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$573+ 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 8/18. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
Jul 27 — Aug 31
Mon 7/27
Mon 8/3
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”

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Cheapflights Tip: The best prices from London Heathrow to Seattle/Tacoma Intl are usually found in January or February, booked 81 days in advance, depart on a Monday or Sunday 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 June 27, 2026.

This TravelUp deal was found by Cheapflights users on 6/25. 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 10/249:50 am
LHR
-
SEA
Nonstop9h 45m
British Airways
Fri 10/309:05 pm
SEA
-
LHR
1 stop13h 25m
British Airways
Deal found 6/25$611
This Kiwi.com deal was found by Cheapflights users on 6/25. 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 9/297:25 am
LHR
-
SEA
1 stop17h 34m
Multiple Airlines
Wed 10/78:00 am
SEA
-
LHR
2 stops16h 05m
Multiple Airlines
Deal found 6/25$612
This Kiwi.com deal was found by Cheapflights users on 6/25. 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.
Wed 9/307:25 am
LHR
-
SEA
1 stop17h 34m
Multiple Airlines
Mon 10/58:00 am
SEA
-
LHR
2 stops16h 05m
Multiple Airlines
Deal found 6/25$618
This Cheapflightsfares deal was found by Cheapflights users on 6/25. 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.
Thu 10/19:50 am
LHR
-
SEA
Nonstop9h 45m
British Airways
Thu 10/81:30 pm
SEA
-
LHR
Nonstop9h 15m
British Airways
Deal found 6/25$620
This SWISS deal was found by Cheapflights users on 6/25. 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.
Wed 9/308:40 am
LHR
-
SEA
2 stops17h 52m
SWISS
Thu 10/81:19 pm
SEA
-
LHR
2 stops20h 31m
SWISS
Deal found 6/25$621
This British Airways deal was found by Cheapflights users on 6/25. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1712:00 pm
LHR
-
SEA
1 stop13h 10m
British Airways
Sun 11/18:05 pm
SEA
-
LHR
1 stop11h 30m
British Airways
Deal found 6/25$622
This Air Canada deal was found by Cheapflights users on 6/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/296:00 am
LHR
-
SEA
2 stops20h 32m
Air Canada
Tue 10/67:20 pm
SEA
-
LHR
1 stop34h 00m
Air Canada
Deal found 6/25$623
This United Airlines deal was found by Cheapflights users on 6/25. 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.
Sat 10/37:25 am
LHR
-
SEA
1 stop17h 34m
United Airlines
Tue 10/612:43 pm
SEA
-
LHR
1 stop12h 57m
United Airlines
Deal found 6/25$625
This SWISS deal was found by Cheapflights users on 6/25. 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.
Fri 10/26:00 am
LHR
-
SEA
2 stops20h 52m
SWISS
Thu 10/81:19 pm
SEA
-
LHR
2 stops20h 31m
SWISS
Deal found 6/25$626
This United Airlines deal was found by Cheapflights users on 6/24. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/99:00 am
LHR
-
SEA
1 stop15h 59m
United Airlines
Sat 8/111:00 pm
SEA
-
LHR
1 stop14h 20m
United Airlines
Deal found 6/24$627
This United Airlines deal was found by Cheapflights users on 6/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/99:00 am
LHR
-
SEA
1 stop15h 59m
United Airlines
Thu 7/303:40 pm
SEA
-
LHR
1 stop12h 45m
United Airlines
Deal found 6/23$628
This British Airways deal was found by Cheapflights users on 6/25. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1512:00 pm
LHR
-
SEA
1 stop13h 10m
British Airways
Thu 10/221:30 pm
SEA
-
LHR
Nonstop9h 15m
British Airways
Deal found 6/25$629

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 June 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$611
(TravelUp)

One-way from

$573
(Cheapflightsfares)

Popular in

July

Cheapest in

January

Average price

$878

Good round-trip deal

$703 or less

Good one-way deal

$637 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. 10% potential increase in price ($88 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 June 27, 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

Thu 10/15

12:00 pm-5:10 pm

1 stop13h 10m

Seattle/Tacoma Intl

Mon 10/19

8:20 pm-1:45 pm

Nonstop9h 25m

$631

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 9/20

6:20 am-5:10 pm

1 stop18h 50m

Seattle/Tacoma Intl

Sat 9/26

10:59 am-12:15 pm

1 stop17h 16m

$632

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 10/24

9:50 am-11:35 am

Nonstop9h 45m

Seattle/Tacoma Intl

Mon 11/2

8:11 am-6:35 am

1 stop14h 24m

$634

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 9/14

8:55 am-4:42 pm

1 stop15h 47m

Seattle/Tacoma Intl

Mon 9/28

1:30 pm-6:45 am

Nonstop9h 15m

$640

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 11/1

9:30 am-12:00 pm

1 stop34h 30m

Seattle/Tacoma Intl

Tue 11/10

3:15 pm-11:50 am

1 stop12h 35m

$646

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 9/14

11:25 am-11:26 pm

2 stops20h 01m

Seattle/Tacoma Intl

Mon 9/21

12:44 pm-9:40 am

1 stop12h 56m

$665
Quickest round-trip

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 8/23

6:30 pm-8:46 pm

Nonstop10h 16m

Seattle/Tacoma Intl

Wed 9/2

9:50 pm-3:35 pm

Nonstop9h 45m

$696

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 8/24

11:25 am-11:26 pm

2 stops20h 01m

Seattle/Tacoma Intl

Tue 9/1

12:44 pm-12:25 pm

1 stop15h 41m

$696

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 8/20

5:45 pm-8:03 pm

Nonstop10h 18m

Seattle/Tacoma Intl

Sat 8/29

9:45 pm-3:35 pm

Nonstop9h 50m

$713

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 9/4

6:30 am-11:47 am

1 stop13h 17m

Seattle/Tacoma Intl

Mon 9/7

6:20 pm-12:10 pm

Nonstop9h 50m

$724

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/23

Showing 1-10 of 22 resultsSorted by cheapest first
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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 June.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy2 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy2 starsTrust Score*1 star
JetabroadPrice Accuracy3 starsTrust Score*3 stars
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?

The best time to book flights from London Heathrow Airport to Seattle is 80 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 $665). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of $910). 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 June 27, 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 June 27, 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
7.8
Good
8,453 reviews

Comfort

7.8

Food

7.2

Entertainment

7.8

Overall

7.8

Crew

8.5

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,
Delta
7.8
Good
8,453 reviews
Delta
7.8
Good
8,453 reviews

Comfort

7.8

Food

7.2

Entertainment

7.8

Overall

7.8

Crew

8.5

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,
Virgin Atlantic
7.5
Good
690 reviews
Delta
7.8
Good
8,453 reviews

Comfort

7.8

Food

7.2

Entertainment

7.8

Overall

7.8

Crew

8.5

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,
American Airlines
7.1
Good
11,776 reviews
Delta
7.8
Good
8,453 reviews

Comfort

7.8

Food

7.2

Entertainment

7.8

Overall

7.8

Crew

8.5

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,
Icelandair
7.0
Good
690 reviews
Delta
7.8
Good
8,453 reviews

Comfort

7.8

Food

7.2

Entertainment

7.8

Overall

7.8

Crew

8.5

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,
British Airways
6.7
Okay
8,070 reviews
Delta
7.8
Good
8,453 reviews

Comfort

7.8

Food

7.2

Entertainment

7.8

Overall

7.8

Crew

8.5

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,

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 19 daily inbound flights from London Heathrow from 6 different airlines.

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

    For as low as $631, British Airways can have you in Seattle from London Heathrow Airport in 13h 10m. 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 $403, 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 KLM and Delta - these airlines can fly you to your destination from $485 and $600, respectively. Users have found that Icelandair is 48% 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 $469 and $525 on Aer Lingus and Lufthansa, 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 (85%), Air France (85%) and Delta (85%).

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

    The cheapest flight price from London Heathrow Airport to Seattle is $521. On average you can expect to pay $1,332. The most popular route, (London Heathrow - Seattle/Tacoma Intl), can usually be booked for $238.

  • 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 $665). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of $910). 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
SeaTac
Tacoma
Lacey
Leavenworth
Olympia
Ocean Shores
Renton
Edmonds
Snoqualmie
Tumwater
Tukwila
Kent
Lynnwood
Ellensburg
Fife
Marysville
Lakewood
Issaquah
Shoreline
Centralia

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 6 airlines flying from Heathrow to Seattle

Discover the top 6 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 June 27, 2026.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$403Average$620FlexibilityNo cancel feeOn-time76%
KLMCheapest$485Average$796FlexibilityNo cancel feeOn-time75%
DeltaCheapest$600Average$1,009FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$618Average$985FlexibilityNo cancel feeOn-time71%
British AirwaysCheapest$661Average$895FlexibilityNo cancel feeOn-time70%
Virgin AtlanticCheapest$670Average$903FlexibilityNo cancel feeOn-time72%

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