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Cheap flights from the United Kingdom to Seattle from £308

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 12/12. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
30 Nov — 7 Dec1
1 adult
1 adult, Economy, 0 bags

Find 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 31 October 2025.

Fri 7/1107:45MAN - SEA
2 stops17h 15mMultiple Airlines
Sun 16/1114:35SEA - MAN
2 stops23h 20mMultiple Airlines
Deal found 30/10£446
Fri 7/1107:55BHX - SEA
2 stops17h 05mMultiple Airlines
Sun 16/1114:35SEA - BHX
2 stops14h 15mMultiple Airlines
Deal found 30/10£451
Tue 16/1220:35LHR - SEA
1 stop28h 25mIcelandair
Wed 14/114:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 29/10£452
Tue 2/1220:35LHR - SEA
1 stop28h 25mIcelandair
Tue 9/1214:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 30/10£456
Wed 26/1112:15LHR - SEA
1 stop12h 45mIcelandair
Wed 3/1214:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 29/10£458
Wed 12/1111:55LGW - SEA
1 stop13h 05mIcelandair
Tue 18/1114:35SEA - LGW
1 stop12h 20mIcelandair
Deal found 30/10£464
Wed 12/1112:15LHR - SEA
1 stop12h 45mIcelandair
Wed 19/1114:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 30/10£467
Tue 11/1120:35LHR - SEA
1 stop28h 25mIcelandair
Mon 17/1114:35SEA - LHR
1 stop12h 15mIcelandair
Deal found 30/10£468
Tue 4/1120:35LHR - SEA
1 stop28h 25mIcelandair
Tue 11/1114:35SEA - LHR
1 stop12h 15mIcelandair
Deal found 29/10£469
Mon 17/1112:10LHR - SEA
1 stop14h 10mAer Lingus
Sun 30/1120:05SEA - LHR
1 stop11h 30mAer Lingus
Deal found 29/10£472
Thu 13/1120:35LHR - SEA
1 stop28h 25mIcelandair
Wed 26/1114:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 29/10£479
Tue 2/1220:35LHR - SEA
1 stop28h 25mIcelandair
Sat 6/1214:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 30/10£481

Cheap 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 31 October 2025.

Round-trip from

£452

One-way from

£308

Popular in

July

Cheapest in

January

Average price

£551

Good round-trip deal

£553 or less

Good one-way deal

£517 or less
Icelandair
  • Icelandair
  • 16/12-14/1
  • 2 total stops
  • 49h 20m total
  • United Kingdom to Seattle
Search Deals
12/12
  • 12/12
  • 3 total stops
  • 52h 33m total
  • United Kingdom to Seattle
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£59 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2025
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 31 October 2025.
Use the filters below to find and compare flights from the United Kingdom to Seattle that are best for you.

Fly from

United Kingdom

Fly to

Seattle

Route

Depart

Return

Price

LondonSeattle

LTN - SEA

LTNSEA

London Luton

Thu 4/12

06:00-17:00

1 stop19h 00m

Seattle/Tacoma Intl

Mon 8/12

14:35-14:00

1 stop15h 25m

£483

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 22/3

08:40-12:35

1 stop34h 55m

Seattle/Tacoma Intl

Mon 30/3

20:25-14:15

Nonstop9h 50m

£489

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 24/2

11:45-11:40

1 stop31h 55m

Seattle/Tacoma Intl

Wed 4/3

16:45-10:30

Nonstop9h 45m

£496

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 26/2

06:30-11:40

1 stop13h 10m

Seattle/Tacoma Intl

Mon 9/3

17:40-10:30

Nonstop9h 50m

£496

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Sun 22/3

11:55-18:00

1 stop13h 05m

Seattle/Tacoma Intl

Sat 28/3

19:00-14:40

1 stop11h 40m

£497

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 25/2

06:30-11:40

1 stop13h 10m

Seattle/Tacoma Intl

Fri 6/3

16:45-10:30

Nonstop9h 45m

£502

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 7/2

14:55-16:55

Nonstop10h 00m

Seattle/Tacoma Intl

Sun 22/2

07:00-06:50

1 stop15h 50m

£505

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 11/2

14:55-16:55

Nonstop10h 00m

Seattle/Tacoma Intl

Mon 23/2

18:50-12:20

Nonstop9h 30m

£505

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 16/12

10:05-18:55

1 stop16h 50m

Seattle/Tacoma Intl

Wed 14/1

18:50-12:20

Nonstop9h 30m

£506

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 22/2

12:20-14:45

Nonstop10h 25m

Seattle/Tacoma Intl

Mon 9/3

17:40-10:30

Nonstop9h 50m

£509

Flights are sorted by cheapest return flights first.

Deals found on 30/10

Showing 1-10 of 60 results
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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, March is the cheapest month in which you can book a flight from United Kingdom to Seattle (average of £311). Flying from United Kingdom to Seattle in August is currently the most expensive (average of £468). 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 31 October 2025.

One of the essential ways to save on airfare from United Kingdom to Seattle is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight at midday could potentially save you up to 11% on airfare.

What is the cheapest day to fly from United Kingdom to Seattle?

Use this chart to determine the cheapest time to fly return from United Kingdom to Seattle. Price data was last updated on 16 December 2024.

Travellers seeking maximum savings on their United Kingdom to Seattle flight should consider departing on Friday afternoons when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 31 October 2025.
Read reviews from past customers who have flown with KLM, Virgin Atlantic, andAir France 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.
KLM
7.7
Good
1,406 reviews
Check prices

Comfort

7.7

Entertainment

7.1

Food

7.3

Overall

7.7

Crew

8.4

Boarding

7.8

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
KLM
7.7
Good
1,406 reviews
KLM
7.7
Good
1,406 reviews
Check prices

Comfort

7.7

Entertainment

7.1

Food

7.3

Overall

7.7

Crew

8.4

Boarding

7.8

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Virgin Atlantic
7.5
Good
671 reviews
KLM
7.7
Good
1,406 reviews
Check prices

Comfort

7.7

Entertainment

7.1

Food

7.3

Overall

7.7

Crew

8.4

Boarding

7.8

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Air France
7.4
Good
1,482 reviews
KLM
7.7
Good
1,406 reviews
Check prices

Comfort

7.7

Entertainment

7.1

Food

7.3

Overall

7.7

Crew

8.4

Boarding

7.8

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Icelandair
7.1
Good
562 reviews
KLM
7.7
Good
1,406 reviews
Check prices

Comfort

7.7

Entertainment

7.1

Food

7.3

Overall

7.7

Crew

8.4

Boarding

7.8

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
British Airways
6.7
Okay
7,489 reviews
KLM
7.7
Good
1,406 reviews
Check prices

Comfort

7.7

Entertainment

7.1

Food

7.3

Overall

7.7

Crew

8.4

Boarding

7.8

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

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 10h. Delta provides one of the quickest options available for as low as £505. Airlines will cover a distance of 4783 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 United Airlines. According to our data, you can fly for as low as £426. Users have also found prices from £430 and £433 on Finnair and Lufthansa, 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 City - 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 (95%), KLM (87%) and Air France (87%).

  • 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 £1,564, our data indicates the cheapest price to be £429. The most popular route (London Heathrow - Seattle/Tacoma Intl), is priced around £398.

  • 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, March is the cheapest month in which you can book a flight from United Kingdom to Seattle (average of £311). Flying from United Kingdom to Seattle in August is currently the most expensive (average of £468). 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
Tacoma
Leavenworth
Bothell
SeaTac

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Alternative routes for United Kingdom to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
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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 31 October 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£332Average£563FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£393Average£737FlexibilityNo cancel feeOn-time77%
Search Air France flights
FinnairCheapest£405Average£607FlexibilityNo cancel feeOn-time76%
Search Finnair flights
LufthansaCheapest£407Average£593FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
KLMCheapest£411Average£623FlexibilityNo cancel feeOn-time75%
Search KLM flights
United AirlinesCheapest£413Average£641FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
British AirwaysCheapest£431Average£628FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Scandinavian AirlinesCheapest£449Average£648FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Virgin AtlanticCheapest£450Average£633FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
DeltaCheapest£453Average£650FlexibilityNo cancel feeOn-timeN/A
Search Delta 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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