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$265+ Cheap flights from Seattle (SEA) to London (LON)

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 10/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LON
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to London are usually found in October or August, booked 51 days in advance, depart on a Tuesday or Wednesday and return on a Wednesday

Cheap flight deals from Seattle to London

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to London (LON). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 17, 2025.

Round-trip from

$508
(Cheapflightsfares)

One-way from

$265
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$697

Good round-trip deal

$654 or less

Good one-way deal

$417 or less
From Seattle/Tacoma Intl to London (LON)
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One-way flight from Seattle/Tacoma Intl to London (LON)
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Highest demand for flights based on searches. 15% potential increase in price ($138 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($23 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Seattle/Tacoma Intl to London (LON).
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Price to beat on a one-way flight from Seattle/Tacoma Intl to London (LON).
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Find flight deals from Seattle to London

Cheapest flights from Seattle to London
Explore the most affordable flight options available from Seattle to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 9/16. 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 10/17:00 pmSEA - LGW
1 stop11h 40mIcelandair
Wed 10/153:40 pmLGW - SEA
1 stop13h 00mIcelandair
Deal found 9/16$508
This Mytrip deal was found by Cheapflights users on 9/15. 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.
Mon 9/225:35 pmSEA - LHR
Nonstop9h 45mVirgin Atlantic
Tue 10/75:35 pmLHR - SEA
1 stop25h 40mVirgin Atlantic
Deal found 9/15$508
This Delta deal was found by Cheapflights users on 9/16. 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 11/124:48 pmSEA - LHR
Nonstop9h 42mDelta
Wed 11/196:20 amLHR - SEA
1 stop15h 00mDelta
Deal found 9/16$509
This Air France deal was found by Cheapflights users on 9/15. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/124:48 pmSEA - LHR
Nonstop9h 42mAir France
Thu 11/206:20 amLHR - SEA
1 stop13h 05mAir France
Deal found 9/15$510
This Gurufare deal was found by Cheapflights users on 9/15. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/62:35 pmSEA - LGW
1 stop12h 20mIcelandair
Wed 11/1911:55 amLGW - SEA
1 stop13h 05mIcelandair
Deal found 9/15$511
This Delta deal was found by Cheapflights users on 9/15. 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.
Tue 10/148:25 pmSEA - LHR
Nonstop9h 50mDelta
Thu 10/236:30 amLHR - SEA
1 stop17h 35mDelta
Deal found 9/15$511
This Gurufare deal was found by Cheapflights users on 9/16. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/182:35 pmSEA - LGW
1 stop12h 20mIcelandair
Thu 11/2711:55 amLGW - SEA
1 stop13h 05mIcelandair
Deal found 9/16$512
This Cheapflightsfares deal was found by Cheapflights users on 9/15. 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 10/11:30 pmSEA - LHR
Nonstop9h 20mBritish Airways
Tue 10/149:25 amLHR - SEA
Nonstop9h 45mBritish Airways
Deal found 9/15$512
This Cheapflightsfares deal was found by Cheapflights users on 9/16. 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 10/63:45 pmSEA - LHR
1 stop12h 10mIcelandair
Fri 10/101:05 pmLHR - SEA
1 stop15h 35mIcelandair
Deal found 9/16$513
This Mytrip deal was found by Cheapflights users on 9/15. 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.
Mon 12/12:35 pmSEA - LGW
2 stops18h 45mMultiple Airlines
Sun 12/148:25 amLGW - SEA
2 stops16h 35mMultiple Airlines
Deal found 9/15$514
This Delta deal was found by Cheapflights users on 9/15. 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 9/222:25 pmSEA - LHR
1 stop18h 50mDelta
Tue 10/76:15 amLHR - SEA
1 stop19h 25mDelta
Deal found 9/15$514
This Gurufare deal was found by Cheapflights users on 9/15. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/62:35 pmSEA - LHR
1 stop12h 15mIcelandair
Tue 11/1812:15 pmLHR - SEA
1 stop12h 45mIcelandair
Deal found 9/15$515

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to London 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 September 17, 2025.
Use the filters below to find and compare flights from Seattle to London that are best for you.

Fly from

Seattle

Fly to

London

Route

Depart

Return

Price

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 11/12

4:48 pm-10:30 am

Nonstop9h 42m

London Heathrow

Wed 11/19

6:20 am-1:20 pm

1 stop15h 00m

$509

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 10/27

5:45 pm-10:30 am

Nonstop9h 45m

London Heathrow

Tue 11/11

6:20 am-11:25 am

1 stop13h 05m

$510

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 10/6

5:35 pm-11:20 am

Nonstop9h 45m

London Heathrow

Wed 10/22

6:15 am-11:15 am

1 stop13h 00m

$510

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 11/2

9:25 am-7:05 am

1 stop13h 40m

London Heathrow

Tue 11/11

6:20 am-11:25 am

1 stop13h 05m

$515

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 3/9

7:50 pm-12:20 pm

Nonstop9h 30m

London Heathrow

Thu 3/26

2:55 pm-5:55 pm

Nonstop10h 00m

$517

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 11/18

5:50 am-11:50 am

1 stop22h 00m

London Heathrow

Thu 11/27

6:50 am-8:54 pm

2 stops22h 04m

$517

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 3/4

6:50 pm-12:20 pm

Nonstop9h 30m

London Heathrow

Thu 3/26

2:55 pm-5:55 pm

Nonstop10h 00m

$517

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Wed 11/5

2:35 pm-10:55 am

1 stop12h 20m

London Gatwick

Fri 11/21

11:55 am-5:00 pm

1 stop13h 05m

$518

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Fri 3/6

2:35 pm-10:55 am

1 stop12h 20m

London Gatwick

Mon 3/30

3:40 pm-9:10 pm

1 stop13h 30m

$518

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Fri 3/6

2:35 pm-10:55 am

1 stop12h 20m

London Gatwick

Tue 3/31

3:40 pm-9:10 pm

1 stop13h 30m

$518

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 60 results
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The best insider tips for Seattle to London flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Seattle to London trip
Airports
SEA

Plan to arrive at SEA at least two hours before your flight due to potentially long security lines.

Read more about SEAby Brandon Schultz
LHR

Take the Heathrow Express for the fastest route into central London from LHR, arriving at Paddington Station.

Read more about LHRby Ramsey Qubein
Our travel experts
Ramsey Qubein

Ramsey Qubein

Expert on LHR

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more
Brandon Schultz

Brandon Schultz

Expert on SEA

Brandon Schultz

Brandon Schultz

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Read more

Best time to book a flight from Seattle to London

Have a flexible travel schedule? Discover the best time to fly to London 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 London

How far ahead should I book a flight from Seattle to London?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to London. Price data was last updated on September 12, 2025.

Booking 51 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to London. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, November is the cheapest month in which you can book a flight from Seattle to London (average of $661). Flying from Seattle to London in June is currently the most expensive (average of $1,097). 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 LON?

Find hourly flight availability from Seattle to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 17, 2025.

One of the essential ways to save on airfare from Seattle to London is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 14% on airfare.

What is the cheapest day to fly from Seattle to London?

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

Travelers seeking maximum savings on their Seattle to London flight should consider departing on Tuesday at noon when fares are most often at their lowest. Friday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Seattle to London

Explore weekly flight availability from Seattle to London. 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 September 17, 2025.

The most flights from SEA to LON are scheduled on a Monday (21 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (15 on average).

How much does it cost to fly round-trip from Seattle to London?

What’s the top layover airport for flights from Seattle to London?

Share of 1-stop round-trip flights from Seattle to London chosen by Cheapflights users in the past 12 months, using the same layover each way.

Reykjavik (KEF) – chosen by Cheapflights users on 83% of 1-stop itineraries from Seattle to London on Cheapflights.

What’s the cheapest layover airport for flights from Seattle to London?

Average round-trip fare for 1-stop flights from Seattle to London, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Reykjavik (KEF) is the most affordable 1-stop option, with an average round-trip price of $530.

What’s the fastest layover option from Seattle to London?

Shortest average travel time for 1-stop one-way flights from Seattle to London, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Dublin (DUB) have the shortest average one-way travel time for 1-stop routes: 11h 35m.

Which airport typically offers the quickest layover for flights from Seattle to London?

Average layover duration for 1-stop one-way flights from Seattle to London, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Reykjavik (KEF) offer the fastest connection on this route, with an average layover time of 1h 29m.

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. 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 London. Reviews last updated September 17, 2025.
Peruse reviews from past customers who have flown with Delta, Virgin Atlantic, and Icelandair from Seattle to London to help guide your decision. 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
7,961 reviews

Comfort

7.9

Crew

8.5

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,961 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Crew

8.5

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Virgin Atlantic
7.4
Good
664 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Crew

8.5

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Icelandair
7.0
Good
545 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Crew

8.5

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Iberia
7.0
Good
2,925 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Crew

8.5

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
British Airways
6.7
Okay
7,367 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Crew

8.5

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

Find useful and relevant information for your journey from Seattle to London. 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 London?

    If you book a flight to London from Seattle, you will be flying from Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 11.4 mi from the center of Seattle. There are 20 flights from Seattle/Tacoma Intl to London per day from 15 different airlines.

  • How long is the flight from Seattle to London?

    A quick flight from Seattle to London can take about 9h 30m. Delta provides one of the quickest options available for as low as $517. The distance between Seattle and London is about 4783 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Seattle to London round-trip?

    Cheapflights users have booked flights from Seattle to London round-trip from $378. Other airlines that can offer you cheap pricing are Icelandair, from $484, and Aer Lingus, from $523. Users have found that Lufthansa is 50% cheaper than the other options available to this destination.

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

    One-way options have recently been found by users for as low as $311 on Scandinavian Airlines. Other airlines that offer cheap prices include JetBlue from $349 and SWISS from $394 one-way.

  • What are the most popular routes from Seattle to London?

    When deciding which route to take from Seattle to London consider Seattle/Tacoma Intl - London Heathrow, Seattle/Tacoma Intl - London Gatwick or Seattle/Tacoma Intl - London City as they are the most popular.

  • What are the most reliable airlines from Seattle to London?

    Consider Aeromexico (90%), KLM (83%) or Air France (83%) when booking your flight. These represent the most reliable airlines when flying from Seattle to London.

  • What are the cheapest flights from Seattle to London?

    Looking at all options, your cheapest flight can be booked for $326. While the most popular route (Seattle/Tacoma Intl - London Heathrow) can be booked for $471 on average, our data indicates $2,215 when flying from Seattle to London.

  • Where are the most common layover locations when flying from Seattle to London?

    The most popular layover on flights from Seattle to London is Reykjavik.

  • What are some popular things to do or see while on a layover in Reykjavik?

    Reykjavik travelers tend to visit Harpa, Hallgrímskirkja, and Laugardalslaug Geothermal Pool more than anywhere else. Harpa, Hallgrímskirkja, and Laugardalslaug Geothermal Pool are located about 23.3 mi, 23.2 mi, and 24.6 mi, respectively from Reykjavik Keflavik Intl. Travelers in need of a car in Reykjavik can rent one for about $56 per day.

  • Where are the least popular layover locations for Seattle to London flights?

    Flights departing from Seattle and landing in London layover in Dublin least frequently.

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

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

  • How can I find direct flights from Seattle to London?

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

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

    Yes. Cheapflights offers flight deals from Seattle to London 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 London?

    Currently, November is the cheapest month in which you can book a flight from Seattle to London (average of $661). Flying from Seattle to London in June is currently the most expensive (average of $1,097). 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

Traveling to a place near London?

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Alternative routes for Seattle to London

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 London

Discover the top 10 airlines that operate flights from Seattle to London. 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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest$378Average$865FlexibilityNo cancel feeOn-time76%
IcelandairCheapest$484Average$646FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$523Average$733FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$532Average$871FlexibilityNo cancel feeOn-time77%
Air FranceCheapest$532Average$804FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$547Average$825FlexibilityNo cancel feeOn-time69%
FinnairCheapest$556Average$706FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$556Average$804FlexibilityNo cancel feeOn-time70%
DeltaCheapest$563Average$846FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$569Average$865FlexibilityNo cancel feeOn-time71%

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