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Cheap flights from Seattle to London from C$ 448

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 21/2. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LON
24 Dec — 31 Dec1
1 adult

The best prices from Seattle/Tacoma Intl to London are usually found in October or January, booked 46 days in advance, depart on a Wednesday or Tuesday and return on a Monday

Cheap flight deals from Seattle to London

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to London (LON). 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 19 December 2024.

Round-trip from

C$ 870

One-way from

C$ 448

Popular in

June

Cheapest in

October

Average price

C$ 1,434
Icelandair
  • Icelandair
  • 12/1-21/1
  • 2 total stops
  • 25h 25m total
  • Seattle to London
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WestJet
  • WestJet
  • 21/2
  • 1 total stop
  • 13h 35m total
  • Seattle to London
Search Deals
High demand for flights, 21% potential price rise
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Best time to find cheap flights, 4% potential price drop
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Average for round-trip flights in December 2024
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Find flight deals from Seattle to London

Cheapest flights from Seattle to London
Explore the most affordable flight options available from Seattle to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 19 December 2024.

Sat 28/122:35 p.m.SEA - LHR
1 stop12h 15mIcelandair
Sun 2/212:15 p.m.LHR - SEA
1 stop12h 45mIcelandair
Deal found 19/12C$ 1,195
Sun 29/1210:35 a.m.SEA - LHR
1 stop15h 35mLufthansa
Fri 10/11:00 p.m.LHR - SEA
1 stop13h 25mLufthansa
Deal found 19/12C$ 1,202
Mon 30/126:13 p.m.SEA - LHR
1 stop29h 12mUnited Airlines
Wed 8/11:00 p.m.LHR - SEA
1 stop28h 50mUnited Airlines
Deal found 19/12C$ 1,390
Sun 29/126:55 p.m.SEA - LHR
Nonstop9h 45mKLM
Wed 8/13:50 p.m.LHR - SEA
Nonstop10h 30mKLM
Deal found 19/12C$ 1,413
Wed 25/126:55 p.m.SEA - LHR
Nonstop9h 45mVirgin Atlantic
Thu 30/16:30 a.m.LHR - SEA
1 stop13h 21mVirgin Atlantic
Deal found 19/12C$ 1,430
Tue 24/126:50 p.m.SEA - LHR
Nonstop9h 25mBritish Airways
Fri 31/19:25 a.m.LHR - SEA
Nonstop9h 55mBritish Airways
Deal found 19/12C$ 1,470
Mon 30/125:45 p.m.SEA - LHR
Nonstop9h 25mAir France
Wed 8/13:50 p.m.LHR - SEA
Nonstop10h 30mAir France
Deal found 19/12C$ 1,487
Sat 28/126:50 p.m.SEA - LHR
Nonstop9h 25mFinnair
Tue 28/13:00 p.m.LHR - SEA
Nonstop9h 55mFinnair
Deal found 19/12C$ 1,521
Mon 23/123:22 p.m.SEA - LHR
1 stop34h 18mMultiple Airlines
Sat 11/16:30 a.m.LHR - SEA
1 stop13h 40mMultiple Airlines
Deal found 19/12C$ 1,636
Mon 30/127:40 a.m.SEA - LHR
2 stops17h 40mScandinavian Airlines
Fri 10/16:40 a.m.LHR - SEA
2 stops23h 45mScandinavian Airlines
Deal found 19/12C$ 1,744
Sun 29/125:45 a.m.SEA - LGW
1 stop20h 50mMultiple Airlines
Tue 7/112:00 p.m.LGW - SEA
1 stop33h 11mMultiple Airlines
Deal found 19/12C$ 1,902
Tue 31/127:00 p.m.SEA - LGW
1 stop18h 30mTurkish Airlines
Wed 8/14:55 p.m.LGW - SEA
1 stop32h 10mTurkish Airlines
Deal found 19/12C$ 2,112

Find flights from Seattle to London within your budget

Customize your flight search to find flights from Seattle to London 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 629,999 searches. Data last updated 19 December 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sun 12/1

2:35 p.m.-10:55 a.m.

1 stop12h 20m

London Gatwick

Fri 24/1

11:55 a.m.-5:00 p.m.

1 stop13h 05m

C$ 870

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 13/1

2:35 p.m.-7:30 p.m.

1 stop20h 55m

London Heathrow

Sat 18/1

12:15 p.m.-5:00 p.m.

1 stop12h 45m

C$ 878

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sun 2/2

2:35 p.m.-10:55 a.m.

1 stop12h 20m

London Gatwick

Wed 5/2

8:15 a.m.-2:21 p.m.

2 stops38h 06m

C$ 899

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Thu 20/2

3:15 p.m.-12:50 p.m.

1 stop13h 35m

London Heathrow

Wed 26/2

2:50 p.m.-2:21 p.m.

1 stop31h 31m

C$ 939

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 20/4

8:20 p.m.-1:40 p.m.

Nonstop9h 20m

London Heathrow

Wed 7/5

7:30 a.m.-4:00 p.m.

1 stop16h 30m

C$ 940

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 19/2

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

1 stop15h 35m

London Heathrow

Wed 26/2

9:30 a.m.-9:30 p.m.

2 stops20h 00m

C$ 960

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 19/2

8:10 a.m.-6:40 a.m.

1 stop14h 30m

London Heathrow

Wed 26/2

6:30 a.m.-12:10 p.m.

1 stop13h 40m

C$ 969

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 22/1

7:04 p.m.-12:40 p.m.

Nonstop9h 36m

London Heathrow

Wed 29/1

6:30 a.m.-11:51 a.m.

1 stop13h 21m

C$ 972

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 15/1

7:04 p.m.-12:40 p.m.

Nonstop9h 36m

London Heathrow

Wed 22/1

6:30 a.m.-11:51 a.m.

1 stop13h 21m

C$ 973

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 19/1

1:35 p.m.-11:40 a.m.

1 stop14h 05m

London Heathrow

Tue 4/2

9:25 a.m.-11:20 a.m.

Nonstop9h 55m

C$ 998

Flights are sorted by cheapest round-trip flights first.

Deals found on 19/12

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Best time to book a flight from Seattle to London

Have a flexible travel schedule? Discover the best time to fly to London 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 London

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

How far ahead should I book a flight from Seattle to London?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to London. Price data was last updated on 13 December 2024.

The price you pay for your flight from Seattle to London may vary depending on when you book. For the best chance of a lower fare, look to book 46 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, January is the cheapest month in which you can book a flight from Seattle to London (average of C$ 560). Flying from Seattle to London in July is currently the most expensive (average of C$ 874). 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 LON?

Find hourly flight availability from Seattle to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 19 December 2024.

It’s optimal to fly from Seattle to London in the morning. By choosing this option you can save up to 15% on the cost of your flight, compared to a flight at noon.

Weekly flight availability from Seattle to London

Explore weekly flight availability from Seattle to London. 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 19 December 2024.

The most flights from SEA to LON are scheduled on a Tuesday (18 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (12 on average).

Rainfall in London by month

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

In terms of precipitation, rainfall in London 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 when rainfall is around 40.0 mm.

Temperature in London by month

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

If weather is an important factor for your trip to London, 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 London

Get insights into the airlines that provide service to London. 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 London. Reviews last updated 19 December 2024.
To help decide which airline to fly from Seattle to London, see what other customers have to say about WestJet, Finnair and United Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
8,600 reviews
Check prices

Food

7.3

Crew

8.6

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta
8.0
Very good
8,600 reviews
Delta
8.0
Very good
8,600 reviews
Check prices

Food

7.3

Crew

8.6

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Alaska Airlines
8.0
Very good
9,551 reviews
Delta
8.0
Very good
8,600 reviews
Check prices

Food

7.3

Crew

8.6

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

KLM
7.8
Good
1,349 reviews
Delta
8.0
Very good
8,600 reviews
Check prices

Food

7.3

Crew

8.6

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Finnair
7.7
Good
1,285 reviews
Delta
8.0
Very good
8,600 reviews
Check prices

Food

7.3

Crew

8.6

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

SWISS
7.6
Good
1,605 reviews
Delta
8.0
Very good
8,600 reviews
Check prices

Food

7.3

Crew

8.6

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

Find useful and relevant information for your journey from Seattle to London. 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?

    Most people fly from Seattle/Tacoma Intl (SEA) if they book a flight from Seattle to London. On average, Seattle/Tacoma Intl has 14 outbound flights to London per day from 7 airlines. Seattle/Tacoma Intl is conveniently located just 18.4 km from Seattle’s city centre.

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

    According to our current data, Icelandair (C$ 870), WestJet (C$ 939), and Finnair (C$ 940) offers the cheapest pricing from Seattle to London. These flights start at 26% lower than the current average price 3 months from now.

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

    C$ 448 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on Delta and Virgin Atlantic, with prices starting from C$ 602 and C$ 608, respectively.

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

    The top 3 most reliable airlines when flying from Seattle to London are KLM (89%), Singapore Airlines (86%) and Air France (84%).

  • What are the cheapest flights from Seattle to London?

    Looking at all options, your cheapest flight can be booked for C$ 617. While the most popular route (Seattle/Tacoma Intl - London Gatwick) can be booked for C$ 896 on average our data indicates C$ 1,573 when flying from Seattle to London.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Seattle to London 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?

    Currently, January is the cheapest month in which you can book a flight from Seattle to London (average of C$ 560). Flying from Seattle to London in July is currently the most expensive (average of C$ 874). 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 London

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

Top 7 airlines flying from Seattle to London

Discover the top 7 airlines that operate flights from Seattle to London. 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 629,999 searches. Data last updated 19 December 2024.
AirlineCheapestAverageFlexibilityOn-time
IberiaCheapestC$ 634AverageC$ 941FlexibilityNo cancel feeOn-time77%
Search Iberia flights
IcelandairCheapestC$ 635AverageC$ 1,006FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapestC$ 740AverageC$ 1,132FlexibilityNo cancel feeOn-time77%
Search Air France flights
KLMCheapestC$ 740AverageC$ 936FlexibilityNo cancel feeOn-time75%
Search KLM flights
Virgin AtlanticCheapestC$ 844AverageC$ 1,085FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
DeltaCheapestC$ 880AverageC$ 1,013FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
British AirwaysCheapestC$ 890AverageC$ 1,173FlexibilityNo cancel feeOn-time70%
Search British Airways flights

Fly with Cheapflights

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

Cheapflights helps you search for flights from Seattle to London via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Seattle to London for you. Better yet — we are completely free to use.

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

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

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

Yes! Start tracking prices for Seattle to London flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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