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$310+ 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 11/20. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LHR
Nov 28 — Dec 51
Fri 11/28
Fri 12/5
1 adult, Economy
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Find 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 October 29, 2025.

This oojo deal was found by Cheapflights users on 10/28. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/12:35 pmSEA - EDI
1 stop11h 45mIcelandair
Fri 12/511:30 amEDI - SEA
1 stop13h 30mIcelandair
Deal found 10/28$491
This FlightHub deal was found by Cheapflights users on 10/26. 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.
Mon 11/102:35 pmSEA - GLA
1 stop11h 20mIcelandair
Fri 11/1412:35 pmGLA - SEA
1 stop12h 25mIcelandair
Deal found 10/26$492
This FlightHub deal was found by Cheapflights users on 10/26. 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.
Mon 11/102:35 pmSEA - EDI
1 stop11h 45mIcelandair
Fri 11/1411:30 amEDI - SEA
1 stop13h 30mIcelandair
Deal found 10/26$495
This oojo deal was found by Cheapflights users on 10/28. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/132:35 pmSEA - MAN
1 stop12h 10mIcelandair
Tue 11/1811:55 amMAN - SEA
1 stop13h 05mIcelandair
Deal found 10/28$496
This FlightHub deal was found by Cheapflights users on 10/28. 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.
Wed 11/122:35 pmSEA - MAN
1 stop12h 10mIcelandair
Wed 11/1911:55 amMAN - SEA
1 stop13h 05mIcelandair
Deal found 10/28$500
This Cheapflightsfares deal was found by Cheapflights users on 10/28. 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.
Mon 12/12:35 pmSEA - GLA
1 stop11h 20mIcelandair
Fri 12/512:35 pmGLA - SEA
1 stop12h 25mIcelandair
Deal found 10/28$505
This Mytrip deal was found by Cheapflights users on 10/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/272:35 pmSEA - EDI
2 stops23h 55mMultiple Airlines
Thu 12/47:45 amEDI - SEA
2 stops17h 15mMultiple Airlines
Deal found 10/29$508
This oojo deal was found by Cheapflights users on 10/28. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/272:35 pmSEA - GLA
1 stop11h 20mIcelandair
Thu 12/412:35 pmGLA - SEA
1 stop12h 25mIcelandair
Deal found 10/28$512
This FlightHub deal was found by Cheapflights users on 10/28. 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 11/42:35 pmSEA - LGW
1 stop12h 20mIcelandair
Thu 11/1311:55 amLGW - SEA
1 stop13h 05mIcelandair
Deal found 10/28$518
This oojo deal was found by Cheapflights users on 10/28. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/42:35 pmSEA - LHR
1 stop20h 55mIcelandair
Tue 11/118:35 pmLHR - SEA
1 stop28h 25mIcelandair
Deal found 10/28$519
This Icelandair deal was found by Cheapflights users on 10/28. 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.
Tue 12/22:35 pmSEA - LHR
1 stop12h 15mIcelandair
Sun 12/712:15 pmLHR - SEA
1 stop12h 45mIcelandair
Deal found 10/28$520
This Icelandair deal was found by Cheapflights users on 10/27. 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.
Tue 11/112:35 pmSEA - LHR
1 stop12h 15mIcelandair
Mon 11/178:35 pmLHR - SEA
1 stop28h 25mIcelandair
Deal found 10/27$521

Cheap 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 October 29, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$474
(CrystalTravel)

One-way from

$310
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$663

Good round-trip deal

$688 or less

Good one-way deal

$460 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 ($134 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 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 October 29, 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

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 11/26

2:35 pm-10:50 am

1 stop12h 15m

London Heathrow

Thu 12/4

12:15 pm-5:00 pm

1 stop12h 45m

$520

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sat 1/10

2:35 pm-10:50 am

1 stop12h 15m

London Heathrow

Mon 1/19

12:15 pm-5:00 pm

1 stop12h 45m

$520

SeattleManchester

SEA - MAN

SEAMAN

Seattle/Tacoma Intl

Sat 1/10

2:35 pm-10:45 am

1 stop12h 10m

Manchester

Wed 1/14

11:55 am-5:00 pm

1 stop13h 05m

$522

SeattleManchester

SEA - MAN

SEAMAN

Seattle/Tacoma Intl

Sun 1/11

2:35 pm-10:45 am

1 stop12h 10m

Manchester

Sat 1/17

11:55 am-5:00 pm

1 stop13h 05m

$522

SeattleManchester

SEA - MAN

SEAMAN

Seattle/Tacoma Intl

Sat 1/10

2:35 pm-10:45 am

1 stop12h 10m

Manchester

Sun 1/18

11:55 am-5:00 pm

1 stop13h 05m

$522

SeattleManchester

SEA - MAN

SEAMAN

Seattle/Tacoma Intl

Sun 1/11

2:35 pm-10:45 am

1 stop12h 10m

Manchester

Thu 1/15

11:55 am-5:00 pm

1 stop13h 05m

$522

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 12/3

4:48 pm-10:30 am

Nonstop9h 42m

London Heathrow

Wed 12/10

6:20 am-1:25 pm

1 stop15h 05m

$577

SeattleEdinburgh

SEA - EDI

SEAEDI

Seattle/Tacoma Intl

Mon 1/26

8:04 am-10:10 am

2 stops18h 06m

Edinburgh Turnhouse

Mon 2/2

7:20 pm-11:30 am

1 stop24h 10m

$578

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 11/12

4:48 pm-10:30 am

Nonstop9h 42m

London Heathrow

Mon 11/17

8:40 am-11:45 am

1 stop35h 05m

$578

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Mon 12/1

8:10 am-11:55 pm

2 stops31h 45m

London Stansted

Thu 12/11

4:05 pm-12:10 pm

2 stops28h 05m

$580

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

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, November is the cheapest month in which you can book a flight from Seattle to United Kingdom (average of $459). Flying from Seattle to United Kingdom in June is currently the most expensive (average of $653). 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 October 29, 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 7% 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 Saturday at noon 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.

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 October 29, 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
7,993 reviews

Comfort

7.9

Overall

7.9

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Delta
7.9
Good
7,993 reviews
Delta
7.9
Good
7,993 reviews

Comfort

7.9

Overall

7.9

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Virgin Atlantic
7.5
Good
670 reviews
Delta
7.9
Good
7,993 reviews

Comfort

7.9

Overall

7.9

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Icelandair
7.1
Good
562 reviews
Delta
7.9
Good
7,993 reviews

Comfort

7.9

Overall

7.9

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Iberia
7.0
Good
3,001 reviews
Delta
7.9
Good
7,993 reviews

Comfort

7.9

Overall

7.9

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
British Airways
6.7
Okay
7,485 reviews
Delta
7.9
Good
7,993 reviews

Comfort

7.9

Overall

7.9

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.

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 42m. Icelandair provides one of the quickest options available for as low as $577. 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 WestJet ($368), Icelandair ($376), and Aer Lingus ($376).

  • 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 (86%), Air France (86%) or Delta (86%) 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 $2,242 for a flight from Seattle to United Kingdom. The cheapest flight overall is $350 while the most popular route, (Seattle/Tacoma Intl - London Heathrow) is currently priced at $440.

  • 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, November is the cheapest month in which you can book a flight from Seattle to United Kingdom (average of $459). Flying from Seattle to United Kingdom in June is currently the most expensive (average of $653). 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 October 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$213Average$1,004FlexibilityNo cancel feeOn-time62%
Scandinavian AirlinesCheapest$465Average$741FlexibilityNo cancel feeOn-time77%
IcelandairCheapest$484Average$682FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$500Average$899FlexibilityNo cancel feeOn-timeN/A
Air FranceCheapest$517Average$847FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$518Average$801FlexibilityNo cancel feeOn-time71%
British AirwaysCheapest$546Average$966FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$547Average$896FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$553Average$999FlexibilityNo cancel feeOn-time75%
FinnairCheapest$556Average$694FlexibilityNo cancel feeOn-time76%

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