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$303+ Cheap flights from Seattle (SEA) to the United Kingdom

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 12/21. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LHR
Jan 13 — Jan 201
Tue 1/13
Tue 1/20
1 adult, Economy
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Cheap flight deals from Seattle to United Kingdom

Cheapest flights from Seattle to United Kingdom
Explore the most affordable flight options available from Seattle to United Kingdom. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 14, 2025.

This FlightHub deal was found by Cheapflights users on 12/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/302:35 pmSEA - MAN
1 stop12h 10mIcelandair
Thu 2/2611:55 amMAN - SEA
1 stop13h 05mIcelandair
Deal found 12/13$597
This CrystalTravel deal was found by Cheapflights users on 12/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/302:35 pmSEA - LHR
1 stop12h 15mIcelandair
Tue 1/1312:15 pmLHR - SEA
1 stop12h 45mIcelandair
Deal found 12/12$605
This Icelandair deal was found by Cheapflights users on 12/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/292:35 pmSEA - MAN
1 stop12h 10mIcelandair
Sat 2/2811:55 amMAN - SEA
1 stop13h 05mIcelandair
Deal found 12/13$620
This Cheapflightsfares deal was found by Cheapflights users on 12/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/313:10 pmSEA - MAN
1 stop17h 45mLufthansa
Thu 2/2611:15 amMAN - SEA
2 stops19h 28mLufthansa
Deal found 12/13$688
This Cheapflightsfares deal was found by Cheapflights users on 12/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3110:05 amSEA - LHR
2 stops16h 05mLufthansa
Mon 1/126:30 pmLHR - SEA
2 stops31h 44mLufthansa
Deal found 12/12$705
This Delta deal was found by Cheapflights users on 12/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/312:05 pmSEA - MAN
1 stop18h 00mDelta
Mon 2/239:05 amMAN - SEA
1 stop34h 35mDelta
Deal found 12/13$714
This Cheapflightsfares deal was found by Cheapflights users on 12/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/306:50 pmSEA - LHR
Nonstop9h 30mBritish Airways
Tue 1/139:25 amLHR - SEA
Nonstop10h 05mBritish Airways
Deal found 12/12$717
This Delta deal was found by Cheapflights users on 12/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/293:05 pmSEA - MAN
1 stop22h 55mDelta
Mon 2/239:05 amMAN - SEA
1 stop34h 35mDelta
Deal found 12/13$720
This Gotogate deal was found by Cheapflights users on 12/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/308:10 amSEA - LHR
1 stop16h 20mMultiple Airlines
Tue 1/133:00 pmLHR - SEA
2 stops15h 06mMultiple Airlines
Deal found 12/12$721
This United Airlines deal was found by Cheapflights users on 12/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/308:10 amSEA - LHR
2 stops28h 25mUnited Airlines
Tue 1/136:30 amLHR - SEA
2 stops23h 46mUnited Airlines
Deal found 12/12$729
This Cheapflightsfares deal was found by Cheapflights users on 12/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/263:40 pmSEA - LHR
1 stop12h 10mLufthansa
Fri 1/236:35 amLHR - SEA
2 stops20h 41mLufthansa
Deal found 12/12$740
This KAYAK deal was found by Cheapflights users on 12/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/313:10 pmSEA - MAN
1 stop17h 45mMultiple Airlines
Fri 2/279:10 amMAN - SEA
2 stops21h 33mMultiple Airlines
Deal found 12/13$745

Find flight deals from Seattle to United Kingdom

Keep the following information in mind while searching for Seattle to United Kingdom flight deals. Data was last updated December 14, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$474
(CrystalTravel)

One-way from

$303
(Kiwi.com)

Popular in

June

Cheapest in

November

Average price

$986

Good round-trip deal

$643 or less

Good one-way deal

$379 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-London (LON) flights.
Search Deals
From Seattle/Tacoma Intl to United Kingdom
Search Deals
One-way flight from Seattle/Tacoma Intl to United Kingdom
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($139 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($23 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Seattle/Tacoma Intl to United Kingdom.
Search Deals
Price to beat on a one-way flight from Seattle/Tacoma Intl to United Kingdom.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to United Kingdom 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 2,558,603 searches. Data last updated December 14, 2025.
Use the filters below to find and compare flights from Seattle to the United Kingdom that are best for you.

Fly from

Seattle

Fly to

United Kingdom

Route

Depart

Return

Price

SeattleGlasgow

SEA - GLA

SEAGLA

Seattle/Tacoma Intl

Thu 2/19

2:35 pm-9:55 am

1 stop11h 20m

Glasgow Intl

Sat 2/28

12:35 pm-5:00 pm

1 stop12h 25m

$474

SeattleGlasgow

SEA - GLA

SEAGLA

Seattle/Tacoma Intl

Thu 1/15

2:35 pm-9:55 am

1 stop11h 20m

Glasgow Intl

Thu 1/29

11:15 am-5:00 pm

1 stop13h 45m

$487

SeattleGlasgow

SEA - GLA

SEAGLA

Seattle/Tacoma Intl

Tue 2/3

2:35 pm-9:55 am

1 stop11h 20m

Glasgow Intl

Wed 2/11

12:35 pm-5:00 pm

1 stop12h 25m

$490

SeattleGlasgow

SEA - GLA

SEAGLA

Seattle/Tacoma Intl

Sun 1/11

2:35 pm-9:55 am

1 stop11h 20m

Glasgow Intl

Wed 1/21

12:35 pm-5:00 pm

1 stop12h 25m

$491

SeattleManchester

SEA - MAN

SEAMAN

Seattle/Tacoma Intl

Thu 3/5

2:35 pm-10:45 am

1 stop12h 10m

Manchester

Mon 3/9

11:55 am-6:00 pm

1 stop13h 05m

$496

SeattleNewcastle upon Tyne

SEA - NCL

SEANCL

Seattle/Tacoma Intl

Fri 1/9

2:35 pm-11:15 pm

2 stops24h 40m

Newcastle upon Tyne

Thu 1/22

10:30 pm-5:00 pm

2 stops26h 30m

$570

SeattleGlasgow

SEA - GLA

SEAGLA

Seattle/Tacoma Intl

Tue 1/27

6:50 pm-3:50 pm

1 stop13h 00m

Glasgow Intl

Tue 2/3

10:50 am-4:55 pm

1 stop14h 05m

$583

SeattleGlasgow

SEA - GLA

SEAGLA

Seattle/Tacoma Intl

Sat 2/7

1:35 pm-1:20 pm

1 stop15h 45m

Glasgow Intl

Sat 2/14

11:40 am-4:55 pm

1 stop13h 15m

$583

SeattleGlasgow

SEA - GLA

SEAGLA

Seattle/Tacoma Intl

Fri 2/20

6:50 pm-6:00 pm

1 stop15h 10m

Glasgow Intl

Sat 2/28

10:30 am-4:55 pm

1 stop14h 25m

$588

SeattleEdinburgh

SEA - EDI

SEAEDI

Seattle/Tacoma Intl

Wed 3/4

6:50 pm-5:05 pm

1 stop14h 15m

Edinburgh Turnhouse

Wed 3/11

6:25 am-5:55 pm

1 stop18h 30m

$590

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/14

Showing 1-10 of 60 results
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Best time to book a flight from Seattle to United Kingdom

Have a flexible travel schedule? Discover the best time to fly to United Kingdom from Seattle with our price prediction graph.
Estimated round-trip 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 Seattle to the United Kingdom

What is the cheapest month to book a flight from Seattle to United Kingdom?

Currently, January is the cheapest month in which you can book a flight from Seattle to United Kingdom (average of $449). Flying from Seattle to United Kingdom in June is currently the most expensive (average of $649). 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 SEA to GB?

Find hourly flight availability from Seattle to United Kingdom. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 14, 2025.

A simple way to save on the total cost of your ticket is to fly from Seattle to United Kingdom in the afternoon. If you’re flexible enough to do this you can expect to save up to 8% on your trip compared to booking a flight in the evening.

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

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

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

Weekly flight availability from Seattle to United Kingdom

Explore weekly flight availability from Seattle to United Kingdom. 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 December 14, 2025.

The most flights from SEA to GB0 are scheduled on a Saturday (21 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (6 on average).

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

About 16% of weekly flights between Seattle and United Kingdom have experienced delays in the past year, with the average delay time being 123 minutes.

What is the most punctual flight time for Seattle to the United Kingdom flights?

Historically, flights departing in the early afternoon are less likely to be delayed, whereas flights leaving at night 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 Sunday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on Seattle to the United Kingdom flights?

Over the last year, Virgin Atlantic have had the lowest number of delays on this route, with just 6% of flights being delayed.

Reviews of airlines servicing United Kingdom

Get insights into the airlines that provide service to United Kingdom. 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 United Kingdom. Reviews last updated December 14, 2025.
Read reviews from past customers who have flown Delta, Virgin Atlantic, and Icelandair from Seattle to the United Kingdom. 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
7.9
Good
8,008 reviews

Food

7.3

Comfort

7.9

Entertainment

7.9

Overall

7.9

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,008 reviews
Delta
7.9
Good
8,008 reviews

Food

7.3

Comfort

7.9

Entertainment

7.9

Overall

7.9

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Virgin Atlantic
7.5
Good
675 reviews
Delta
7.9
Good
8,008 reviews

Food

7.3

Comfort

7.9

Entertainment

7.9

Overall

7.9

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Icelandair
7.0
Good
590 reviews
Delta
7.9
Good
8,008 reviews

Food

7.3

Comfort

7.9

Entertainment

7.9

Overall

7.9

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Iberia
7.0
Good
3,051 reviews
Delta
7.9
Good
8,008 reviews

Food

7.3

Comfort

7.9

Entertainment

7.9

Overall

7.9

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
British Airways
6.7
Okay
7,574 reviews
Delta
7.9
Good
8,008 reviews

Food

7.3

Comfort

7.9

Entertainment

7.9

Overall

7.9

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

Related info for your journey

Find useful and relevant information for your journey from Seattle to United Kingdom. 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 from for flights from Seattle to United Kingdom?

    Located just 11.4 mi from the city center, Seattle/Tacoma Intl (SEA) is the airport most travelers will use when flying to United Kingdom from Seattle.

  • How long is the flight from Seattle to United Kingdom?

    A quick flight from Seattle to United Kingdom can take about 9h 30m. Icelandair provides one of the quickest options available for as low as $614. Seattle and United Kingdom are separated by a distance of 4783 mi. This flight may include one or multiple stops.

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

    The cheapest airlines for a one-way flight from Seattle to United Kingdom are Icelandair ($166), JetBlue ($181), and WestJet ($222).

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

    While some choose either Seattle/Tacoma Intl - London Gatwick or Seattle/Tacoma Intl - London City, Seattle/Tacoma Intl - London Heathrow is the most popular route from Seattle to United Kingdom.

  • What are the most reliable airlines from Seattle to United Kingdom?

    Consider KLM (87%), Delta (85%) or Virgin Atlantic (85%) when booking your flight. These represent the most reliable airlines when flying from Seattle to United Kingdom.

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

    On average you can expect to pay $2,146 for a flight from Seattle to United Kingdom. The cheapest flight overall is $336 while the most popular route, (Seattle/Tacoma Intl - London Heathrow) is currently priced at $490.

  • Can I find deals for flights from Seattle to United Kingdom that include hotel bookings?

    Yes. In addition to deals on Seattle to United Kingdom flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to United Kingdom?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to United Kingdom.

  • Can I find deals for business class flights from Seattle to United Kingdom?

    Yes. Cheapflights offers flight deals from Seattle to United Kingdom 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 Seattle to United Kingdom?

    Currently, January is the cheapest month in which you can book a flight from Seattle to United Kingdom (average of $449). Flying from Seattle to United Kingdom in June is currently the most expensive (average of $649). 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.

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Top 10 airlines flying from Seattle to United Kingdom

Discover the top 10 airlines that operate flights from Seattle to United Kingdom. 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 2,558,603 searches. Data last updated December 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$213Average$1,004FlexibilityNo cancel feeOn-time62%
Scandinavian AirlinesCheapest$465Average$718FlexibilityNo cancel feeOn-time77%
IcelandairCheapest$481Average$698FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$500Average$883FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$517Average$840FlexibilityNo cancel feeOn-time71%
Air FranceCheapest$532Average$844FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$543Average$942FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$547Average$828FlexibilityNo cancel feeOn-time69%
Virgin AtlanticCheapest$552Average$798FlexibilityNo cancel feeOn-time72%
Alaska AirlinesCheapest$553Average$989FlexibilityNo cancel feeOn-time75%

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