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$272+ 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 9/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LHR
Mai 6 — Mai 131
Di 5/6
Di 5/13
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 Mai 1, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$543
(oojo)

One-way from

$272
(oojo)

Popular in

June

Cheapest in

October

Average price

$796

Good round-trip deal

$738 or less

Good one-way deal

$492 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. 18% potential increase in price ($178 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($27 potential savings vs. average RT price).
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Average for round-trip flights in May 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 Mai 1, 2025.

This oojo deal was found by Cheapflights users on 4/30. 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.
Di 10/73:45 pmSEA - MAN
1 stop11h 55mIcelandair
Mi 11/511:55 amMAN - SEA
1 stop13h 05mIcelandair
Deal found 4/30$543
This American Airlines deal was found by Cheapflights users on 4/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mo 8/111:30 pmSEA - INV
1 stop12h 45mAmerican Airlines
Mi 8/203:40 pmINV - SEA
1 stop27h 55mAmerican Airlines
Deal found 4/30$563
This Cheapflightsfares deal was found by Cheapflights users on 4/30. 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.
Di 8/261:30 pmSEA - MAN
1 stop12h 15mBritish Airways
Di 9/97:00 amMAN - SEA
1 stop19h 20mBritish Airways
Deal found 4/30$570
This oojo deal was found by Cheapflights users on 4/30. 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.
Sa 8/167:00 pmSEA - GLA
1 stop10h 25mIcelandair
Di 8/262:20 pmGLA - SEA
1 stop11h 30mIcelandair
Deal found 4/30$573
This oojo deal was found by Cheapflights users on 4/30. 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.
Mo 8/1110:40 amSEA - INV
2 stops20h 20mBritish Airways
Mi 8/2010:30 amINV - SEA
2 stops21h 20mBritish Airways
Deal found 4/30$578
This American Airlines deal was found by Cheapflights users on 4/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 10/71:29 pmSEA - MAN
2 stops17h 46mAmerican Airlines
Mi 11/58:55 amMAN - SEA
1 stop16h 00mAmerican Airlines
Deal found 4/30$585
This FlightHub deal was found by Cheapflights users on 4/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
So 8/244:00 pmSEA - EDI
1 stop18h 10mScandinavian Airlines
Mo 9/17:45 pmEDI - SEA
2 stops50h 05mScandinavian Airlines
Deal found 4/29$619
This oojo deal was found by Cheapflights users on 4/28. 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.
Sa 7/2611:30 pmSEA - LHR
1 stop28h 25mIcelandair
Do 8/289:25 pmLHR - SEA
1 stop22h 00mIcelandair
Deal found 4/28$626
This Delta deal was found by Cheapflights users on 4/30. 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.
Sa 8/2311:35 pmSEA - LHR
1 stop23h 10mDelta
Fr 9/56:00 pmLHR - SEA
Nonstop10h 25mDelta
Deal found 4/30$628
This Cheapflightsfares deal was found by Cheapflights users on 4/29. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mi 5/214:00 pmSEA - LHR
1 stop21h 40mScandinavian Airlines
Mo 5/266:40 amLHR - SEA
1 stop15h 10mScandinavian Airlines
Deal found 4/29$629
This oojo deal was found by Cheapflights users on 4/30. 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.
Fr 5/23:45 pmSEA - LGW
1 stop12h 00mIcelandair
Di 5/203:40 pmLGW - SEA
1 stop13h 00mIcelandair
Deal found 4/30$630
This Air Canada deal was found by Cheapflights users on 4/30. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mi 11/1210:00 amSEA - LHR
1 stop16h 10mMultiple Airlines
Mi 11/196:30 amLHR - SEA
2 stops15h 56mMultiple Airlines
Deal found 4/30$638

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 Mai 1, 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

SeattleManchester

SEA - MAN

SEAMAN

Seattle/Tacoma Intl

Di 10/7

3:45 pm-11:40 am

1 stop11h 55m

Manchester

Mi 11/5

11:55 am-5:00 pm

1 stop13h 05m

$543

SeattleManchester

SEA - MAN

SEAMAN

Seattle/Tacoma Intl

Di 8/26

1:30 pm-9:45 am

1 stop12h 15m

Manchester

Di 9/9

7:00 am-6:20 pm

1 stop19h 20m

$570

SeattleGlasgow

SEA - GLA

SEAGLA

Seattle/Tacoma Intl

Sa 8/16

7:00 pm-1:25 pm

1 stop10h 25m

Glasgow Intl

Di 8/26

2:20 pm-5:50 pm

1 stop11h 30m

$573

SeattleManchester

SEA - MAN

SEAMAN

Seattle/Tacoma Intl

Di 10/7

1:29 pm-3:15 pm

2 stops17h 46m

Manchester

Mi 11/5

8:55 am-4:55 pm

1 stop16h 00m

$585

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sa 7/26

11:30 pm-11:55 am

1 stop28h 25m

London Heathrow

Do 8/28

9:25 pm-11:25 am

1 stop22h 00m

$626

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sa 8/23

11:35 pm-6:45 am

1 stop23h 10m

London Heathrow

Fr 9/5

6:00 pm-8:25 pm

Nonstop10h 25m

$628

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mi 5/21

4:00 pm-9:40 pm

1 stop21h 40m

London Heathrow

Mo 5/26

6:40 am-1:50 pm

1 stop15h 10m

$629

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

So 8/17

1:30 pm-6:50 am

Nonstop9h 20m

London Heathrow

Do 8/28

12:30 pm-8:02 pm

1 stop15h 32m

$634

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mi 8/27

7:20 am-10:00 am

1 stop18h 40m

London Heathrow

Do 9/4

6:30 am-6:36 pm

2 stops20h 06m

$638

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sa 7/26

3:15 pm-10:00 am

2 stops34h 45m

London Gatwick

Do 8/28

12:00 pm-10:53 pm

1 stop18h 53m

$641

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

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 $1,103). 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 Mai 1, 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.

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 Mai 1, 2025.

The most flights from SEA to GB0 are scheduled on a Monday (22 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (16 on average).

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 Mai 1, 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
7,934 reviews

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

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
7,934 reviews
Delta
8.0
Very good
7,934 reviews

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

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
1,334 reviews
Delta
8.0
Very good
7,934 reviews

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

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
1,275 reviews
Delta
8.0
Very good
7,934 reviews

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

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
1,588 reviews
Delta
8.0
Very good
7,934 reviews

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

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
1,446 reviews
Delta
8.0
Very good
7,934 reviews

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

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 ($272), WestJet ($336), and JetBlue ($364).

  • 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 Scandinavian Airlines (90%), KLM (85%) or Aeromexico (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 $2,417 for a flight from Seattle to United Kingdom. The cheapest flight overall is $409 while the most popular route, (Seattle/Tacoma Intl - London Heathrow) is currently priced at $485.

  • 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 $1,103). 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

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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 Mai 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest$378Average$909FlexibilityNo cancel feeOn-time76%
IcelandairCheapest$500Average$701FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$550Average$1,007FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$568Average$851FlexibilityNo cancel feeOn-time71%
IberiaCheapest$579Average$732FlexibilityNo cancel feeOn-time77%
Aer LingusCheapest$583Average$966FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$584Average$789FlexibilityNo cancel feeOn-time77%
DeltaCheapest$584Average$1,054FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$585Average$921FlexibilityNo cancel feeOn-time70%
Virgin AtlanticCheapest$595Average$971FlexibilityNo cancel feeOn-time72%

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