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$266+ 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 7/27. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LHR
Apr 2 — Apr 91
Wed 4/2
Wed 4/9
1 adult, Economy
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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 March 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$593
(Kiwi.com)

One-way from

$267
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$687

Good round-trip deal

$721 or less

Good one-way deal

$496 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-London (LON) flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-London (LON) flights.
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From Seattle/Tacoma Intl to United Kingdom
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One-way flight from Seattle/Tacoma Intl to United Kingdom
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Highest demand for flights based on searches. 20% potential increase in price ($212 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($34 potential savings vs. average RT price).
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Average for round-trip flights in March 2025
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Price to beat on a round-trip flight from Seattle/Tacoma Intl to United Kingdom.
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Price to beat on a one-way flight from Seattle/Tacoma Intl to United Kingdom.
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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 March 28, 2025.

This Kiwi.com deal was found by Cheapflights users on 3/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/197:00 pmSEA - LGW
1 stop11h 35mMultiple Airlines
Tue 6/38:55 pmLGW - SEA
2 stops31h 33mMultiple Airlines
Deal found 3/27$593
This Icelandair deal was found by Cheapflights users on 3/28. 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 5/67:00 pmSEA - LGW
1 stop11h 40mIcelandair
Fri 5/163:40 pmLGW - SEA
1 stop13h 00mIcelandair
Deal found 3/28$594
This Gotogate deal was found by Cheapflights users on 3/26. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1111:30 pmSEA - LHR
1 stop28h 25mIcelandair
Wed 9/179:25 pmLHR - SEA
1 stop31h 15mIcelandair
Deal found 3/26$597
This Mytrip deal was found by Cheapflights users on 3/27. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/297:00 pmSEA - MAN
1 stop32h 40mMultiple Airlines
Tue 5/69:05 amMAN - SEA
2 stops19h 23mMultiple Airlines
Deal found 3/27$602
This Scandinavian Airlines deal was found by Cheapflights users on 3/27. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/214:20 pmSEA - LHR
1 stop21h 20mScandinavian Airlines
Wed 10/16:40 amLHR - SEA
1 stop15h 20mScandinavian Airlines
Deal found 3/27$606
This oojo deal was found by Cheapflights users on 3/27. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/127:00 pmSEA - GLA
1 stop10h 25mIcelandair
Sun 10/192:20 pmGLA - SEA
1 stop14h 20mIcelandair
Deal found 3/27$609
This Kiwi.com deal was found by Cheapflights users on 3/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/187:00 pmSEA - LHR
1 stop17h 20mMultiple Airlines
Wed 5/289:25 pmLHR - SEA
2 stops23h 33mMultiple Airlines
Deal found 3/27$610
This Mytrip deal was found by Cheapflights users on 3/27. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/243:45 pmSEA - STN
2 stops17h 40mMultiple Airlines
Mon 4/286:10 amSTN - SEA
2 stops19h 40mMultiple Airlines
Deal found 3/27$614
This Gotogate deal was found by Cheapflights users on 3/27. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/297:00 pmSEA - MAN
1 stop32h 40mIcelandair
Tue 5/61:05 pmMAN - SEA
1 stop15h 35mIcelandair
Deal found 3/27$616
This Iberia deal was found by Cheapflights users on 3/26. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/131:30 pmSEA - LHR
Nonstop9h 20mIberia
Wed 4/309:50 amLHR - SEA
Nonstop9h 45mIberia
Deal found 3/26$632
This Gotogate deal was found by Cheapflights users on 3/27. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/84:00 pmSEA - MAN
1 stop33h 30mScandinavian Airlines
Sun 8/319:20 amMAN - SEA
2 stops36h 30mScandinavian Airlines
Deal found 3/27$641
This Flightnetwork deal was found by Cheapflights users on 3/27. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/276:00 amSEA - LHR
1 stop16h 35mAir Canada
Tue 5/136:00 amLHR - SEA
2 stops20h 33mAir Canada
Deal found 3/27$641

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 March 28, 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 - LGW

SEALGW

Seattle/Tacoma Intl

Mon 5/19

7:00 pm-2:35 pm

1 stop11h 35m

London Gatwick

Tue 6/3

8:55 pm-8:28 pm

2 stops31h 33m

$593

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Tue 5/6

7:00 pm-2:40 pm

1 stop11h 40m

London Gatwick

Fri 5/16

3:40 pm-8:40 pm

1 stop13h 00m

$594

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Thu 9/11

11:30 pm-11:55 am

1 stop28h 25m

London Heathrow

Wed 9/17

9:25 pm-8:40 pm

1 stop31h 15m

$597

SeattleManchester

SEA - MAN

SEAMAN

Seattle/Tacoma Intl

Tue 4/29

7:00 pm-11:40 am

1 stop32h 40m

Manchester

Tue 5/6

9:05 am-8:28 pm

2 stops19h 23m

$602

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 9/21

4:20 pm-9:40 pm

1 stop21h 20m

London Heathrow

Wed 10/1

6:40 am-2:00 pm

1 stop15h 20m

$606

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 5/18

7:00 pm-8:20 pm

1 stop17h 20m

London Heathrow

Wed 5/28

9:25 pm-12:58 pm

2 stops23h 33m

$610

SeattleGlasgow

SEA - GLA

SEAGLA

Seattle/Tacoma Intl

Tue 5/6

3:45 pm-1:25 pm

1 stop13h 40m

Glasgow Intl

Tue 5/20

2:20 pm-5:50 pm

1 stop11h 30m

$611

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 4/13

1:30 pm-6:50 am

Nonstop9h 20m

London Heathrow

Wed 4/30

9:50 am-11:35 am

Nonstop9h 45m

$632

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 4/27

6:00 am-6:35 am

1 stop16h 35m

London Heathrow

Tue 5/13

6:00 am-6:33 pm

2 stops20h 33m

$641

SeattleManchester

SEA - MAN

SEAMAN

Seattle/Tacoma Intl

Sun 6/8

4:00 pm-9:30 am

1 stop33h 30m

Manchester

Sun 8/31

9:20 am-1:50 pm

2 stops36h 30m

$641

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/26

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 $661). Flying from Seattle to United Kingdom in June is currently the most expensive (average of $1,115). 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 March 28, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seattle to United Kingdom as you normally would.

Rainfall in United Kingdom by month

Plan your trip to United Kingdom by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in United Kingdom ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit United Kingdom when rainfall is around 1.6 in.

Temperature in United Kingdom by month

Plan your trip to United Kingdom by taking into account the average temperature totals by month.

If weather is an important factor for your trip to United Kingdom, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

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 March 28, 2025.
See what other customers who have flown with Delta, KLM and Finnair from Seattle to United Kingdom have to say. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,896 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,896 reviews
Delta
8.0
Very good
7,896 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.8
Good
1,321 reviews
Delta
8.0
Very good
7,896 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Finnair
7.6
Good
1,267 reviews
Delta
8.0
Very good
7,896 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
SWISS
7.5
Good
1,570 reviews
Delta
8.0
Very good
7,896 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Air France
7.4
Good
1,424 reviews
Delta
8.0
Very good
7,896 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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.

  • 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 ($287), WestJet ($389), and Scandinavian Airlines ($393).

  • 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 Aeromexico (80%), Singapore Airlines (80%) or American Airlines (73%) 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 $2,699 for a flight from Seattle to United Kingdom. The cheapest flight overall is $412 while the most popular route, (Seattle/Tacoma Intl - London Heathrow) is currently priced at $542.

  • 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 $661). Flying from Seattle to United Kingdom in June is currently the most expensive (average of $1,115). 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

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Alternative routes for Seattle to United Kingdom

See prices for flight routes from nearby airports that may be better suited for you.
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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 March 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest$378Average$923FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$498Average$1,067FlexibilityNo cancel feeOn-time69%
IcelandairCheapest$500Average$746FlexibilityNo cancel feeOn-time76%
American AirlinesCheapest$568Average$875FlexibilityNo cancel feeOn-time71%
Aer LingusCheapest$579Average$950FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$582Average$735FlexibilityNo cancel feeOn-time77%
DeltaCheapest$584Average$1,042FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$585Average$909FlexibilityNo cancel feeOn-time70%
Virgin AtlanticCheapest$595Average$976FlexibilityNo cancel feeOn-time72%
FinnairCheapest$597Average$809FlexibilityNo cancel feeOn-time76%
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