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Cheap flights from the United Kingdom to Seattle from £257

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 5/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
10 Feb — 17 Feb1
1 adult
1 adult, Economy, 0 bags

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 January 2026.

Round-trip from

£316

One-way from

£257

Popular in

July

Cheapest in

January

Average price

£480

Good round-trip deal

£465 or less

Good one-way deal

£460 or less
Icelandair
  • Icelandair
  • 6/3-17/3
  • 2 total stops
  • 23h 45m total
  • United Kingdom to Seattle
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5/5
  • 5/5
  • 3 total stops
  • 32h 49m total
  • United Kingdom to Seattle
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (£61 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).
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Average for round-trip flights in January 2026
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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

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 11 January 2026.

Fri 6/312:35GLA - SEA
1 stop12h 25mIcelandair
Tue 17/315:35SEA - GLA
1 stop11h 20mIcelandair
Deal found 10/1£316
Fri 6/312:35GLA - SEA
1 stop12h 25mIcelandair
Mon 16/315:35SEA - GLA
1 stop11h 20mIcelandair
Deal found 10/1£319
Mon 9/308:55GLA - SEA
1 stop16h 00mBritish Airways
Thu 19/319:50SEA - GLA
1 stop15h 00mBritish Airways
Deal found 10/1£362
Wed 11/311:40GLA - SEA
1 stop13h 15mBritish Airways
Wed 18/319:50SEA - GLA
1 stop13h 00mBritish Airways
Deal found 10/1£363
Wed 1/405:55EDI - SEA
1 stop13h 40mBritish Airways
Wed 29/413:35SEA - EDI
1 stop12h 05mBritish Airways
Deal found 9/1£369
Mon 9/309:45GLA - SEA
1 stop15h 10mBritish Airways
Sun 15/319:50SEA - GLA
1 stop13h 50mBritish Airways
Deal found 10/1£376
Wed 11/308:40GLA - SEA
1 stop16h 15mBritish Airways
Sun 15/319:50SEA - GLA
1 stop13h 50mBritish Airways
Deal found 10/1£377
Sat 7/308:40GLA - SEA
1 stop16h 15mBritish Airways
Wed 18/319:50SEA - GLA
1 stop13h 00mBritish Airways
Deal found 10/1£383
Fri 6/310:40GLA - SEA
1 stop14h 15mBritish Airways
Thu 19/319:50SEA - GLA
1 stop13h 50mBritish Airways
Deal found 10/1£384
Fri 6/308:15GLA - SEA
1 stop16h 40mBritish Airways
Wed 18/319:50SEA - GLA
1 stop13h 00mBritish Airways
Deal found 10/1£385
Fri 18/909:25LGW - SEA
2 stops21h 04mSWISS
Tue 13/1011:00SEA - LGW
2 stops37h 20mSWISS
Deal found 9/1£391
Mon 23/209:15LCY - SEA
2 stops19h 46mSWISS
Mon 2/312:32SEA - LCY
2 stops20h 33mSWISS
Deal found 8/1£391

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 January 2026.
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

Thu 12/3

12:35-18:00

1 stop12h 25m

Seattle/Tacoma Intl

Tue 17/3

15:35-09:55

1 stop11h 20m

£316

GlasgowSeattle

GLA - SEA

GLASEA

Glasgow Intl

Mon 9/3

12:35-18:00

1 stop12h 25m

Seattle/Tacoma Intl

Tue 17/3

15:35-09:55

1 stop11h 20m

£316

GlasgowSeattle

GLA - SEA

GLASEA

Glasgow Intl

Tue 10/3

12:35-18:00

1 stop12h 25m

Seattle/Tacoma Intl

Tue 17/3

15:35-09:55

1 stop11h 20m

£316

GlasgowSeattle

GLA - SEA

GLASEA

Glasgow Intl

Sun 8/3

12:35-18:00

1 stop12h 25m

Seattle/Tacoma Intl

Tue 17/3

15:35-09:55

1 stop11h 20m

£316

GlasgowSeattle

GLA - SEA

GLASEA

Glasgow Intl

Wed 11/3

12:35-18:00

1 stop12h 25m

Seattle/Tacoma Intl

Tue 17/3

15:35-09:55

1 stop11h 20m

£316

GlasgowSeattle

GLA - SEA

GLASEA

Glasgow Intl

Fri 6/3

12:35-17:00

1 stop12h 25m

Seattle/Tacoma Intl

Tue 17/3

15:35-09:55

1 stop11h 20m

£316

GlasgowSeattle

GLA - SEA

GLASEA

Glasgow Intl

Tue 10/3

08:55-17:55

1 stop16h 00m

Seattle/Tacoma Intl

Wed 18/3

19:50-18:15

1 stop15h 25m

£362

GlasgowSeattle

GLA - SEA

GLASEA

Glasgow Intl

Mon 9/3

08:55-17:55

1 stop16h 00m

Seattle/Tacoma Intl

Thu 19/3

19:50-17:50

1 stop15h 00m

£362

LondonSeattle

LCY - SEA

LCYSEA

London City

Mon 23/2

09:15-21:01

2 stops19h 46m

Seattle/Tacoma Intl

Mon 2/3

12:32-17:05

2 stops20h 33m

£391

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 20/5

09:00-16:59

1 stop15h 59m

Seattle/Tacoma Intl

Sun 24/5

15:51-12:20

1 stop12h 29m

£393

Flights are sorted by cheapest return flights first.

Deals found on 9/1

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 £303). Flying from United Kingdom to Seattle in August is currently the most expensive (average of £460). 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 January 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 11 January 2026.

The most flights from GB0 to SEA are scheduled on a Saturday (21 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (11 on average).

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

About 13% of weekly flights between United Kingdom and Seattle have experienced delays in the past year, with the average delay time being 117 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?

Tuesday tends to have the lowest number of delays on this route, whereas Wednesday 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 6% of flights being delayed.

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 January 2026.
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
1,435 reviews
Check prices

Boarding

7.8

Entertainment

7.1

Crew

8.4

Food

7.2

Overall

7.7

Comfort

7.6

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
KLM
7.7
Good
1,435 reviews
KLM
7.7
Good
1,435 reviews
Check prices

Boarding

7.8

Entertainment

7.1

Crew

8.4

Food

7.2

Overall

7.7

Comfort

7.6

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
Virgin Atlantic
7.5
Good
678 reviews
KLM
7.7
Good
1,435 reviews
Check prices

Boarding

7.8

Entertainment

7.1

Crew

8.4

Food

7.2

Overall

7.7

Comfort

7.6

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
Air France
7.4
Good
1,519 reviews
KLM
7.7
Good
1,435 reviews
Check prices

Boarding

7.8

Entertainment

7.1

Crew

8.4

Food

7.2

Overall

7.7

Comfort

7.6

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
Icelandair
7.1
Good
595 reviews
KLM
7.7
Good
1,435 reviews
Check prices

Boarding

7.8

Entertainment

7.1

Crew

8.4

Food

7.2

Overall

7.7

Comfort

7.6

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
British Airways
6.7
Okay
7,667 reviews
KLM
7.7
Good
1,435 reviews
Check prices

Boarding

7.8

Entertainment

7.1

Crew

8.4

Food

7.2

Overall

7.7

Comfort

7.6

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.

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 12h 25m. Icelandair provides one of the quickest options available for as low as £316. Airlines will cover a distance of 4445 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 WestJet. According to our data, you can fly for as low as £252. Users have also found prices from £344 and £346 on British Airways 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 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 (95%) and Air France (95%).

  • 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 £1,667, our data indicates the cheapest price to be £384. The most popular route (London Heathrow - Seattle/Tacoma Intl), is priced around £323.

  • 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 £303). Flying from United Kingdom to Seattle in August is currently the most expensive (average of £460). 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
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 January 2026.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£352Average£545FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
British AirwaysCheapest£363Average£567FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LufthansaCheapest£368Average£568FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Air FranceCheapest£387Average£714FlexibilityNo cancel feeOn-time77%
Search Air France flights
KLMCheapest£397Average£604FlexibilityNo cancel feeOn-time75%
Search KLM flights
Aer LingusCheapest£418Average£770FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Air CanadaCheapest£421Average£499FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest£423Average£630FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
FinnairCheapest£428Average£573FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Virgin AtlanticCheapest£432Average£648FlexibilityNo 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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