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$485+ Cheap flights from Heathrow (LHR) 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.
LHR — SEA
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
1 adult, Economy
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The best prices from London Heathrow to Seattle/Tacoma Intl are usually found in November or January, booked 54 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

Cheap flight deals from Heathrow to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) 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 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$522
(Gotogate)

One-way from

$485
(Kiwi.com)

Popular in

July

Cheapest in

November

Average price

$697

Good round-trip deal

$640 or less

Good one-way deal

$611 or less
Provider with most accurate pricing for London Heathrow-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for London Heathrow-Seattle/Tacoma Intl flights.
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From London Heathrow to Seattle/Tacoma Intl
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One-way flight from London Heathrow to Seattle/Tacoma Intl
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Highest demand for flights based on searches. 15% potential increase in price ($139 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($19 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 Heathrow to Seattle/Tacoma Intl.
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Price to beat on a one-way flight from London Heathrow to Seattle/Tacoma Intl.
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Find flight deals from Heathrow to Seattle

Cheapest flights from Heathrow to Seattle
Explore the most affordable flight options available from Heathrow to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 20, 2025.

This Gotogate deal was found by Cheapflights users on 2/19. 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 4/219:25 pmLHR - SEA
1 stop28h 25mIcelandair
Tue 4/293:45 pmSEA - LHR
1 stop12h 10mIcelandair
Deal found 2/19$522
This United Airlines deal was found by Cheapflights users on 2/19. 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.
Thu 3/69:30 amLHR - SEA
2 stops44h 00mUnited Airlines
Sun 3/97:05 pmSEA - LHR
1 stop32h 05mUnited Airlines
Deal found 2/19$571
This TravelUp deal was found by Cheapflights users on 2/19. 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 40mLufthansa
Fri 3/283:05 pmSEA - LHR
1 stop12h 05mLufthansa
Deal found 2/19$576
This TravelUp deal was found by Cheapflights users on 2/19. 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.
Tue 3/116:30 amLHR - SEA
1 stop13h 10mKLM
Tue 4/18:20 pmSEA - LHR
Nonstop9h 55mKLM
Deal found 2/19$591
This SWISS deal was found by Cheapflights users on 2/19. 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 3/118:55 amLHR - SEA
2 stops20h 58mSWISS
Tue 4/13:24 pmSEA - LHR
2 stops18h 26mSWISS
Deal found 2/19$592
This Gotogate deal was found by Cheapflights users on 2/19. 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 3/176:30 amLHR - SEA
1 stop13h 40mMultiple Airlines
Wed 4/27:05 pmSEA - LHR
2 stops30h 55mMultiple Airlines
Deal found 2/19$599
This TravelUp deal was found by Cheapflights users on 2/19. 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.
Tue 3/119:25 amLHR - SEA
Nonstop9h 55mBritish Airways
Tue 4/18:20 pmSEA - LHR
Nonstop9h 20mBritish Airways
Deal found 2/19$609
This Gotogate deal was found by Cheapflights users on 2/19. 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 3/177:35 pmLHR - SEA
1 stop23h 45mVirgin Atlantic
Wed 4/25:35 pmSEA - LHR
Nonstop9h 50mVirgin Atlantic
Deal found 2/19$610
This lol.travel deal was found by Cheapflights users on 2/19. 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
Wed 4/25:45 amSEA - LHR
2 stops16h 45mAir Canada
Deal found 2/19$612
This Cheapflightsfares deal was found by Cheapflights users on 2/19. 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.
Tue 4/229:25 amLHR - SEA
Nonstop9h 45mIberia
Wed 4/308:20 pmSEA - LHR
Nonstop9h 20mIberia
Deal found 2/19$615
This Delta deal was found by Cheapflights users on 2/19. 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 3/36:30 amLHR - SEA
1 stop13h 07mDelta
Mon 3/176:45 pmSEA - LHR
Nonstop9h 25mDelta
Deal found 2/19$620
This SmartFares deal was found by Cheapflights users on 2/19. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/32:50 pmLHR - SEA
1 stop31h 31mWestJet
Wed 3/53:15 pmSEA - LHR
1 stop13h 35mWestJet
Deal found 2/19$629

Find flights from Heathrow to Seattle within your budget

Customize your flight search to find flights from Heathrow 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 20, 2025.

Fly from

Heathrow

Fly to

Seattle

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 4/21

9:25 pm-5:50 pm

1 stop28h 25m

Seattle/Tacoma Intl

Tue 4/29

3:45 pm-11:55 am

1 stop12h 10m

$522

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 3/6

9:30 am-9:30 pm

2 stops44h 00m

Seattle/Tacoma Intl

Sun 3/9

7:05 pm-10:10 am

1 stop32h 05m

$571

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 3/21

7:40 am-2:20 pm

1 stop13h 40m

Seattle/Tacoma Intl

Fri 3/28

3:05 pm-10:10 am

1 stop12h 05m

$576

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 3/11

6:30 am-12:40 pm

1 stop13h 10m

Seattle/Tacoma Intl

Tue 3/18

6:45 pm-11:10 am

Nonstop9h 25m

$591

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 3/11

8:55 am-10:53 pm

2 stops20h 58m

Seattle/Tacoma Intl

Tue 4/1

3:24 pm-5:50 pm

2 stops18h 26m

$592

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 3/11

9:25 am-12:20 pm

Nonstop9h 55m

Seattle/Tacoma Intl

Tue 4/1

8:20 pm-1:40 pm

Nonstop9h 20m

$609

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 3/17

7:35 pm-12:20 pm

1 stop23h 45m

Seattle/Tacoma Intl

Wed 4/2

5:35 pm-11:25 am

Nonstop9h 50m

$610

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 3/17

8:55 am-9:30 pm

2 stops19h 35m

Seattle/Tacoma Intl

Wed 4/2

5:45 am-6:30 am

2 stops16h 45m

$612

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 4/21

5:25 pm-7:45 pm

Nonstop10h 20m

Seattle/Tacoma Intl

Tue 4/29

11:24 am-11:00 am

1 stop15h 36m

$613

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 4/22

9:25 am-11:10 am

Nonstop9h 45m

Seattle/Tacoma Intl

Wed 4/30

8:20 pm-1:40 pm

Nonstop9h 20m

$615

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/19

Showing 1-10 of 25 results
1
2
3

Compare providers for flights from Heathrow 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 Heathrow to Seattle in February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
GotogatePrice Accuracy3 starsTrust Score*3 stars
Kiwi.comPrice Accuracy3 starsTrust Score*2 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 Heathrow Airport-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on London Heathrow Airport-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from London Heathrow Airport-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on London Heathrow Airport-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 Heathrow Airport-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 Heathrow to Seattle

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

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

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

Use this chart to determine the optimal time to book a round-trip flight from Heathrow to Seattle. Price data was last updated on February 14, 2025.

The best time to book flights from London Heathrow Airport to Seattle is 54 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 London Heathrow Airport to Seattle?

Currently, January is the cheapest month in which you can book a flight from London Heathrow Airport to Seattle (average of $238). Flying from London Heathrow Airport 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 LHR to SEA?

Find hourly flight availability from Heathrow 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 20, 2025.

One of the essential ways to save on airfare from London Heathrow Airport 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 11% on airfare.

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

Use this chart to determine the cheapest time to fly round-trip from Heathrow to Seattle. Price data was last updated on February 16, 2025.

Travelers seeking maximum savings on their London Heathrow Airport to Seattle flight should consider departing on Wednesday mornings 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 Heathrow Airport to Seattle

Explore weekly flight availability from Heathrow 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 20, 2025.

The most flights from LHR to SEA are scheduled on a Wednesday (16 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 February 20, 2025.
Read through reviews of airlines operating flights from London to Seattle, such as Delta, KLM and Finnair. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
8,227 reviews

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Food

7.3

Crew

8.5

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

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

Delta
8.0
Very good
8,227 reviews
Delta
8.0
Very good
8,227 reviews

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Food

7.3

Crew

8.5

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

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

KLM
7.8
Good
1,333 reviews
Delta
8.0
Very good
8,227 reviews

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Food

7.3

Crew

8.5

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

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

Finnair
7.6
Good
1,274 reviews
Delta
8.0
Very good
8,227 reviews

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Food

7.3

Crew

8.5

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

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

SWISS
7.5
Good
1,572 reviews
Delta
8.0
Very good
8,227 reviews

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Food

7.3

Crew

8.5

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

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

Virgin Atlantic
7.5
Good
654 reviews
Delta
8.0
Very good
8,227 reviews

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Food

7.3

Crew

8.5

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

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 Heathrow 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 Heathrow?

    Located just 11.4 mi from the city center, Seattle/Tacoma Intl is the airport most travelers will use when flying to Seattle from London Heathrow. Booking flights from London Heathrow to Seattle/Tacoma Intl (SEA) should be relatively easy as there are 11 daily inbound flights from London Heathrow from 8 different airlines.

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

    Currently priced at $522, Icelandair will fly you from London Heathrow Airport to Seattle and back. In addition to Icelandair, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from United Airlines and Lufthansa - these airlines can fly you to your destination from $571 and $576, respectively. Users have found that Icelandair is 33% cheaper than the other options available to this destination.

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

    For one-way options, check prices for WestJet. According to our data, you can fly for as low as $490. Users have also found prices from $525 and $577 on Aer Lingus and Icelandair, respectively.

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

    The top 3 most reliable airlines when flying from London Heathrow Airport to Seattle are Singapore Airlines (97%), KLM (89%) and Air France (89%).

  • What are the cheapest flights from London Heathrow Airport to Seattle?

    The cheapest flight price from London Heathrow Airport to Seattle is $538. On average you can expect to pay $1,430. The most popular route, (London Heathrow - Seattle/Tacoma Intl), can usually be booked for $514.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Heathrow 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 Heathrow Airport to Seattle?

    Currently, January is the cheapest month in which you can book a flight from London Heathrow Airport to Seattle (average of $238). Flying from London Heathrow Airport 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 Heathrow Airport?

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

Browse thousands of different options on Cheapflights for your next trip

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Top 8 airlines flying from Heathrow to Seattle

Discover the top 8 airlines that operate flights from Heathrow 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 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$559Average$817FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$560Average$850FlexibilityNo cancel feeOn-time70%
Virgin AtlanticCheapest$617Average$997FlexibilityNo cancel feeOn-time72%
American AirlinesCheapest$621Average$778FlexibilityNo cancel feeOn-time71%
Aer LingusCheapest$671Average$1,000FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$673Average$1,001FlexibilityNo cancel feeOn-time77%
KLMCheapest$674Average$844FlexibilityNo cancel feeOn-time75%
DeltaCheapest$675Average$862FlexibilityNo cancel feeOn-timeN/A
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