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$410+ Cheap flights from the United Kingdom 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 9/17. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
Aug 28 — Sep 41
Fri 8/28
Fri 9/4
1 adult, Economy
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Cheap flight deals from United Kingdom to Seattle

Cheapest flights from United Kingdom to Seattle
Explore the most affordable flight options available from United Kingdom to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2026.

This TravelUp deal was found by Cheapflights users on 7/26. 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.
Mon 10/199:25 pm
LHR
-
SEA
1 stop31h 15m
Icelandair
Tue 10/273:35 pm
SEA
-
LHR
1 stop20h 55m
Icelandair
Deal found 7/26$602
This United Airlines deal was found by Cheapflights users on 7/27. 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 10/310:35 am
LHR
-
SEA
1 stop18h 26m
United Airlines
Sat 10/311:14 pm
SEA
-
LHR
1 stop23h 41m
United Airlines
Deal found 7/27$606
This Travelis deal was found by Cheapflights users on 7/25. 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 Travelis is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/83:40 pm
LGW
-
SEA
1 stop13h 00m
Icelandair
Tue 9/157:00 pm
SEA
-
LGW
1 stop11h 40m
Icelandair
Deal found 7/25$607
This United Airlines deal was found by Cheapflights users on 7/24. 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.
Mon 11/231:45 pm
LHR
-
SEA
1 stop15h 02m
United Airlines
Mon 11/2311:15 pm
SEA
-
LHR
1 stop23h 05m
United Airlines
Deal found 7/24$607
This Gotogate deal was found by Cheapflights users on 7/25. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/259:25 pm
LHR
-
SEA
1 stop22h 20m
Icelandair
Mon 9/73:40 pm
SEA
-
LHR
1 stop12h 15m
Icelandair
Deal found 7/25$608
This Gotogate deal was found by Cheapflights users on 7/25. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/253:40 pm
LGW
-
SEA
1 stop28h 05m
Icelandair
Mon 9/73:40 pm
SEA
-
LGW
1 stop12h 05m
Icelandair
Deal found 7/25$611
This Mytrip deal was found by Cheapflights users on 7/26. 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.
Thu 9/244:55 pm
STN
-
SEA
2 stops28h 50m
Multiple Airlines
Fri 10/23:55 pm
SEA
-
STN
2 stops20h 35m
Multiple Airlines
Deal found 7/26$611
This United Airlines deal was found by Cheapflights users on 7/28. 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.
Fri 10/28:00 am
LHR
-
SEA
2 stops21h 01m
United Airlines
Fri 10/211:14 pm
SEA
-
LHR
1 stop23h 41m
United Airlines
Deal found 7/28$611
This Gotogate deal was found by Cheapflights users on 7/26. 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.
Tue 9/11:00 pm
LGW
-
SEA
1 stop15h 40m
Icelandair
Wed 9/303:40 pm
SEA
-
LGW
1 stop15h 00m
Icelandair
Deal found 7/26$612
This Mytrip deal was found by Cheapflights users on 7/25. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/810:45 am
STN
-
SEA
2 stops33h 00m
Multiple Airlines
Tue 9/157:00 pm
SEA
-
STN
2 stops21h 10m
Multiple Airlines
Deal found 7/25$613
This deal was found by Cheapflights users on 7/27. 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.
Tue 9/14:30 pm
LHR
-
SEA
Nonstop9h 55m
British Airways
Sat 9/121:30 pm
SEA
-
LHR
Nonstop9h 15m
British Airways
Deal found 7/27$613
This TravelUp deal was found by Cheapflights users on 7/25. 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.
Tue 11/38:35 pm
LHR
-
SEA
1 stop28h 25m
Icelandair
Thu 11/262:35 pm
SEA
-
LHR
1 stop20h 55m
Icelandair
Deal found 7/25$615

Find flight deals from United Kingdom to Seattle

Keep the following information in mind while searching for United Kingdom to Seattle flight deals. Data was last updated July 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$602
(TravelUp)

One-way from

$410
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$833

Good round-trip deal

$792 or less

Good one-way deal

$637 or less
Provider with most accurate pricing for London (LON)-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for London (LON)-Seattle/Tacoma Intl flights.
Search Deals
From United Kingdom to Seattle/Tacoma Intl
Search Deals
One-way flight from United Kingdom to Seattle/Tacoma Intl
Search Deals
High demand for flights, 0% potential price rise
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals
Price to beat on a round-trip flight from United Kingdom to Seattle/Tacoma Intl.
Search Deals
Price to beat on a one-way flight from United Kingdom to Seattle/Tacoma Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from United Kingdom 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 29, 2026.
Use the filters below to find and compare flights from the United Kingdom to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 11/9

9:30 am-8:56 pm

2 stops19h 26m

Seattle/Tacoma Intl

Mon 11/16

7:05 am-7:40 am

1 stop16h 35m

$713

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 9/19

10:35 am-8:43 pm

1 stop18h 08m

Seattle/Tacoma Intl

Sat 9/19

11:04 pm-6:55 am

1 stop23h 51m

$720

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 8/29

8:00 am-8:43 pm

2 stops20h 43m

Seattle/Tacoma Intl

Sat 8/29

11:04 pm-6:55 am

1 stop23h 51m

$720

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 10/27

12:20 pm-3:54 pm

Nonstop10h 34m

Seattle/Tacoma Intl

Sun 11/8

4:50 pm-10:40 am

Nonstop9h 50m

$727

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Sun 8/23

3:40 pm-11:45 am

1 stop28h 05m

Seattle/Tacoma Intl

Sun 8/30

7:00 pm-11:45 am

1 stop32h 45m

$737

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 10/24

9:50 am-11:35 am

Nonstop9h 45m

Seattle/Tacoma Intl

Sat 10/31

2:26 pm-12:15 pm

1 stop14h 49m

$739

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 9/17

2:25 pm-9:36 pm

1 stop15h 11m

Seattle/Tacoma Intl

Mon 9/21

1:30 pm-6:45 am

Nonstop9h 15m

$744
Quickest round-trip

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 9/4

5:00 pm-7:00 pm

Nonstop10h 00m

Seattle/Tacoma Intl

Sun 9/20

9:40 pm-3:05 pm

Nonstop9h 25m

$745

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 9/4

5:45 pm-8:10 pm

Nonstop10h 25m

Seattle/Tacoma Intl

Sat 9/19

9:50 pm-3:35 pm

Nonstop9h 45m

$747

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Fri 9/4

10:25 am-11:20 pm

2 stops20h 55m

Seattle/Tacoma Intl

Sat 9/19

1:30 pm-9:20 am

1 stop11h 50m

$754

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/24

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from United Kingdom to Seattle

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

What is the cheapest month to book a flight from United Kingdom to Seattle?

Currently, February is the cheapest month in which you can book a flight from United Kingdom to Seattle (average of $672). Flying from United Kingdom to Seattle in July is currently the most expensive (average of $878). 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 GB to SEA?

Find hourly flight availability from United Kingdom 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 29, 2026.

When flying from United Kingdom to Seattle, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from United Kingdom to Seattle

Explore weekly flight availability from United Kingdom 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 29, 2026.

The most flights from GB0 to SEA are scheduled on a Tuesday (24 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (14 on average).

How often are flights from the United Kingdom to Seattle delayed?

About 10% of weekly flights between United Kingdom and Seattle have experienced delays in the past year, with the average delay time being 127 minutes.

What is the most punctual flight time for the United Kingdom to Seattle flights?

Historically, flights departing in the evening are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Thursday tends to have the lowest number of delays on this route, whereas Tuesday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on the United Kingdom to Seattle flights?

Over the last year, Delta have had the lowest number of delays on this route, with just 5% of flights being delayed.

How far ahead should I book a flight from United Kingdom to Seattle?

Booking 80 days in advance of your planned departure date is, on average, the best time to get cheap flights from United Kingdom to Seattle. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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 29, 2026.
See what other customers who have flown with Alaska Airlines,Delta, andVirgin Atlantic from the United Kingdom to Seattle have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
7.9
Good
12,728 reviews

Crew

8.5

Food

7.0

Overall

7.9

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
Alaska Airlines
7.9
Good
12,728 reviews
Alaska Airlines
7.9
Good
12,728 reviews

Crew

8.5

Food

7.0

Overall

7.9

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
Delta
7.8
Good
8,485 reviews
Alaska Airlines
7.9
Good
12,728 reviews

Crew

8.5

Food

7.0

Overall

7.9

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
Virgin Atlantic
7.5
Good
694 reviews
Alaska Airlines
7.9
Good
12,728 reviews

Crew

8.5

Food

7.0

Overall

7.9

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
Icelandair
7.0
Good
716 reviews
Alaska Airlines
7.9
Good
12,728 reviews

Crew

8.5

Food

7.0

Overall

7.9

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
British Airways
6.7
Okay
8,126 reviews
Alaska Airlines
7.9
Good
12,728 reviews

Crew

8.5

Food

7.0

Overall

7.9

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.

Related info for your journey

Find useful and relevant information for your journey from United Kingdom 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 United Kingdom?

    For a flight from United Kingdom to Seattle, you will be flying into Seattle/Tacoma Intl. Seattle/Tacoma Intl (SEA) is just 11.4 mi from the center of the city.

  • How long is the flight from United Kingdom to Seattle?

    Icelandair, United Airlines, and Virgin Atlantic can get you from United Kingdom to Seattle in just under 14h 09m. Your travel time can differ by up to 14h 21m. The distance between United Kingdom and Seattle is about 4783 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from United Kingdom to Seattle one-way?

    For one-way options, check prices for WestJet. According to our data, you can fly for as low as $362. Users have also found prices from $368 and $430 on Icelandair and Virgin Atlantic, respectively.

  • What are the most popular routes from United Kingdom to Seattle?

    Most travelers choose London Heathrow - Seattle/Tacoma Intl, London Stansted - Seattle/Tacoma Intl or London City - Seattle/Tacoma Intl when deciding on the best route from United Kingdom to Seattle.

  • What are the most reliable airlines from United Kingdom to Seattle?

    The top 3 most reliable airlines when flying from United Kingdom to Seattle are Scandinavian Airlines (88%), KLM (79%) and Air France (79%).

  • What are the cheapest flights from United Kingdom to Seattle?

    While on average a flight from United Kingdom to Seattle is generally $2,512, our data shows the cheapest flight currently is $381. When looking at the most popular route, (London Heathrow - Seattle/Tacoma Intl), you can expect to pay $559 for that flight.

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

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

  • How can I find direct flights from United Kingdom to Seattle?

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

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

    Yes. Cheapflights offers flight deals from United Kingdom 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 United Kingdom to Seattle?

    Currently, February is the cheapest month in which you can book a flight from United Kingdom to Seattle (average of $672). Flying from United Kingdom to Seattle in July is currently the most expensive (average of $878). 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
Renton
Tacoma
Lacey
Leavenworth
Olympia
Edmonds
Tukwila
Snoqualmie
Tumwater
Centralia
Puyallup
Kent
Ellensburg
Fife
Marysville
Ocean Shores
Lakewood
Lynnwood
Shoreline

Browse thousands of different options on Cheapflights for your next trip

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Top 9 airlines flying from United Kingdom to Seattle

Discover the top 9 airlines that operate flights from United Kingdom 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 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$485Average$796FlexibilityNo cancel feeOn-time75%
IcelandairCheapest$534Average$782FlexibilityNo cancel feeOn-time76%
DeltaCheapest$536Average$1,012FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$618Average$985FlexibilityNo cancel feeOn-time71%
British AirwaysCheapest$660Average$914FlexibilityNo cancel feeOn-time70%
Virgin AtlanticCheapest$670Average$908FlexibilityNo cancel feeOn-time72%
Aer LingusCheapest$705Average$813FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$759Average$857FlexibilityNo cancel feeOn-time75%
Air FranceCheapest$780Average$780FlexibilityNo cancel feeOn-time77%

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