Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from the United Kingdom to Seattle from £243

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 22/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
22 Jul — 29 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 17 July 2025.

Round-trip from

£405

One-way from

£243

Popular in

August

Cheapest in

January

Average price

£709

Good round-trip deal

£552 or less

Good one-way deal

£669 or less
29/8-5/9
  • 29/8-5/9
  • 6 total stops
  • 53h 35m total
  • United Kingdom to Seattle
Search Deals
22/9
  • 22/9
  • 3 total stops
  • 45h 38m total
  • United Kingdom to Seattle
Search Deals
Highest demand for flights based on searches. 14% potential increase in price (£68 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
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

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 17 July 2025.

Fri 29/815:40GLA - SEA
3 stops30h 10mMultiple Airlines
Fri 5/916:00SEA - GLA
3 stops23h 25mMultiple Airlines
Deal found 15/7£405
Fri 29/815:40BRS - SEA
3 stops30h 10mMultiple Airlines
Fri 5/916:00SEA - BRS
3 stops23h 35mMultiple Airlines
Deal found 15/7£407
Fri 29/809:50EDI - SEA
3 stops36h 00mMultiple Airlines
Fri 5/916:00SEA - EDI
3 stops23h 10mMultiple Airlines
Deal found 15/7£410
Fri 29/818:20BHX - SEA
3 stops27h 30mMultiple Airlines
Fri 5/916:00SEA - BHX
3 stops21h 55mMultiple Airlines
Deal found 15/7£411
Thu 28/812:10LGW - SEA
1 stop17h 55mJetBlue
Thu 4/911:30SEA - LGW
1 stop14h 05mJetBlue
Deal found 13/7£481
Sat 30/814:00LGW - SEA
2 stops40h 29mMultiple Airlines
Sat 6/908:00SEA - LGW
1 stop18h 50mMultiple Airlines
Deal found 16/7£484
Sat 30/806:00LHR - SEA
1 stop16h 50mMultiple Airlines
Sat 6/912:00SEA - LHR
1 stop15h 50mMultiple Airlines
Deal found 15/7£484
Mon 11/815:40LGW - SEA
1 stop13h 00mIcelandair
Fri 22/819:00SEA - LGW
1 stop32h 45mIcelandair
Deal found 16/7£485
Sat 16/821:25LHR - SEA
1 stop22h 00mIcelandair
Sat 6/915:45SEA - LHR
1 stop12h 10mIcelandair
Deal found 15/7£485
Mon 1/915:05LHR - SEA
2 stops37h 37mAustrian Airlines
Mon 15/907:00SEA - LHR
2 stops18h 40mAustrian Airlines
Deal found 15/7£486
Mon 1/909:50LHR - SEA
Nonstop9h 45mFinnair
Sun 21/923:49SEA - LHR
1 stop22h 36mFinnair
Deal found 16/7£487
Sat 30/814:05LHR - SEA
1 stop14h 40mUnited Airlines
Sat 6/908:45SEA - LHR
1 stop16h 55mUnited Airlines
Deal found 15/7£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 17 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

GlasgowSeattle

GLA - SEA

GLASEA

Glasgow Intl

Fri 29/8

15:40-13:50

3 stops30h 10m

Seattle/Tacoma Intl

Fri 5/9

16:00-23:25

3 stops23h 25m

£405

BristolSeattle

BRS - SEA

BRSSEA

Bristol

Fri 29/8

15:40-13:50

3 stops30h 10m

Seattle/Tacoma Intl

Fri 5/9

16:00-23:35

3 stops23h 35m

£407

EdinburghSeattle

EDI - SEA

EDISEA

Edinburgh Turnhouse

Fri 29/8

09:50-13:50

3 stops36h 00m

Seattle/Tacoma Intl

Fri 5/9

16:00-23:10

3 stops23h 10m

£410

BirminghamSeattle

BHX - SEA

BHXSEA

Birmingham

Fri 29/8

18:20-13:50

3 stops27h 30m

Seattle/Tacoma Intl

Fri 5/9

16:00-21:55

3 stops21h 55m

£411

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Thu 28/8

12:10-22:05

1 stop17h 55m

Seattle/Tacoma Intl

Thu 4/9

11:30-09:35

1 stop14h 05m

£481

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Mon 11/8

15:40-20:40

1 stop13h 00m

Seattle/Tacoma Intl

Fri 22/8

19:00-11:45

1 stop32h 45m

£485

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 16/8

21:25-11:25

1 stop22h 00m

Seattle/Tacoma Intl

Sat 6/9

15:45-11:55

1 stop12h 10m

£485

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 1/9

15:05-20:42

2 stops37h 37m

Seattle/Tacoma Intl

Mon 15/9

07:00-09:40

2 stops18h 40m

£486

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 1/9

09:50-11:35

Nonstop9h 45m

Seattle/Tacoma Intl

Sun 21/9

23:49-06:25

1 stop22h 36m

£487

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 30/8

14:05-20:45

1 stop14h 40m

Seattle/Tacoma Intl

Sat 6/9

08:45-09:40

1 stop16h 55m

£488

Flights are sorted by cheapest return flights first.

Deals found on 15/7

Showing 1-10 of 60 results
1
2
3
...
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 17 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 17 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 17 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
7,957 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

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
7,957 reviews
Delta
8.0
Very Good
7,957 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

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
1,373 reviews
Delta
8.0
Very Good
7,957 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

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
814 reviews
Delta
8.0
Very Good
7,957 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

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
1,316 reviews
Delta
8.0
Very Good
7,957 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

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.
Air France
7.5
Good
1,466 reviews
Delta
8.0
Very Good
7,957 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

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 Aer Lingus. According to our data, you can fly for as low as £404. Users have also found prices from £416 and £421 on WestJet 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 £2,522, our data indicates the cheapest price to be £481. The most popular route (London Heathrow - Seattle/Tacoma Intl), is priced around £404.

  • 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 Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
Leavenworth
Bothell
SeaTac

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for United Kingdom to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
Heathrow to Seattle flights
Gatwick to Seattle flights
London City to Seattle flights
Heathrow to Portland flights
Luton to Seattle flights
Stansted to Seattle flights
Gatwick to Portland flights
Manchester to Seattle flights
London City to Portland flights
Manchester to Portland flights
Glasgow Intl to Seattle flights
Edinburgh to Seattle flights
Heathrow to Spokane flights
Stansted to Portland flights
Birmingham to Seattle flights
Gatwick to Spokane flights
Birmingham to Portland flights
London City to Spokane flights
Southend to Seattle flights
Bristol to Seattle flights
Glasgow Intl to Portland flights
Southampton to Seattle flights
Luton to Portland flights
Heathrow to Pasco flights
Leeds to Portland flights
Bristol to Portland flights
Manchester to Spokane flights
Edinburgh to Portland flights
Grimsby to Portland flights
Newcastle upon Tyne to Seattle flights
Edinburgh to Pasco flights
Amsterdam to Seattle flights
Frankfurt to Seattle flights
Dublin to Seattle flights
Munich to Seattle flights
Belfast Intl to Seattle flights
Newquay to Seattle flights
Oslo Gardermoen to Seattle flights
Madrid to Seattle flights
Leeds to Seattle flights
Copenhagen to Seattle flights
Belfast City to Seattle flights
Heathrow to Bellingham flights
Arlanda to Seattle flights

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 17 July 2025.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest£8Average£775FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
IcelandairCheapest£326Average£557FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£386Average£621FlexibilityNo cancel feeOn-time77%
Search Air France flights
LufthansaCheapest£386Average£566FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£393Average£574FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
FinnairCheapest£404Average£602FlexibilityNo cancel feeOn-time76%
Search Finnair flights
KLMCheapest£406Average£618FlexibilityNo cancel feeOn-time75%
Search KLM flights
British AirwaysCheapest£425Average£620FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£444Average£618FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
DeltaCheapest£445Average£641FlexibilityNo 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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
©2025 Cheapflights