flight routes they service.

  • Can I find deals for flights from Seattle to Heathrow that include extra baggage allowance?

    The amount of baggage you can bring on your Seattle to Heathrow flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Seattle to Heathrow with specific airlines?

    Yes, Cheapflights allows you to browse and filter Seattle to Heathrow flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from Seattle to Heathrow that include hotel bookings?

    Yes. In addition to deals on Seattle to Heathrow flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Heathrow.

  • Can I find deals for business class flights from Seattle to Heathrow?

    Yes. Cheapflights offers flight deals from Seattle to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Seattle to Heathrow that allow pets onboard?

    Many airlines flying from Seattle to Heathrow offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Seattle to Heathrow?

    Yes, you can often find last-minute deals on Seattle to Heathrow flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Seattle to London Heathrow Airport flight deals updated?

    The Seattle to London Heathrow Airport flight deals you see on this page were last updated on 1/5.

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Alternative routes for Seattle to Heathrow
See prices for flight routes from nearby airports that may be better suited for you.

Seattle to Gatwick flights

Top 7 airlines flying from Seattle to Heathrow

Discover the top 7 airlines that operate flights from Seattle to Heathrow. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 483,025 searches. Data last updated 1 May 2024.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapestC$ 669AverageC$ 1,119FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapestC$ 705AverageC$ 1,078FlexibilityNo cancel feeOn-time77%
Search Air France flights
IberiaCheapestC$ 747AverageC$ 1,073FlexibilityNo cancel feeOn-time77%
Search Iberia flights
FinnairCheapestC$ 828AverageC$ 957FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Virgin AtlanticCheapestC$ 865AverageC$ 1,165FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
DeltaCheapestC$ 904AverageC$ 1,077FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
British AirwaysCheapestC$ 956AverageC$ 1,317FlexibilityNo cancel feeOn-time70%
Search British Airways flights
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Search flights from Seattle to Heathrow by cabin class

Find flights from Seattle to Heathrow, based on your preferred cabin class, be it economy, premium economy, business, or first class.
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Hourly flight availability from Seattle to Heathrow

Find hourly flight availability from Seattle to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 1 May 2024.
0%of flight departuresEarly morningMidnight to 6 am
0%of flight departuresMorning6 am to noon
40%of flight departuresAfternoonNoon to 6 pm
60%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Weekly flight availability from Seattle to Heathrow

Explore weekly flight availability from Seattle to Heathrow. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 1 May 2024.
Sunday20daily flights
Monday20daily flights
Tuesday15daily flights
Wednesday20daily flights
Thursday20daily flights
Friday20daily flights
Saturday20daily flights

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Fly with Cheapflights

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How does Cheapflights help users find flights from Seattle to Heathrow?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Heathrow from Seattle today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from Seattle to Heathrow?

Millions of users choose and trust Cheapflights to book the best flight deals from Seattle to Heathrow for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Seattle to Heathrow with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Seattle to Heathrow flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Seattle to Heathrow become cheaper?

Yes, Cheapflights offers price alerts on Seattle to Heathrow flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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