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Cheap flights from the United Kingdom to Seattle from £284

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 23/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
3 Sep — 10 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from United Kingdom to Seattle

Enter your travel dates to find the best prices.

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 4 August 2026.

Mon 31/809:50 -
Nonstop9h 45m
Fri 18/913:30 -
Nonstop9h 15m
Deal found 3/8£450
Mon 12/1021:25 -
1 stop28h 30m
Mon 19/1019:00 -
1 stop17h 20m
Deal found 30/7£452
Sun 25/1013:35 -
1 stop29h 44m
Tue 27/1010:40 -
1 stop13h 45m
Deal found 1/8£453
Wed 26/813:05 -
1 stop15h 35m
Fri 18/915:40 -
1 stop12h 15m
Deal found 3/8£454
Tue 6/1015:40 -
1 stop13h 00m
Mon 12/1019:00 -
1 stop11h 40m
Deal found 30/7£455
Tue 6/1021:25 -
1 stop28h 30m
Mon 12/1015:40 -
1 stop12h 15m
Deal found 30/7£457
Tue 6/1013:05 -
1 stop15h 35m
Mon 19/1015:40 -
1 stop12h 15m
Deal found 31/7£459
Sun 1/1120:35 -
1 stop28h 25m
Tue 10/1108:18 -
2 stops15h 47m
Deal found 3/8£461
Tue 25/809:50 -
Nonstop9h 45m
Wed 16/913:30 -
Nonstop9h 15m
Deal found 3/8£462
Mon 7/915:40 -
1 stop13h 00m
Fri 25/915:40 -
1 stop15h 00m
Deal found 3/8£462
Sat 10/1021:25 -
1 stop28h 30m
Tue 10/1108:18 -
2 stops15h 47m
Deal found 30/7£462
Wed 26/809:50 -
Nonstop9h 45m
Sat 19/920:20 -
Nonstop9h 25m
Deal found 3/8£463

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 4 August 2026.

Round-trip from

£450

One-way from

£284

Popular in

December

Cheapest in

February

Average price

£594

Good round-trip deal

£565 or less

Good one-way deal

£564 or less
British Airways
  • British Airways
  • 31/8-18/9
  • Nonstop
  • 19h 00m total
  • United Kingdom to Seattle
Search Deals
23/9
  • 23/9
  • 3 total stops
  • 58h 55m total
  • United Kingdom to Seattle
Search Deals
High demand for flights, 0% potential price rise
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£6 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 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

 
Customise 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 858,174 searches. Data last updated 4 August 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 return flight

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Wed 2/9

15:40-20:40

1 stop13h 00m

Seattle/Tacoma Intl

Wed 16/9

19:00-14:40

1 stop11h 40m

£510

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Sun 18/10

15:40-17:55

1 stop34h 15m

Seattle/Tacoma Intl

Tue 3/11

14:35-10:55

1 stop12h 20m

£521

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 16/9

10:50-16:59

1 stop14h 09m

Seattle/Tacoma Intl

Fri 25/9

09:05-09:40

2 stops16h 35m

£525

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 1/9

07:25-19:07

2 stops19h 42m

Seattle/Tacoma Intl

Tue 8/9

15:30-14:10

1 stop14h 40m

£534

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 17/9

07:25-19:14

2 stops19h 49m

Seattle/Tacoma Intl

Thu 24/9

08:30-10:25

2 stops17h 55m

£535

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Sat 10/10

10:25-23:04

2 stops20h 39m

Seattle/Tacoma Intl

Tue 10/11

07:15-15:45

2 stops24h 30m

£560
Fastest return journey

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 28/8

11:40-14:00

Nonstop10h 20m

Seattle/Tacoma Intl

Sat 12/9

21:50-15:35

Nonstop9h 45m

£563

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Sat 7/11

10:00-23:04

2 stops21h 04m

Seattle/Tacoma Intl

Thu 12/11

16:05-15:45

1 stop15h 40m

£565

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 1/9

11:40-14:00

Nonstop10h 20m

Seattle/Tacoma Intl

Tue 8/9

17:30-11:20

Nonstop9h 50m

£569

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 4/9

17:45-20:10

Nonstop10h 25m

Seattle/Tacoma Intl

Sat 19/9

21:50-15:35

Nonstop9h 45m

£571

Flights are sorted by cheapest return flights first.

Deals found on 1/8

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 return 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 £498). Flying from United Kingdom to Seattle in July is currently the most expensive (average of £656). 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 4 August 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 4 August 2026.

The most flights from GB0 to SEA are scheduled on a Monday (24 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (17 on average).

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

About 11% 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 Friday 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 past 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 83 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 4 August 2026.
Read reviews from past customers who have flown with Alaska Airlines,Virgin Atlantic, andAer Lingus from the United Kingdom to Seattle. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
7.9
Good
12,760 reviews
Check prices

Food

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Entertainment

7.0

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
12,760 reviews
Alaska Airlines
7.9
Good
12,760 reviews
Check prices

Food

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Entertainment

7.0

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
12,760 reviews
Check prices

Food

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Entertainment

7.0

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.
Aer Lingus
7.3
Good
1,685 reviews
Alaska Airlines
7.9
Good
12,760 reviews
Check prices

Food

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Entertainment

7.0

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
6.9
Okay
720 reviews
Alaska Airlines
7.9
Good
12,760 reviews
Check prices

Food

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Entertainment

7.0

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
8,149 reviews
Alaska Airlines
7.9
Good
12,760 reviews
Check prices

Food

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Entertainment

7.0

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?

    A quick flight from United Kingdom to Seattle can take about 13h. Icelandair provides one of the quickest options available for as low as £510. Airlines will cover a distance of 4807 mi. Both multi-stop and direct flights can be found to your destination and back.

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

    For one-way options, check prices for British Airways. According to our data, you can fly for as low as £315. Users have also found prices from £352 and £366 on Icelandair and Virgin Atlantic, respectively.

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

    The most popular flight routes from United Kingdom to Seattle are London Heathrow - Seattle/Tacoma Intl, London Gatwick - Seattle/Tacoma Intl and London Stansted - Seattle/Tacoma Intl.

  • 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 (85%), KLM (77%) and Air France (77%).

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

    Looking for the cheapest flight from United Kingdom to Seattle? While on average our users pay £1,819, our data indicates the cheapest price to be £379. The most popular route (London Heathrow - Seattle/Tacoma Intl), is priced around £412.

  • 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 holiday 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 £498). Flying from United Kingdom to Seattle in July is currently the most expensive (average of £656). 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

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Federal Way
SeaTac

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Top 10 airlines flying from United Kingdom to Seattle

Discover the top 10 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 858,174 searches. Data last updated 4 August 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£269Average£684FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
LufthansaCheapest£334Average£557FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IcelandairCheapest£340Average£558FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
British AirwaysCheapest£362Average£641FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Aer LingusCheapest£390Average£699FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
United AirlinesCheapest£429Average£655FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
KLMCheapest£433Average£637FlexibilityNo cancel feeOn-time75%
Search KLM flights
DeltaCheapest£440Average£636FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air FranceCheapest£449Average£731FlexibilityNo cancel feeOn-time77%
Search Air France flights
FinnairCheapest£460Average£669FlexibilityNo cancel feeOn-time76%
Search Finnair flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from United Kingdom to Seattle?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from United Kingdom to Seattle. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from United Kingdom to Seattle?

Cheapflights helps you find that perfect flight to Seattle from United Kingdom by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from United Kingdom to Seattle with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from United Kingdom to Seattle, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from United Kingdom to Seattle become cheaper?

Yes! Start tracking prices for United Kingdom to Seattle flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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