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Cheap flights from the United Kingdom to Seattle from £232

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 20/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
16 Jul — 23 Jul1
1 adult

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 11 July 2025.

Round-trip from

£474

One-way from

£232

Popular in

August

Cheapest in

January

Average price

£723

Good round-trip deal

£529 or less

Good one-way deal

£711 or less
SWISS
  • SWISS
  • 6/9-23/9
  • 4 total stops
  • 69h 02m total
  • United Kingdom to Seattle
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20/10
  • 20/10
  • 2 total stops
  • 35h 04m total
  • United Kingdom to Seattle
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£73 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£12 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from United Kingdom to Seattle/Tacoma Intl.
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Price to beat on a one-way flight from United Kingdom to Seattle/Tacoma Intl.
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Find 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 11 July 2025.

Sat 6/920:05LHR - SEA
2 stops30h 31mSWISS
Mon 22/914:29SEA - LHR
2 stops20h 51mSWISS
Deal found 9/7£474
Tue 25/1112:15LHR - SEA
1 stop12h 45mIcelandair
Mon 23/214:35SEA - LHR
1 stop12h 15mIcelandair
Deal found 10/7£475
Sat 6/918:40LGW - SEA
2 stops31h 56mSWISS
Tue 21/1013:00SEA - LGW
2 stops20h 50mSWISS
Deal found 10/7£476
Fri 12/906:30LHR - SEA
2 stops15h 46mMultiple Airlines
Sun 14/905:30SEA - LHR
2 stops17h 00mMultiple Airlines
Deal found 9/7£477
Mon 25/812:10LGW - SEA
1 stop17h 49mJetBlue
Tue 9/911:30SEA - LGW
1 stop14h 05mJetBlue
Deal found 9/7£478
Tue 5/815:40LGW - SEA
1 stop13h 00mIcelandair
Wed 3/915:45SEA - LGW
1 stop12h 00mIcelandair
Deal found 10/7£478
Tue 25/1119:25LHR - SEA
2 stops31h 27mAustrian Airlines
Mon 23/208:00SEA - LHR
1 stop18h 50mAustrian Airlines
Deal found 10/7£478
Wed 27/817:25LHR - SEA
Nonstop10h 20mVirgin Atlantic
Tue 9/920:25SEA - LHR
Nonstop9h 50mVirgin Atlantic
Deal found 9/7£480
Sat 6/906:30LHR - SEA
1 stop13h 25mLufthansa
Mon 22/914:00SEA - LHR
1 stop13h 45mLufthansa
Deal found 9/7£481
Sun 19/1006:30LHR - SEA
2 stops15h 46mUnited Airlines
Sun 2/1119:13SEA - LHR
2 stops18h 07mUnited Airlines
Deal found 10/7£485
Sat 6/909:20LCY - SEA
1 stop13h 30mSWISS
Mon 22/915:19SEA - LCY
2 stops19h 26mSWISS
Deal found 9/7£487
Wed 27/818:05LHR - SEA
2 stops51h 45mScandinavian Airlines
Mon 8/916:00SEA - LHR
1 stop17h 40mScandinavian Airlines
Deal found 10/7£488

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 11 July 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

LHR - SEA

LHRSEA

London Heathrow

Sat 6/9

20:05-18:36

2 stops30h 31m

Seattle/Tacoma Intl

Mon 22/9

14:29-19:20

2 stops20h 51m

£474

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 25/11

12:15-17:00

1 stop12h 45m

Seattle/Tacoma Intl

Wed 25/2

14:35-19:30

1 stop20h 55m

£475

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Sat 6/9

18:40-18:36

2 stops31h 56m

Seattle/Tacoma Intl

Tue 21/10

13:00-17:50

2 stops20h 50m

£476

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 12/9

06:30-14:16

2 stops15h 46m

Seattle/Tacoma Intl

Sun 14/9

05:30-06:30

2 stops17h 00m

£477

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Mon 25/8

12:10-21:59

1 stop17h 49m

Seattle/Tacoma Intl

Tue 9/9

11:30-09:35

1 stop14h 05m

£478

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 25/11

19:25-18:52

2 stops31h 27m

Seattle/Tacoma Intl

Mon 23/2

08:00-10:50

1 stop18h 50m

£478

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Tue 5/8

15:40-20:40

1 stop13h 00m

Seattle/Tacoma Intl

Wed 3/9

15:45-11:45

1 stop12h 00m

£478

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 27/8

17:25-19:45

Nonstop10h 20m

Seattle/Tacoma Intl

Tue 9/9

20:25-14:15

Nonstop9h 50m

£480

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 6/9

06:30-11:55

1 stop13h 25m

Seattle/Tacoma Intl

Mon 22/9

14:00-11:45

1 stop13h 45m

£481

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 19/10

06:30-14:16

2 stops15h 46m

Seattle/Tacoma Intl

Sun 2/11

23:59-07:30

1 stop23h 31m

£485

Flights are sorted by cheapest return flights first.

Deals found on 9/7

Showing 1-10 of 60 results
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6

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, January is the cheapest month in which you can book a flight from United Kingdom to Seattle (average of £622). Flying from United Kingdom to Seattle in July is currently the most expensive (average of £946). 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 11 July 2025.

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 11 July 2025.

The most flights from GB0 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 11 July 2025.
Read reviews from past customers who have flown with Delta, KLM, andAustrian Airlines 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.
Delta
8.0
Very Good
7,951 reviews
Check prices

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Delta
8.0
Very Good
7,951 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
KLM
7.8
Good
1,372 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Austrian Airlines
7.6
Good
811 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Finnair
7.6
Good
1,312 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
SWISS
7.5
Good
1,655 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.

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.

  • 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 £337. Users have also found prices from £404 and £435 on Aer Lingus and Icelandair, 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 Aeromexico (95%), KLM (93%) and Air France (93%).

  • 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 £2,160, our data indicates the cheapest price to be £464. The most popular route (London Heathrow - Seattle/Tacoma Intl), is priced around £428.

  • 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, January is the cheapest month in which you can book a flight from United Kingdom to Seattle (average of £622). Flying from United Kingdom to Seattle in July is currently the most expensive (average of £946). 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 the United Kingdom?

Book flights to the United Kingdom 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 11 July 2025.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest£7Average£764FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
IcelandairCheapest£321Average£546FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
United AirlinesCheapest£342Average£575FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air FranceCheapest£381Average£608FlexibilityNo cancel feeOn-time77%
Search Air France flights
LufthansaCheapest£381Average£556FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
FinnairCheapest£399Average£602FlexibilityNo cancel feeOn-time76%
Search Finnair flights
KLMCheapest£401Average£610FlexibilityNo cancel feeOn-time75%
Search KLM flights
British AirwaysCheapest£418Average£616FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Scandinavian AirlinesCheapest£436Average£640FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Virgin AtlanticCheapest£437Average£604FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic 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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