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$230+ Cheap flights from London, ON (YXU) to Seattle (SEA)

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 12/12. Fares are subject to change and may not be available on all flights or dates of travel.
YXU — SEA
nov. 28 — dic. 51
vie. 11/28
vie. 12/5
1 adult, Economy
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Find flight deals from London to Seattle

Cheapest flights from London to Seattle
Explore the most affordable flight options available from London to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on octubre 29, 2025.

This WestJet 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 WestJet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/118:10 pmYXU - SEA
1 stop21h 10mWestJet
jue. 12/183:10 pmSEA - YXU
1 stop12h 24mWestJet
Deal found 10/27$590
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/105:40 pmYXU - SEA
1 stop7h 36mUnited Airlines
vie. 11/147:13 pmSEA - YXU
2 stops18h 52mUnited Airlines
Deal found 10/28$729
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/119:25 amYXU - SEA
2 stops16h 03mUnited Airlines
jue. 12/1812:35 pmSEA - YXU
3 stops25h 30mUnited Airlines
Deal found 10/27$778
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 12/135:10 amYXU - SEA
2 stops22h 40mUnited Airlines
sáb. 12/2010:52 amSEA - YXU
2 stops27h 13mUnited Airlines
Deal found 10/29$806
This Air Canada 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/105:40 pmYXU - SEA
1 stop7h 36mAir Canada
vie. 11/148:10 amSEA - YXU
1 stop10h 11mAir Canada
Deal found 10/28$886

Cheap flight deals from London to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from London (YXU) to Seattle (SEA). 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 octubre 29, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$590
(WestJet)

One-way from

$230
(Trip.com)
Provider with most accurate pricing for London-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for London-Seattle/Tacoma Intl flights.
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From London to Seattle/Tacoma Intl
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One-way flight from London to Seattle/Tacoma Intl
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Cheapflights Fare Finder

 
Customize your flight search to find flights from London to Seattle 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 octubre 29, 2025.
Use the filters below to find and compare flights from London to Seattle that are best for you.

Fly from

London

Fly to

Seattle

Route

Depart

Return

Price

LondonSeattle

YXU - SEA

YXUSEA

London

jue. 12/11

8:10 pm-2:20 pm

1 stop21h 10m

Seattle/Tacoma Intl

jue. 12/18

3:10 pm-6:34 am

1 stop12h 24m

$590

LondonSeattle

YXU - SEA

YXUSEA

London

lun. 11/10

5:40 pm-10:16 pm

1 stop7h 36m

Seattle/Tacoma Intl

vie. 11/14

7:13 pm-5:05 pm

2 stops18h 52m

$729

LondonSeattle

YXU - SEA

YXUSEA

London

jue. 12/11

9:25 am-10:28 pm

2 stops16h 03m

Seattle/Tacoma Intl

jue. 12/18

12:35 pm-5:05 pm

3 stops25h 30m

$778

LondonSeattle

YXU - SEA

YXUSEA

London

sáb. 12/13

5:40 pm-10:16 pm

1 stop7h 36m

Seattle/Tacoma Intl

sáb. 12/20

10:52 am-5:05 pm

2 stops27h 13m

$806

LondonSeattle

YXU - SEA

YXUSEA

London

lun. 11/10

5:40 pm-10:16 pm

1 stop7h 36m

Seattle/Tacoma Intl

vie. 11/14

8:10 am-9:21 pm

1 stop10h 11m

$886

LondonSeattle

YXU - SEA

YXUSEA

London

vie. 12/12

7:30 am-6:55 pm

2 stops14h 25m

$230

LondonSeattle

YXU - SEA

YXUSEA

London

vie. 12/12

5:40 pm-10:16 pm

1 stop7h 36m

$246

LondonSeattle

YXU - SEA

YXUSEA

London

vie. 12/12

7:30 am-10:22 am

3 stops29h 52m

$273

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Compare providers for flights from London to Seattle

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from London to Seattle in October.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on London, Ontario-Seattle flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on London, Ontario-Seattle flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from London, Ontario-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on London, Ontario-Seattle flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London, Ontario-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from London to Seattle

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

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

Currently, May is the cheapest month in which you can book a flight from London, Ontario to Seattle (average of $92). Flying from London, Ontario to Seattle in June is currently the most expensive (average of $249). 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 YXU to SEA?

Find hourly flight availability from London to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated octubre 29, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 31% on flights from London, Ontario to Seattle by exploring options for tickets in the afternoon.

Related info for your journey

Find useful and relevant information for your journey from London to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from London, Ontario to Seattle?

    Departing from London, Ontario to Seattle will take you 7h 36m. There are 2000 mi between London, Ontario and Seattle. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

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

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

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

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

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

    Currently, May is the cheapest month in which you can book a flight from London, Ontario to Seattle (average of $92). Flying from London, Ontario to Seattle in June is currently the most expensive (average of $249). 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 Seattle?

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Kirkland
Lacey
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Federal Way
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