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$536+ 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 8/27. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
1 adult, Economy
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Cheapflights Tip: The best prices from London Heathrow to Seattle/Tacoma Intl are usually found in February or November, booked 76 days in advance, depart on a Wednesday or Thursday 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 July 3, 2025.

Round-trip from

$643
(Air Canada)

One-way from

$536
(Kiwi.com)

Popular in

July

Cheapest in

February

Average price

$1,011

Good round-trip deal

$743 or less

Good one-way deal

$647 or less
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. 14% potential increase in price ($132 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($21 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 3, 2025.

This Air Canada deal was found by Cheapflights users on 7/1. 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 11/117:40 amLHR - SEA
2 stops19h 36mMultiple Airlines
Mon 11/175:50 amSEA - LHR
2 stops17h 20mMultiple Airlines
Deal found 7/1$643
This United Airlines deal was found by Cheapflights users on 7/1. 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.
Mon 11/106:30 amLHR - SEA
1 stop13h 40mUnited Airlines
Sun 11/166:20 amSEA - LHR
2 stops20h 55mUnited Airlines
Deal found 7/1$645
This Air Canada deal was found by Cheapflights users on 7/1. 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.
Thu 9/118:40 amLHR - SEA
2 stops17h 56mAir Canada
Thu 9/1812:00 pmSEA - LHR
1 stop14h 00mAir Canada
Deal found 7/1$646
This SWISS deal was found by Cheapflights users on 7/1. 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 11/105:10 pmLHR - SEA
2 stops38h 05mSWISS
Mon 11/172:30 pmSEA - LHR
2 stops20h 45mSWISS
Deal found 7/1$647
This Icelandair deal was found by Cheapflights users on 7/2. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/412:15 pmLHR - SEA
1 stop12h 45mIcelandair
Mon 11/102:35 pmSEA - LHR
1 stop12h 15mIcelandair
Deal found 7/2$648
This ChecknFly deal was found by Cheapflights users on 7/2. 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 9/132:10 pmLHR - SEA
1 stop27h 11mLufthansa
Sat 9/276:30 amSEA - LHR
2 stops17h 50mLufthansa
Deal found 7/2$649
This lol.travel deal was found by Cheapflights users on 7/2. 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.
Thu 8/287:30 pmLHR - SEA
1 stop26h 20mScandinavian Airlines
Sun 8/314:00 pmSEA - LHR
1 stop17h 40mScandinavian Airlines
Deal found 7/2$651
This SmartFares deal was found by Cheapflights users on 7/2. 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 8/251:25 pmLHR - SEA
Nonstop10h 05mVirgin Atlantic
Wed 9/105:35 pmSEA - LHR
Nonstop9h 45mVirgin Atlantic
Deal found 7/2$653
This ResecentrumGruppen deal was found by Cheapflights users on 7/1. 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 ResecentrumGruppen is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/255:25 pmLHR - SEA
Nonstop10h 20mAir France
Wed 9/108:25 pmSEA - LHR
Nonstop9h 50mAir France
Deal found 7/1$656
This American Airlines deal was found by Cheapflights users on 7/2. 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.
Sun 8/104:10 pmLHR - SEA
1 stop31h 50mAmerican Airlines
Thu 8/215:40 pmSEA - LHR
1 stop34h 30mAmerican Airlines
Deal found 7/2$662
This Delta deal was found by Cheapflights users on 7/1. 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 8/256:30 amLHR - SEA
1 stop13h 05mDelta
Wed 9/108:25 pmSEA - LHR
Nonstop9h 50mDelta
Deal found 7/1$678
This flugladen.de deal was found by Cheapflights users on 7/2. 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 flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/171:35 pmLHR - SEA
1 stop34h 25mBritish Airways
Sun 8/2411:30 pmSEA - LHR
1 stop22h 55mBritish Airways
Deal found 7/2$691

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 July 3, 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Seattle that are best for you.

Fly from

Heathrow

Fly to

Seattle

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 11/11

7:40 am-7:16 pm

2 stops19h 36m

Seattle/Tacoma Intl

Mon 11/17

5:50 am-7:10 am

2 stops17h 20m

$643

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 11/10

6:30 am-12:10 pm

1 stop13h 40m

Seattle/Tacoma Intl

Sun 11/16

6:20 am-11:15 am

2 stops20h 55m

$645

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 9/11

8:40 am-6:36 pm

2 stops17h 56m

Seattle/Tacoma Intl

Thu 9/18

12:00 pm-10:00 am

1 stop14h 00m

$646

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 11/10

5:10 pm-11:15 pm

2 stops38h 05m

Seattle/Tacoma Intl

Mon 11/17

2:30 pm-7:15 pm

2 stops20h 45m

$647

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 11/4

12:15 pm-5:00 pm

1 stop12h 45m

Seattle/Tacoma Intl

Mon 11/10

2:35 pm-10:50 am

1 stop12h 15m

$648

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 9/13

2:10 pm-9:21 am

1 stop27h 11m

Seattle/Tacoma Intl

Sat 9/27

6:30 am-8:20 am

2 stops17h 50m

$649

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 8/28

7:30 pm-1:50 pm

1 stop26h 20m

Seattle/Tacoma Intl

Sun 8/31

4:00 pm-5:40 pm

1 stop17h 40m

$651

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 8/25

1:25 pm-3:30 pm

Nonstop10h 05m

Seattle/Tacoma Intl

Wed 9/10

5:35 pm-11:20 am

Nonstop9h 45m

$653

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 8/25

5:25 pm-7:45 pm

Nonstop10h 20m

Seattle/Tacoma Intl

Wed 9/10

8:25 pm-2:15 pm

Nonstop9h 50m

$656

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 8/10

4:10 pm-4:00 pm

1 stop31h 50m

Seattle/Tacoma Intl

Thu 8/21

5:40 pm-12:10 pm

1 stop34h 30m

$662

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/1

Showing 1-10 of 15 results
1
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The best insider tips for London Heathrow Airport to Seattle flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your London Heathrow Airport to Seattle trip
Airports
LHR

Expect long security lines at Heathrow. Ensure all liquids are in one small bag to avoid delays during manual screening.

Read more about LHRby Ramsey Qubein
SEA

Use the Link light rail from SEA to downtown Seattle. It's inexpensive, runs every 10 minutes, and takes less than 40 minutes.

Read more about SEAby Brandon Schultz
Our travel experts
Ramsey Qubein

Ramsey Qubein

Expert on LHR

Ramsey Qubein

Ramsey Qubein

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

Brandon Schultz

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

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 June 27, 2025.

The best time to book flights from London Heathrow Airport to Seattle is 76 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 $390). 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 July 3, 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 June 29, 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 July 3, 2025.

The most flights from LHR to SEA are scheduled on a Monday (22 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (11 on average).

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 July 3, 2025.
Get a feel of what it's like to fly with Delta, Air France, and SWISS 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
8.0
Very good
7,982 reviews

Overall

8.0

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,982 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air France
7.5
Good
1,465 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
SWISS
7.5
Good
1,654 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,861 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Virgin Atlantic
7.4
Good
654 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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

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

    Currently priced at $645, United Airlines will fly you from London Heathrow Airport to Seattle and back. In addition to United Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Air Canada and SWISS - these airlines can fly you to your destination from $646 and $647, respectively. Users have found that United Airlines is 17% cheaper than the other options available to this destination.

  • 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 Aeromexico (95%), KLM (93%) and Air France (93%).

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

    The cheapest flight price from London Heathrow Airport to Seattle is $532. On average you can expect to pay $2,370. The most popular route, (London Heathrow - Seattle/Tacoma Intl), can usually be booked for $557.

  • 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 $390). 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
Tacoma
Lakewood
Ocean Shores
Lacey
Leavenworth
Lynnwood
Renton
Olympia
Shoreline
Puyallup
Cle Elum
Centralia
Kent
Federal Way
Chehalis
Kirkland
Aberdeen
Shelton

Browse thousands of different options on Cheapflights for your next trip

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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 July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$449Average$668FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$560Average$750FlexibilityNo cancel feeOn-time70%
IberiaCheapest$575Average$781FlexibilityNo cancel feeOn-time77%
Virgin AtlanticCheapest$594Average$925FlexibilityNo cancel feeOn-time72%
American AirlinesCheapest$620Average$854FlexibilityNo cancel feeOn-time71%
DeltaCheapest$632Average$863FlexibilityNo cancel feeOn-timeN/A

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