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Cheap flights from Seattle to London Heathrow Airport from C$ 332

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 22/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LHR
25 Nov — 2 Dec1
1 adult

The best prices from Seattle/Tacoma Intl to London Heathrow are usually found in November or October, booked 75 days in advance, depart on a Monday or Tuesday 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 20 November 2024.

Round-trip from

C$ 860

One-way from

C$ 332

Popular in

June

Cheapest in

November
Icelandair
  • Icelandair
  • 18/4-30/4
  • 2 total stops
  • 30h 00m total
  • Seattle to London
Search Deals
Icelandair
  • Icelandair
  • 22/1
  • 1 total stop
  • 12h 15m total
  • Seattle to London
Search Deals
High demand for flights, 31% potential price rise
Search Deals
Best time to find cheap flights, 16% potential price drop
Search Deals

Find flight deals from Seattle to Heathrow

Cheapest flights from Seattle to Heathrow
Explore the most affordable flight options available from Seattle to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 20 November 2024.

Sun 29/1210:35 a.m.SEA - LHR
1 stop15h 35mLufthansa
Tue 14/16:30 a.m.LHR - SEA
2 stops20h 00mLufthansa
Deal found 19/11C$ 885
Sun 29/127:15 p.m.SEA - LHR
1 stop30h 55mUnited Airlines
Tue 14/16:35 a.m.LHR - SEA
1 stop14h 45mUnited Airlines
Deal found 19/11C$ 903
Sun 29/126:55 p.m.SEA - LHR
Nonstop9h 45mKLM
Tue 14/16:30 a.m.LHR - SEA
1 stop13h 20mKLM
Deal found 20/11C$ 904
Sun 29/125:45 p.m.SEA - LHR
Nonstop9h 25mDelta
Tue 14/110:00 a.m.LHR - SEA
1 stop33h 50mDelta
Deal found 19/11C$ 907
Mon 25/111:23 p.m.SEA - LHR
2 stops18h 37mMultiple Airlines
Wed 11/126:40 a.m.LHR - SEA
2 stops22h 50mMultiple Airlines
Deal found 19/11C$ 969
Mon 16/122:35 p.m.SEA - LHR
1 stop12h 15mIcelandair
Sat 11/112:15 p.m.LHR - SEA
1 stop12h 45mIcelandair
Deal found 19/11C$ 1,021
Wed 11/129:40 a.m.SEA - LHR
2 stops22h 20mScandinavian Airlines
Wed 8/17:30 p.m.LHR - SEA
2 stops34h 55mScandinavian Airlines
Deal found 18/11C$ 1,100
Tue 3/125:45 p.m.SEA - LHR
Nonstop9h 25mVirgin Atlantic
Tue 10/126:20 a.m.LHR - SEA
1 stop13h 00mVirgin Atlantic
Deal found 19/11C$ 1,124
Tue 26/116:50 p.m.SEA - LHR
Nonstop9h 25mIberia
Wed 11/123:00 p.m.LHR - SEA
Nonstop9h 55mIberia
Deal found 18/11C$ 1,133
Tue 19/111:55 p.m.SEA - LHR
2 stops34h 10mSWISS
Tue 26/116:40 p.m.LHR - SEA
2 stops34h 27mSWISS
Deal found 19/11C$ 1,158
Tue 31/125:45 p.m.SEA - LHR
Nonstop9h 25mAir France
Tue 7/14:35 p.m.LHR - SEA
1 stop37h 50mAir France
Deal found 19/11C$ 1,180
Sun 15/126:05 a.m.SEA - LHR
1 stop16h 25mAir Canada
Tue 24/121:00 p.m.LHR - SEA
1 stop13h 25mAir Canada
Deal found 19/11C$ 1,207

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 645,034 searches. Data last updated 20 November 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 18/4

6:55 p.m.-8:20 p.m.

1 stop17h 25m

London Heathrow

Tue 29/4

1:05 p.m.-5:40 p.m.

1 stop12h 35m

C$ 860

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 29/12

10:35 a.m.-10:10 a.m.

1 stop15h 35m

London Heathrow

Tue 14/1

6:30 a.m.-6:30 p.m.

2 stops20h 00m

C$ 885

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 7/4

7:40 p.m.-1:00 p.m.

Nonstop9h 20m

London Heathrow

Wed 14/5

10:20 a.m.-4:00 p.m.

1 stop13h 40m

C$ 886

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 29/12

7:15 p.m.-10:10 a.m.

1 stop30h 55m

London Heathrow

Tue 14/1

6:35 a.m.-1:20 p.m.

1 stop14h 45m

C$ 903

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 29/12

6:55 p.m.-12:40 p.m.

Nonstop9h 45m

London Heathrow

Tue 14/1

6:30 a.m.-11:50 a.m.

1 stop13h 20m

C$ 904

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 29/12

5:45 p.m.-11:10 a.m.

Nonstop9h 25m

London Heathrow

Tue 14/1

10:00 a.m.-11:50 a.m.

1 stop33h 50m

C$ 907

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 7/1

5:45 p.m.-11:10 a.m.

Nonstop9h 25m

London Heathrow

Tue 14/1

1:15 p.m.-3:15 p.m.

Nonstop10h 00m

C$ 937

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 20/4

7:40 p.m.-1:00 p.m.

Nonstop9h 20m

London Heathrow

Wed 14/5

9:50 a.m.-11:35 a.m.

Nonstop9h 45m

C$ 942

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 22/1

7:30 a.m.-9:20 a.m.

2 stops17h 50m

London Heathrow

Sun 26/1

7:50 p.m.-6:50 p.m.

2 stops31h 00m

C$ 952

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 17/3

1:50 p.m.-4:00 p.m.

2 stops19h 10m

London Heathrow

Mon 31/3

6:40 a.m.-10:15 p.m.

2 stops23h 35m

C$ 1,002

Flights are sorted by cheapest round-trip flights first.

Deals found on 19/11

Showing 1-10 of 25 results
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Best time to book a flight from Seattle to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Travel insights for flights from Seattle to Heathrow

Get recent, data-driven insights about flights from Seattle to Heathrow including ideal travel times, pricing trends, and more.

How far ahead should I 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 15 November 2024.

The best time to book flights from Seattle to London Heathrow Airport is 75 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.

What is the cheapest month to book a flight from Seattle to London Heathrow Airport?

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$ 877). 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.

What is the cheapest time of day to fly from SEA to LHR?

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 20 November 2024.

Unlike at noon, when flights are generally more expensive, you can save up to 15% on flights from Seattle to London Heathrow Airport by exploring options for tickets in the morning.

Weekly flight availability from Seattle to London Heathrow Airport

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 20 November 2024.

The most flights from SEA to LHR are scheduled on a Tuesday (18 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (6 on average).

Rainfall in Heathrow by month

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

In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 mm per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

Temperature in Heathrow by month

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

If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 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 20 November 2024.
To help decide which airline to fly from Seattle to London, see what other customers have to say about Icelandair, Finnair and Virgin Atlantic. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
China Airlines
8.3
Very good
778 reviews
Check prices

Boarding

8.3

Entertainment

8.0

Comfort

8.0

Overall

8.3

Crew

8.6

Food

7.8

Reviews

1 / 10

Had a beer dropped in my lap which was a total accident, what I want impressed with was the fact that I had to ask for a towel to clean up my leg and the ground. From Taipei to Seattle

China Airlines
8.3
Very good
778 reviews
China Airlines
8.3
Very good
778 reviews
Check prices

Boarding

8.3

Entertainment

8.0

Comfort

8.0

Overall

8.3

Crew

8.6

Food

7.8

Reviews

1 / 10

Had a beer dropped in my lap which was a total accident, what I want impressed with was the fact that I had to ask for a towel to clean up my leg and the ground. From Taipei to Seattle

Delta
8.0
Very good
8,756 reviews
China Airlines
8.3
Very good
778 reviews
Check prices

Boarding

8.3

Entertainment

8.0

Comfort

8.0

Overall

8.3

Crew

8.6

Food

7.8

Reviews

1 / 10

Had a beer dropped in my lap which was a total accident, what I want impressed with was the fact that I had to ask for a towel to clean up my leg and the ground. From Taipei to Seattle

Alaska Airlines
8.0
Very good
9,461 reviews
China Airlines
8.3
Very good
778 reviews
Check prices

Boarding

8.3

Entertainment

8.0

Comfort

8.0

Overall

8.3

Crew

8.6

Food

7.8

Reviews

1 / 10

Had a beer dropped in my lap which was a total accident, what I want impressed with was the fact that I had to ask for a towel to clean up my leg and the ground. From Taipei to Seattle

KLM
7.8
Good
1,350 reviews
China Airlines
8.3
Very good
778 reviews
Check prices

Boarding

8.3

Entertainment

8.0

Comfort

8.0

Overall

8.3

Crew

8.6

Food

7.8

Reviews

1 / 10

Had a beer dropped in my lap which was a total accident, what I want impressed with was the fact that I had to ask for a towel to clean up my leg and the ground. From Taipei to Seattle

Finnair
7.7
Good
1,300 reviews
China Airlines
8.3
Very good
778 reviews
Check prices

Boarding

8.3

Entertainment

8.0

Comfort

8.0

Overall

8.3

Crew

8.6

Food

7.8

Reviews

1 / 10

Had a beer dropped in my lap which was a total accident, what I want impressed with was the fact that I had to ask for a towel to clean up my leg and the ground. From Taipei to Seattle

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 12 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.

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

    Flying on Icelandair is currently your cheapest option to London Heathrow Airport, with prices starting at C$ 860. Additional round-trip tickets that might be worth considering are offered by Lufthansa and Finnair, with the lowest prices starting at C$ 885 and C$ 886, respectively. Users have found that Icelandair is 25% 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$ 332 on Icelandair. Other airlines that offer cheap prices include WestJet from C$ 491 and Delta from C$ 571 one-way.

  • 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: KLM (76%), Air France (76%), Delta (76%).

  • 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$ 1,089, our data shows the cheapest flight currently is C$ 599. When looking at the most popular route, (Seattle/Tacoma Intl - London Heathrow), you can expect to pay C$ 1,676 for that flight.

  • 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.

  • What is the cheapest month to book a flight from Seattle to London Heathrow Airport?

    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$ 877). 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.

See more FAQs

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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 645,034 searches. Data last updated 20 November 2024.
AirlineCheapestAverageFlexibilityOn-time
IberiaCheapestC$ 617AverageC$ 915FlexibilityNo cancel feeOn-time77%
Search Iberia flights
IcelandairCheapestC$ 617AverageC$ 869FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapestC$ 719AverageC$ 1,100FlexibilityNo cancel feeOn-time77%
Search Air France flights
KLMCheapestC$ 720AverageC$ 910FlexibilityNo cancel feeOn-time75%
Search KLM flights
Virgin AtlanticCheapestC$ 820AverageC$ 1,057FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
DeltaCheapestC$ 856AverageC$ 985FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
British AirwaysCheapestC$ 865AverageC$ 1,116FlexibilityNo cancel feeOn-time70%
Search British Airways flights

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

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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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