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$481+ 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 4/23. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SEA
Mar 1 — Mar 81
Sat 3/1
Sat 3/8
1 adult, Economy
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The best prices from London to Seattle/Tacoma Intl are usually found in January or February, 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 February 24, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$525
(Mytrip)

One-way from

$481
(Kiwi.com)

Popular in

August

Cheapest in

January

Average price

$662

Good round-trip deal

$671 or less

Good one-way deal

$629 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
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($139 potential increase over avg. RT price).
Search Deals
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 February 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 February 24, 2025.

This Mytrip deal was found by Cheapflights users on 2/23. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/229:25 pmLHR - SEA
1 stop28h 25mIcelandair
Tue 4/293:45 pmSEA - LHR
1 stop20h 35mIcelandair
Deal found 2/23$525
This Gotogate deal was found by Cheapflights users on 2/24. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/193:40 pmLGW - SEA
1 stop34h 10mIcelandair
Mon 9/293:45 pmSEA - LGW
1 stop14h 55mIcelandair
Deal found 2/24$529
This Mytrip deal was found by Cheapflights users on 2/23. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/178:15 pmLHR - SEA
1 stop25h 05mLufthansa
Mon 3/313:05 pmSEA - LHR
1 stop14h 15mLufthansa
Deal found 2/23$568
This lol.travel deal was found by Cheapflights users on 2/23. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/178:55 amLHR - SEA
2 stops19h 35mAir Canada
Mon 3/3110:35 amSEA - LHR
1 stop18h 45mAir Canada
Deal found 2/23$574
This TravelUp deal was found by Cheapflights users on 2/23. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/217:40 amLHR - SEA
1 stop13h 40mMultiple Airlines
Fri 3/285:55 amSEA - LHR
2 stops20h 25mMultiple Airlines
Deal found 2/23$578
This United Airlines deal was found by Cheapflights users on 2/22. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/97:40 amLHR - SEA
1 stop13h 40mUnited Airlines
Sun 3/1611:59 pmSEA - LHR
2 stops24h 11mUnited Airlines
Deal found 2/22$590
This SWISS deal was found by Cheapflights users on 2/23. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/298:45 amLHR - SEA
2 stops20h 30mSWISS
Tue 5/62:40 pmSEA - LHR
2 stops19h 10mSWISS
Deal found 2/23$596
This Cheapflightsfares deal was found by Cheapflights users on 2/24. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/214:30 pmLHR - SEA
Nonstop9h 50mBritish Airways
Mon 5/51:30 pmSEA - LHR
Nonstop9h 20mBritish Airways
Deal found 2/24$607
This TravelUp deal was found by Cheapflights users on 2/23. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/215:25 pmLHR - SEA
Nonstop10h 20mKLM
Mon 4/2811:24 amSEA - LHR
1 stop14h 51mKLM
Deal found 2/23$609
This Gotogate deal was found by Cheapflights users on 2/23. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/1711:30 amLHR - SEA
1 stop31h 50mVirgin Atlantic
Mon 3/315:35 pmSEA - LHR
Nonstop9h 50mVirgin Atlantic
Deal found 2/23$614
This Delta deal was found by Cheapflights users on 2/23. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/176:30 amLHR - SEA
1 stop13h 10mDelta
Mon 3/315:35 pmSEA - LHR
Nonstop9h 50mDelta
Deal found 2/23$616
This The Travel House deal was found by Cheapflights users on 2/23. 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.
Tue 3/410:40 amLHR - SEA
1 stop16h 25mFinnair
Sat 3/89:16 pmSEA - LHR
2 stops16h 54mFinnair
Deal found 2/23$654

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 February 24, 2025.

Fly from

London

Fly to

Seattle

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 4/22

9:25 pm-5:50 pm

1 stop28h 25m

Seattle/Tacoma Intl

Tue 4/29

3:45 pm-8:20 pm

1 stop20h 35m

$525

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 3/17

8:15 pm-2:20 pm

1 stop25h 05m

Seattle/Tacoma Intl

Mon 3/31

3:05 pm-1:20 pm

1 stop14h 15m

$568

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 3/17

8:55 am-9:30 pm

2 stops19h 35m

Seattle/Tacoma Intl

Mon 3/31

10:35 am-1:20 pm

1 stop18h 45m

$574

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 3/21

7:40 am-2:20 pm

1 stop13h 40m

Seattle/Tacoma Intl

Fri 3/28

5:55 am-9:20 am

2 stops20h 25m

$578

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Tue 4/22

3:40 pm-8:40 pm

1 stop13h 00m

Seattle/Tacoma Intl

Fri 5/2

3:45 pm-11:45 am

1 stop12h 00m

$587

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 3/9

7:40 am-1:20 pm

1 stop13h 40m

Seattle/Tacoma Intl

Sun 3/16

11:59 pm-7:10 am

2 stops24h 11m

$590

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 4/29

8:45 am-9:15 pm

2 stops20h 30m

Seattle/Tacoma Intl

Tue 5/6

2:40 pm-5:50 pm

2 stops19h 10m

$596

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 4/21

4:30 pm-6:20 pm

Nonstop9h 50m

Seattle/Tacoma Intl

Mon 5/5

1:30 pm-6:50 am

Nonstop9h 20m

$607

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 3/17

1:15 pm-4:15 pm

Nonstop10h 00m

Seattle/Tacoma Intl

Mon 3/31

5:35 pm-11:25 am

Nonstop9h 50m

$608

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 4/21

5:25 pm-7:45 pm

Nonstop10h 20m

Seattle/Tacoma Intl

Mon 4/28

11:24 am-10:15 am

1 stop14h 51m

$609

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/24

Showing 1-10 of 60 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 February.
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*2 stars
AranGrantPrice Accuracy3 starsTrust Score*1 star
Thrive TravelPrice Accuracy3 starsTrust Score*2 stars
Justfly.comPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
OvagoPrice Accuracy3 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 February 14, 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 February 24, 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. Monday mornings 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 February 24, 2025.

The most flights from LON to SEA are scheduled on a Friday (21 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (11 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 February 24, 2025.
Peruse reviews from past customers who have flown with Emirates, Delta and KLM 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.
Emirates
8.1
Very good
3,269 reviews

Overall

8.1

Crew

8.3

Entertainment

8.2

Food

7.9

Boarding

8.1

Comfort

8.0

Reviews

1 / 20

2.0
Mediocre

Anonymous,Jun 2024

DXB - IAH

It was not a good experience the seats were small and uncomfortable the food was not good and they forgot to serve me my breakfast - there were 5 us in 2 rows that they just completely skipped us. Very disappointed.

Emirates
8.1
Very good
3,269 reviews
Emirates
8.1
Very good
3,269 reviews

Overall

8.1

Crew

8.3

Entertainment

8.2

Food

7.9

Boarding

8.1

Comfort

8.0

Reviews

1 / 20

2.0
Mediocre

Anonymous,Jun 2024

DXB - IAH

It was not a good experience the seats were small and uncomfortable the food was not good and they forgot to serve me my breakfast - there were 5 us in 2 rows that they just completely skipped us. Very disappointed.

Delta
8.0
Very good
8,175 reviews
Emirates
8.1
Very good
3,269 reviews

Overall

8.1

Crew

8.3

Entertainment

8.2

Food

7.9

Boarding

8.1

Comfort

8.0

Reviews

1 / 20

2.0
Mediocre

Anonymous,Jun 2024

DXB - IAH

It was not a good experience the seats were small and uncomfortable the food was not good and they forgot to serve me my breakfast - there were 5 us in 2 rows that they just completely skipped us. Very disappointed.

KLM
7.8
Good
1,333 reviews
Emirates
8.1
Very good
3,269 reviews

Overall

8.1

Crew

8.3

Entertainment

8.2

Food

7.9

Boarding

8.1

Comfort

8.0

Reviews

1 / 20

2.0
Mediocre

Anonymous,Jun 2024

DXB - IAH

It was not a good experience the seats were small and uncomfortable the food was not good and they forgot to serve me my breakfast - there were 5 us in 2 rows that they just completely skipped us. Very disappointed.

Finnair
7.6
Good
1,273 reviews
Emirates
8.1
Very good
3,269 reviews

Overall

8.1

Crew

8.3

Entertainment

8.2

Food

7.9

Boarding

8.1

Comfort

8.0

Reviews

1 / 20

2.0
Mediocre

Anonymous,Jun 2024

DXB - IAH

It was not a good experience the seats were small and uncomfortable the food was not good and they forgot to serve me my breakfast - there were 5 us in 2 rows that they just completely skipped us. Very disappointed.

SWISS
7.5
Good
1,567 reviews
Emirates
8.1
Very good
3,269 reviews

Overall

8.1

Crew

8.3

Entertainment

8.2

Food

7.9

Boarding

8.1

Comfort

8.0

Reviews

1 / 20

2.0
Mediocre

Anonymous,Jun 2024

DXB - IAH

It was not a good experience the seats were small and uncomfortable the food was not good and they forgot to serve me my breakfast - there were 5 us in 2 rows that they just completely skipped us. Very disappointed.

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. 7 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 15 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 $525. Other airlines that can offer you cheap pricing are Lufthansa, from $568, and Air Canada, from $574. Icelandair is currently priced 31% 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 $483 on WestJet. Other airlines that offer cheap prices include Aer Lingus from $529 and Icelandair from $621 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 Singapore Airlines (97%), KLM (89%) and Air France (89%).

  • What are the cheapest flights from London to Seattle?

    While on average a flight from London to Seattle is generally $1,448, our data shows the cheapest flight currently is $548. When looking at the most popular route, (London Heathrow - Seattle/Tacoma Intl), you can expect to pay $512 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
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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 7 airlines flying from London to Seattle

Discover the top 7 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 February 24, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$559Average$817FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$560Average$858FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$621Average$778FlexibilityNo cancel feeOn-time71%
Virgin AtlanticCheapest$635Average$984FlexibilityNo cancel feeOn-time72%
IberiaCheapest$673Average$1,001FlexibilityNo cancel feeOn-time77%
KLMCheapest$674Average$844FlexibilityNo cancel feeOn-time75%
DeltaCheapest$675Average$863FlexibilityNo cancel feeOn-timeN/A
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