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$531+ 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 1/9. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SEA
Dec 27 — Jan 31
Fri 12/27
Fri 1/3
1 adult, Economy
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The best prices from London to Seattle/Tacoma Intl are usually found in January or February, booked 65 days in advance, depart on a Wednesday or Friday 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 December 22, 2024.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$644
(Voliamo)

One-way from

$531
(Kiwi.com)

Popular in

August

Cheapest in

January

Average price

$829
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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High demand for flights, 15% potential price rise
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Best time to find cheap flights, 2% potential price drop
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Average for round-trip flights in December 2024
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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 December 22, 2024.

This Bravofly deal was found by Cheapflights users on 12/21. 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 Bravofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/2810:45 amLHR - SEA
1 stop14h 08mVirgin Atlantic
Tue 12/316:00 amSEA - LHR
1 stop16h 50mVirgin Atlantic
Deal found 12/21$660
This Booking.com deal was found by Cheapflights users on 12/21. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/281:25 pmLHR - SEA
2 stops16h 35mAir Canada
Tue 12/3110:35 amSEA - LHR
2 stops14h 45mAir Canada
Deal found 12/21$716
This United Airlines deal was found by Cheapflights users on 12/21. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/319:20 amLHR - SEA
1 stop17h 57mUnited Airlines
Fri 1/315:00 amSEA - LHR
2 stops17h 55mUnited Airlines
Deal found 12/21$742
This American Airlines deal was found by Cheapflights users on 12/22. 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.
Mon 12/301:10 pmLHR - SEA
2 stops19h 47mAmerican Airlines
Tue 2/1812:43 amSEA - LHR
1 stop21h 37mAmerican Airlines
Deal found 12/22$794
This SWISS deal was found by Cheapflights users on 12/21. 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.
Mon 12/306:00 amLHR - SEA
2 stops23h 15mSWISS
Wed 2/193:24 pmSEA - LHR
2 stops22h 16mSWISS
Deal found 12/21$864
This Gurufare deal was found by Cheapflights users on 12/21. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/2612:15 pmLHR - SEA
1 stop12h 45mIcelandair
Wed 1/82:35 pmSEA - LHR
1 stop12h 15mIcelandair
Deal found 12/21$932
This Delta deal was found by Cheapflights users on 12/21. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/246:30 amLHR - SEA
1 stop13h 22mDelta
Wed 1/85:45 pmSEA - LHR
Nonstop9h 25mDelta
Deal found 12/21$941
This KLM deal was found by Cheapflights users on 12/21. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/256:30 amLHR - SEA
1 stop13h 22mKLM
Wed 1/87:04 pmSEA - LHR
Nonstop9h 36mKLM
Deal found 12/21$945
This TravelUp deal was found by Cheapflights users on 12/22. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/287:35 pmLHR - SEA
1 stop24h 34mMultiple Airlines
Sat 1/115:45 pmSEA - LHR
Nonstop9h 25mMultiple Airlines
Deal found 12/22$951
This Air France deal was found by Cheapflights users on 12/21. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/253:50 pmLHR - SEA
Nonstop10h 40mAir France
Wed 1/87:04 pmSEA - LHR
Nonstop9h 36mAir France
Deal found 12/21$962
This ChecknFly deal was found by Cheapflights users on 12/22. 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 ChecknFly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/289:20 amLHR - SEA
1 stop21h 28mLufthansa
Sat 1/115:15 pmSEA - LHR
1 stop30h 10mLufthansa
Deal found 12/22$1,003
This Kiwi.com deal was found by Cheapflights users on 12/22. 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.
Tue 12/246:15 pmLGW - SEA
2 stops48h 10mMultiple Airlines
Tue 12/3111:49 amSEA - LGW
1 stop14h 46mMultiple Airlines
Deal found 12/22$1,119

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 December 22, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

LondonSeattle

LCY - SEA

LCYSEA

London City

Sat 3/1

8:30 am-9:15 pm

2 stops20h 45m

Seattle/Tacoma Intl

Sun 3/9

7:00 am-9:25 am

2 stops19h 25m

$644

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 4/21

9:30 am-9:26 pm

2 stops19h 56m

Seattle/Tacoma Intl

Thu 7/3

10:00 am-11:50 am

2 stops17h 50m

$645

LondonSeattle

LCY - SEA

LCYSEA

London City

Sat 4/26

10:00 am-4:00 pm

1 stop14h 00m

Seattle/Tacoma Intl

Wed 4/30

5:35 pm-4:40 pm

1 stop15h 05m

$646

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 3/21

3:00 pm-5:55 pm

Nonstop9h 55m

Seattle/Tacoma Intl

Fri 3/28

12:59 am-8:00 am

1 stop24h 01m

$646

LondonSeattle

STN - SEA

STNSEA

London Stansted

Mon 2/3

6:30 am-5:00 pm

2 stops18h 30m

Seattle/Tacoma Intl

Mon 2/17

2:35 pm-8:40 pm

2 stops22h 05m

$647

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 6/10

1:25 pm-3:45 pm

Nonstop10h 20m

Seattle/Tacoma Intl

Tue 6/17

11:15 am-11:10 am

1 stop15h 55m

$647

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 1/20

3:15 pm-7:56 pm

2 stops36h 41m

Seattle/Tacoma Intl

Fri 1/24

3:15 pm-12:50 pm

1 stop13h 35m

$648

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Tue 4/15

3:40 pm-8:40 pm

1 stop13h 00m

Seattle/Tacoma Intl

Thu 4/24

3:45 pm-2:40 pm

1 stop14h 55m

$649

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 6/10

11:25 am-12:51 am

2 stops21h 26m

Seattle/Tacoma Intl

Mon 6/23

12:46 pm-12:20 pm

1 stop15h 34m

$656

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 6/7

10:20 am-4:00 pm

1 stop13h 40m

Seattle/Tacoma Intl

Mon 6/16

8:20 pm-1:40 pm

Nonstop9h 20m

$658

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/22

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 December.
ProviderPrice AccuracyTrust Score*
eDreamsPrice Accuracy3 starsTrust Score*3 stars
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*1 star
AranGrantPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
Justfly.comPrice Accuracy3 starsTrust Score*3 stars
KAYAKPrice Accuracy-Trust Score*1 star
OvagoPrice Accuracy2 starsTrust Score*3 stars
PricelinePrice 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 December 20, 2024.

To ensure you get the cheapest price possible for a flight from London to Seattle, you should look to book at least 65 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 December 22, 2024.

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 evening tend to be the most expensive. A flight at noon could potentially save you up to 9% 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 Friday at noon when fares are most often at their lowest. Sunday 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 December 22, 2024.

The most flights from LON to SEA are scheduled on a Friday (21 on average). You will have fewer flight options on Monday, 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 December 22, 2024.
Peruse reviews from past customers who have flown with Air Canada, Delta 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
8,594 reviews

Overall

8.0

Crew

8.6

Comfort

8.0

Food

7.3

Boarding

8.2

Entertainment

7.9

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
8,594 reviews
Delta
8.0
Very good
8,594 reviews

Overall

8.0

Crew

8.6

Comfort

8.0

Food

7.3

Boarding

8.2

Entertainment

7.9

Reviews

1 / 10

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

Air New Zealand
8.0
Very good
492 reviews
Delta
8.0
Very good
8,594 reviews

Overall

8.0

Crew

8.6

Comfort

8.0

Food

7.3

Boarding

8.2

Entertainment

7.9

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
1,342 reviews
Delta
8.0
Very good
8,594 reviews

Overall

8.0

Crew

8.6

Comfort

8.0

Food

7.3

Boarding

8.2

Entertainment

7.9

Reviews

1 / 10

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

Finnair
7.7
Good
1,283 reviews
Delta
8.0
Very good
8,594 reviews

Overall

8.0

Crew

8.6

Comfort

8.0

Food

7.3

Boarding

8.2

Entertainment

7.9

Reviews

1 / 10

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

SWISS
7.6
Good
1,605 reviews
Delta
8.0
Very good
8,594 reviews

Overall

8.0

Crew

8.6

Comfort

8.0

Food

7.3

Boarding

8.2

Entertainment

7.9

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 13 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 $645. Other airlines that can offer you cheap pricing are Delta, from $646, and American Airlines, from $646. Air Canada is currently priced 15% 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 $533 on Aer Lingus. Other airlines that offer cheap prices include WestJet from $535 and Icelandair from $536 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 Air France (73%), Delta (73%) and Virgin Atlantic (73%).

  • What are the cheapest flights from London to Seattle?

    While on average a flight from London to Seattle is generally $1,408, our data shows the cheapest flight currently is $676. When looking at the most popular route, (London Heathrow - Seattle/Tacoma Intl), you can expect to pay $462 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.

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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 December 22, 2024.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$558Average$823FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$600Average$910FlexibilityNo cancel feeOn-time70%
Virgin AtlanticCheapest$614Average$1,006FlexibilityNo cancel feeOn-time72%
American AirlinesCheapest$621Average$764FlexibilityNo cancel feeOn-time71%
DeltaCheapest$663Average$883FlexibilityNo cancel feeOn-timeN/A
Aer LingusCheapest$671Average$988FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$674Average$844FlexibilityNo cancel feeOn-time75%
IberiaCheapest$680Average$975FlexibilityNo cancel feeOn-time77%
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