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$507+ Cheap flights from London (LON) to Seattle (SEA)

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 1/31. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SEA
Jan 28 — Feb 41
Tue 1/28
Tue 2/4
1 adult, Economy
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Find cheap flights from London to Seattle with Cheapflights

1. Tell us where you want to go
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The best prices from London to Seattle/Tacoma Intl are usually found in February or January, booked 69 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

Cheap flight deals from London to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from London (LON) to Seattle (SEA). 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 January 23, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$529
(Delta)

One-way from

$507
(Mytrip)

Popular in

August

Cheapest in

February

Average price

$637

Good round-trip deal

$632 or less

Good one-way deal

$599 or less
Provider with most accurate pricing for London (LON)-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for London (LON)-Seattle/Tacoma Intl flights.
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From London (LON) to Seattle/Tacoma Intl
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One-way flight from London (LON) to Seattle/Tacoma Intl
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Highest demand for flights based on searches. 15% potential increase in price ($143 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($23 potential savings vs. average RT price).
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Average for round-trip flights in January 2025
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Price to beat on a round-trip flight from London (LON) to Seattle/Tacoma Intl.
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Price to beat on a one-way flight from London (LON) to Seattle/Tacoma Intl.
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Find flight deals from London to Seattle

Cheapest flights from London to Seattle
Explore the most affordable flight options available from London to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 23, 2025.

This United Airlines deal was found by Cheapflights users on 1/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/91:30 pmLHR - SEA
1 stop30h 40mUnited Airlines
Sun 3/1611:57 pmSEA - LHR
1 stop24h 33mUnited Airlines
Deal found 1/23$528
This Delta deal was found by Cheapflights users on 1/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/186:30 amLHR - SEA
1 stop13h 16mDelta
Wed 2/265:45 pmSEA - LHR
Nonstop9h 25mDelta
Deal found 1/22$529
This Air Canada deal was found by Cheapflights users on 1/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/136:30 amLHR - SEA
2 stops18h 55mMultiple Airlines
Mon 3/245:45 amSEA - LHR
2 stops18h 25mMultiple Airlines
Deal found 1/22$532
This Air Canada deal was found by Cheapflights users on 1/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/283:00 pmLHR - SEA
2 stops31h 30mAir Canada
Tue 2/45:45 amSEA - LHR
2 stops17h 25mAir Canada
Deal found 1/22$533
This KLM deal was found by Cheapflights users on 1/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/193:50 pmLHR - SEA
Nonstop10h 21mKLM
Wed 2/267:05 pmSEA - LHR
Nonstop9h 35mKLM
Deal found 1/22$537
This SWISS deal was found by Cheapflights users on 1/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/119:15 amLCY - SEA
2 stops20h 05mSWISS
Mon 2/243:24 pmSEA - LCY
2 stops17h 41mSWISS
Deal found 1/22$542
This The Travel House deal was found by Cheapflights users on 1/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure The Travel House is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/77:40 amLHR - SEA
1 stop13h 40mLufthansa
Sun 2/911:17 pmSEA - LHR
1 stop13h 18mLufthansa
Deal found 1/23$543
This SWISS deal was found by Cheapflights users on 1/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/66:40 pmLGW - SEA
2 stops34h 35mSWISS
Thu 3/132:50 pmSEA - LGW
2 stops20h 00mSWISS
Deal found 1/21$544
This EaseMyTrip deal was found by Cheapflights users on 1/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure EaseMyTrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/123:40 pmLGW - SEA
1 stop13h 00mIcelandair
Tue 7/111:30 pmSEA - LGW
1 stop31h 10mIcelandair
Deal found 1/22$545
This American Airlines deal was found by Cheapflights users on 1/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/2811:15 amLHR - SEA
1 stop19h 28mAmerican Airlines
Tue 2/41:35 pmSEA - LHR
Nonstop9h 25mAmerican Airlines
Deal found 1/22$553
This Kiwi.com deal was found by Cheapflights users on 1/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/310:20 amLHR - SEA
1 stop13h 40mFinnair
Mon 12/87:42 amSEA - LHR
1 stop20h 23mFinnair
Deal found 1/22$560
This Voliamo deal was found by Cheapflights users on 1/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Voliamo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/1910:00 amLCY - SEA
2 stops42h 19mLufthansa
Wed 2/262:00 pmSEA - LCY
1 stop18h 40mLufthansa
Deal found 1/22$561

Find flights from London to Seattle within your budget

Customize your flight search to find flights from London to Seattle 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 2,558,603 searches. Data last updated January 23, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 3/9

1:30 pm-1:10 pm

1 stop30h 40m

Seattle/Tacoma Intl

Sun 3/16

11:57 pm-7:30 am

1 stop24h 33m

$528

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 2/18

6:30 am-11:46 am

1 stop13h 16m

Seattle/Tacoma Intl

Wed 2/26

5:45 pm-11:10 am

Nonstop9h 25m

$529

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 3/13

6:30 am-6:25 pm

2 stops18h 55m

Seattle/Tacoma Intl

Mon 3/24

5:45 am-7:10 am

2 stops18h 25m

$532

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 2/3

1:15 pm-3:15 pm

Nonstop10h 00m

Seattle/Tacoma Intl

Sun 2/9

10:55 pm-6:25 am

1 stop23h 30m

$533

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 2/19

3:50 pm-6:11 pm

Nonstop10h 21m

Seattle/Tacoma Intl

Wed 2/26

7:05 pm-12:40 pm

Nonstop9h 35m

$537

LondonSeattle

LCY - SEA

LCYSEA

London City

Tue 2/11

9:15 am-10:53 pm

2 stops21h 38m

Seattle/Tacoma Intl

Thu 2/27

3:24 pm-5:05 pm

2 stops17h 41m

$542

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 2/7

7:40 am-1:20 pm

1 stop13h 40m

Seattle/Tacoma Intl

Sun 2/9

11:17 pm-8:35 pm

1 stop13h 18m

$543

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Thu 3/6

6:40 pm-9:15 pm

2 stops34h 35m

Seattle/Tacoma Intl

Thu 3/13

2:50 pm-5:50 pm

2 stops20h 00m

$544

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Thu 6/12

3:40 pm-8:40 pm

1 stop13h 00m

Seattle/Tacoma Intl

Tue 7/1

11:30 pm-2:40 pm

1 stop31h 10m

$545

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 5/3

10:20 am-4:00 pm

1 stop13h 40m

Seattle/Tacoma Intl

Mon 12/8

7:42 am-12:05 pm

1 stop20h 23m

$560

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/22

Showing 1-10 of 59 results
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Compare providers for flights from London to Seattle

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from London to Seattle in January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*1 star
AranGrantPrice Accuracy3 starsTrust Score*3 stars
Thrive TravelPrice Accuracy3 starsTrust Score*1 star
MytripPrice Accuracy3 starsTrust Score*3 stars
Justfly.comPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy2 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on London-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on London-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from London-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on London-Seattle flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from London to Seattle

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

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

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

Use this chart to determine the optimal time to book a round-trip flight from London to Seattle. Price data was last updated on January 17, 2025.

To ensure you get the cheapest price possible for a flight from London to Seattle, you should look to book at least 69 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, January is the cheapest month in which you can book a flight from London to Seattle (average of $238). Flying from London to Seattle in July is currently the most expensive (average of $411). 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 LON to SEA?

Find hourly flight availability from London to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 23, 2025.

One of the essential ways to save on airfare from London to Seattle is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 8% on airfare.

What is the cheapest day to fly from London to Seattle?

Use this chart to determine the cheapest time to fly round-trip from London to Seattle. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their London to Seattle flight should consider departing on Monday evenings when fares are most often at their lowest. Saturday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from London to Seattle

Explore weekly flight availability from London to Seattle. 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 January 23, 2025.

The most flights from LON to SEA are scheduled on a Tuesday (17 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (6 on average).

Rainfall in Seattle by month

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

In terms of precipitation, rainfall in Seattle ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.

Temperature in Seattle by month

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

If weather is an important factor for your trip to Seattle, 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 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated January 23, 2025.
Peruse reviews from past customers who have flown with SWISS, Virgin Atlantic and Icelandair from London to Seattle to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
8,512 reviews

Boarding

8.2

Entertainment

7.9

Crew

8.6

Food

7.3

Overall

8.0

Comfort

8.0

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Delta
8.0
Very good
8,512 reviews
Delta
8.0
Very good
8,512 reviews

Boarding

8.2

Entertainment

7.9

Crew

8.6

Food

7.3

Overall

8.0

Comfort

8.0

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

KLM
7.8
Good
1,338 reviews
Delta
8.0
Very good
8,512 reviews

Boarding

8.2

Entertainment

7.9

Crew

8.6

Food

7.3

Overall

8.0

Comfort

8.0

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Finnair
7.6
Good
1,286 reviews
Delta
8.0
Very good
8,512 reviews

Boarding

8.2

Entertainment

7.9

Crew

8.6

Food

7.3

Overall

8.0

Comfort

8.0

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Austrian Airlines
7.5
Good
787 reviews
Delta
8.0
Very good
8,512 reviews

Boarding

8.2

Entertainment

7.9

Crew

8.6

Food

7.3

Overall

8.0

Comfort

8.0

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

SWISS
7.5
Good
1,598 reviews
Delta
8.0
Very good
8,512 reviews

Boarding

8.2

Entertainment

7.9

Crew

8.6

Food

7.3

Overall

8.0

Comfort

8.0

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

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

    Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly into when you book flights from London to Seattle. 8 airlines have flights to Seattle/Tacoma Intl from London on a regular basis. Booking flights from London to Seattle/Tacoma Intl should not be difficult; the airport handles an average of 12 inbound flights from London per day.

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

    Cheapflights users have booked flights from London to Seattle round-trip from $529. Other airlines that can offer you cheap pricing are United Airlines, from $530, and Air Canada, from $533. Delta is currently priced 30% below the average price you’ll pay for this route.

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

    One-way options have recently been found by users for as low as $513 on Aer Lingus. Other airlines that offer cheap prices include Icelandair from $514 and WestJet from $542 one-way.

  • What are the most popular routes from London to Seattle?

    Most travelers choose London Heathrow - Seattle/Tacoma Intl, London Gatwick - Seattle/Tacoma Intl or London City - Seattle/Tacoma Intl when deciding on the best route from London to Seattle.

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

    The top 3 most reliable airlines when flying from London to Seattle are KLM (75%), Air France (75%) and Delta (75%).

  • What are the cheapest flights from London to Seattle?

    While on average a flight from London to Seattle is generally $1,411, our data shows the cheapest flight currently is $553. When looking at the most popular route, (London Heathrow - Seattle/Tacoma Intl), you can expect to pay $447 for that flight.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from London to Seattle 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 London to Seattle?

    Currently, January is the cheapest month in which you can book a flight from London to Seattle (average of $238). Flying from London to Seattle in July is currently the most expensive (average of $411). 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

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
SeaTac
Tukwila
Renton
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Lacey
Federal Way
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Leavenworth
Olympia
Marysville
Centralia
Cle Elum
Mukilteo
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Issaquah
Shoreline
Lynnwood
Shelton
Silverdale

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Alternative routes for London to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
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Top 8 airlines flying from London to Seattle

Discover the top 8 airlines that operate flights from London to Seattle. 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 2,558,603 searches. Data last updated January 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$559Average$845FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$608Average$916FlexibilityNo cancel feeOn-time70%
Virgin AtlanticCheapest$614Average$1,017FlexibilityNo cancel feeOn-time72%
American AirlinesCheapest$621Average$759FlexibilityNo cancel feeOn-time71%
IberiaCheapest$656Average$975FlexibilityNo cancel feeOn-time77%
Aer LingusCheapest$671Average$988FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$674Average$844FlexibilityNo cancel feeOn-time75%
DeltaCheapest$675Average$872FlexibilityNo cancel feeOn-timeN/A
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