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$436+ 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 5/12. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
Apr 9 — Apr 161
Thu 4/9
Thu 4/16
1 adult, Economy
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Find cheap flights from Heathrow to Seattle with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

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3. Compare prices and book

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Cheapflights Tip: The best prices from London Heathrow to Seattle/Tacoma Intl are usually found in February or January, booked 81 days in advance, depart on a Wednesday or Monday and return on a Wednesday

Cheap 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 March 10, 2026.

This Trip.com deal was found by Cheapflights users on 3/5. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/166:40 am
LHR
-
SEA
2 stops22h 00m
Multiple Airlines
Mon 4/273:40 pm
SEA
-
LHR
2 stops21h 40m
Multiple Airlines
Deal found 3/5$565
This Mytrip deal was found by Cheapflights users on 3/6. 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 4/209:25 pm
LHR
-
SEA
1 stop31h 15m
Icelandair
Mon 5/43:40 pm
SEA
-
LHR
1 stop20h 40m
Icelandair
Deal found 3/6$570
This Mytrip deal was found by Cheapflights users on 3/8. 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 4/209:25 pm
LHR
-
SEA
1 stop31h 15m
Icelandair
Sat 5/27:00 pm
SEA
-
LHR
1 stop32h 55m
Icelandair
Deal found 3/8$575
This Trip.com deal was found by Cheapflights users on 3/9. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/237:00 am
LHR
-
SEA
2 stops42h 55m
Multiple Airlines
Thu 4/307:00 pm
SEA
-
LHR
2 stops17h 10m
Multiple Airlines
Deal found 3/9$581
This deal was found by Cheapflights users on 3/8. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/252:55 pm
LHR
-
SEA
Nonstop10h 00m
British Airways
Wed 12/26:50 pm
SEA
-
LHR
Nonstop9h 30m
British Airways
Deal found 3/8$586
This Gotogate deal was found by Cheapflights users on 3/9. 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.
Wed 3/1812:15 pm
LHR
-
SEA
1 stop12h 45m
Icelandair
Tue 3/317:00 pm
SEA
-
LHR
1 stop32h 55m
Icelandair
Deal found 3/9$590
This Mytrip deal was found by Cheapflights users on 3/6. 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 4/219:25 pm
LHR
-
SEA
1 stop31h 15m
Icelandair
Tue 4/287:00 pm
SEA
-
LHR
1 stop17h 20m
Icelandair
Deal found 3/6$595
This The Travel House deal was found by Cheapflights users on 3/6. 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.
Thu 4/161:05 pm
LHR
-
SEA
1 stop12h 50m
Icelandair
Wed 4/297:00 pm
SEA
-
LHR
1 stop17h 20m
Icelandair
Deal found 3/6$597
This Mytrip deal was found by Cheapflights users on 3/9. 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 4/139:25 pm
LHR
-
SEA
1 stop31h 15m
Icelandair
Tue 4/283:40 pm
SEA
-
LHR
1 stop20h 40m
Icelandair
Deal found 3/9$598
This Gotogate deal was found by Cheapflights users on 3/5. 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.
Thu 4/161:05 pm
LHR
-
SEA
1 stop15h 35m
Icelandair
Tue 4/287:00 pm
SEA
-
LHR
1 stop17h 20m
Icelandair
Deal found 3/5$600

Find 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 March 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$565
(Trip.com)

One-way from

$436
(Kiwi.com)

Popular in

July

Cheapest in

February

Average price

$764

Good round-trip deal

$814 or less

Good one-way deal

$598 or less
Provider with most accurate pricing for London Heathrow-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for London Heathrow-Seattle/Tacoma Intl flights.
Search Deals
From London Heathrow to Seattle/Tacoma Intl
Search Deals
One-way flight from London Heathrow to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($109 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a round-trip flight from London Heathrow to Seattle/Tacoma Intl.
Search Deals
Price to beat on a one-way flight from London Heathrow to Seattle/Tacoma Intl.
Search Deals

Cheapflights Fare Finder

 
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 March 10, 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 4/25

9:25 pm-8:40 pm

1 stop31h 15m

Seattle/Tacoma Intl

Sat 5/2

7:00 pm-8:20 pm

1 stop17h 20m

$647

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 4/22

7:25 am-4:59 pm

1 stop17h 34m

Seattle/Tacoma Intl

Wed 4/29

8:55 am-10:40 am

2 stops17h 45m

$758

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 4/27

6:00 am-10:42 pm

2 stops24h 42m

Seattle/Tacoma Intl

Mon 5/4

7:00 am-7:55 am

2 stops16h 55m

$760

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 9/4

5:15 pm-2:35 pm

1 stop29h 20m

Seattle/Tacoma Intl

Mon 9/7

7:20 pm-11:50 am

2 stops32h 30m

$792

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 9/4

4:25 pm-4:59 pm

1 stop32h 34m

Seattle/Tacoma Intl

Mon 9/7

11:00 pm-9:35 pm

1 stop14h 35m

$823
Quickest round-trip

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 4/25

2:45 pm-10:38 pm

1 stop15h 53m

Seattle/Tacoma Intl

Sat 5/2

1:35 pm-6:50 am

Nonstop9h 15m

$833

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 6/11

7:50 pm-1:45 pm

2 stops25h 55m

Seattle/Tacoma Intl

Sun 7/5

3:55 pm-7:55 pm

2 stops20h 00m

$844

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 7/1

11:25 am-11:10 pm

2 stops19h 45m

Seattle/Tacoma Intl

Wed 7/8

3:00 pm-1:20 pm

1 stop14h 20m

$858

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 8/22

3:35 pm-1:45 pm

2 stops30h 10m

Seattle/Tacoma Intl

Tue 9/8

3:55 pm-4:25 pm

2 stops16h 30m

$868
Cheapest one-way

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 9/2

5:00 pm-6:55 pm

Nonstop9h 55m

$520

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/6

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars
CheapflightsfaresPrice Accuracy2 starsTrust Score*2 stars
JetabroadPrice Accuracy3 starsTrust Score*1 star
PricelinePrice Accuracy1 starTrust 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 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.

Cheapflights Insights

Everything you need to know about your flight from London Heathrow Airport to Seattle

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 March 6, 2026.

The best time to book flights from London Heathrow Airport to Seattle is 81 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, February is the cheapest month in which you can book a flight from London Heathrow Airport to Seattle (average of $494). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of $687). 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 March 10, 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London Heathrow Airport to Seattle as you normally would.

How much does it cost to fly round-trip from London Heathrow Airport to Seattle?

The best insider tips for London Heathrow Airport to Seattle flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your London Heathrow Airport to Seattle trip
Our travel experts
Ramsey Qubein

Ramsey Qubein

Expert on LHR

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more
Brandon Schultz

Brandon Schultz

Expert on SEA

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Read more

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 March 10, 2026.
Get a feel of what it's like to fly with Delta,Virgin Atlantic, andAmerican Airlines from London Heathrow Airport to Seattle by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,276 reviews

Entertainment

7.8

Comfort

7.9

Boarding

8.1

Overall

7.9

Food

7.2

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,276 reviews
Delta
7.9
Good
8,276 reviews

Entertainment

7.8

Comfort

7.9

Boarding

8.1

Overall

7.9

Food

7.2

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Virgin Atlantic
7.5
Good
680 reviews
Delta
7.9
Good
8,276 reviews

Entertainment

7.8

Comfort

7.9

Boarding

8.1

Overall

7.9

Food

7.2

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
American Airlines
7.1
Good
11,406 reviews
Delta
7.9
Good
8,276 reviews

Entertainment

7.8

Comfort

7.9

Boarding

8.1

Overall

7.9

Food

7.2

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
British Airways
6.7
Okay
7,781 reviews
Delta
7.9
Good
8,276 reviews

Entertainment

7.8

Comfort

7.9

Boarding

8.1

Overall

7.9

Food

7.2

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

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 12 daily inbound flights from London Heathrow from 4 different airlines.

  • How long is the flight from London Heathrow Airport to Seattle?

    For as low as $758, Icelandair can have you in Seattle from London Heathrow Airport in 17h 34m. Airlines will cover a distance of 4783 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    Currently priced at $574, Virgin Atlantic will fly you from London Heathrow Airport to Seattle and back. In addition to Virgin Atlantic, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Delta and American Airlines - these airlines can fly you to your destination from $594 and $618, respectively. Users have found that Virgin Atlantic is 24% 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 Icelandair. According to our data, you can fly for as low as $368. Users have also found prices from $383 and $448 on Scandinavian Airlines and WestJet, 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 KLM (93%), Air France (93%) and Delta (93%).

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

    The cheapest flight price from London Heathrow Airport to Seattle is $468. On average you can expect to pay $1,484. The most popular route, (London Heathrow - Seattle/Tacoma Intl), can usually be booked for $575.

  • 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, February is the cheapest month in which you can book a flight from London Heathrow Airport to Seattle (average of $494). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of $687). 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 Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
SeaTac
Lakewood
Ocean Shores
Olympia
Kent
Lynnwood
Edmonds
Lacey
Renton
Puyallup
Kirkland
Tukwila
Fife
Aberdeen
Shoreline
Marysville
Centralia
Federal Way
Chehalis

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Heathrow to Seattle

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

Top 4 airlines flying from Heathrow to Seattle

Discover the top 4 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 March 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest$574Average$801FlexibilityNo cancel feeOn-time72%
DeltaCheapest$594Average$1,009FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$618Average$891FlexibilityNo cancel feeOn-time71%
British AirwaysCheapest$667Average$795FlexibilityNo cancel feeOn-time70%

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