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$283+ Cheap flights from Washington to London, ON (YXU)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/22. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YXU
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheap flight deals from Washington to London

Cheapest flights from Washington to London
Explore the most affordable flight options available from Washington to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2025.

This Air Canada deal was found by Cheapflights users on 12/17. 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.
Wed 12/245:50 amSEA - YXU
2 stops12h 31mAir Canada
Wed 12/315:40 pmYXU - SEA
1 stop7h 36mAir Canada
Deal found 12/17$953
This United Airlines deal was found by Cheapflights users on 12/17. 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.
Wed 12/241:35 pmSEA - YXU
3 stops24h 30mUnited Airlines
Wed 12/315:10 amYXU - SEA
2 stops20h 58mUnited Airlines
Deal found 12/17$1,366

Find flight deals from Washington to London

Keep the following information in mind while searching for Washington to London flight deals. Data was last updated December 18, 2025.

Most accurate provider

oojo
3 stars

Most trusted provider

oojo
3 stars

Round-trip from

$283
(Air Canada)
Provider with most accurate pricing for Seattle/Tacoma Intl-London flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-London flights.
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From Washington to London
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington 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 December 18, 2025.
Use the filters below to find and compare flights from Washington to London that are best for you.

Fly from

Washington

Fly to

London

Route

Depart

Return

Price

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Fri 1/30

8:00 pm-8:46 am

2 stops9h 46m

London

Fri 2/6

5:40 pm-10:16 pm

1 stop7h 36m

$283

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Thu 1/22

8:00 pm-8:46 am

2 stops9h 46m

London

Mon 1/26

5:40 pm-10:16 pm

1 stop7h 36m

$283

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Fri 1/30

12:35 pm-5:05 pm

3 stops25h 30m

London

Fri 2/6

5:10 am-10:43 pm

2 stops20h 33m

$394

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/15

Best time to book a flight from Washington to London

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

What is the cheapest month to book a flight from State of Washington to London, Ontario?

Currently, March is the cheapest month in which you can book a flight from State of Washington to London, Ontario (average of $121). Flying from State of Washington to London, Ontario in May is currently the most expensive (average of $272). 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.

Related info for your journey

Find useful and relevant information for your journey from Washington 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 into for flights to London from Washington?

    Located just 5.3 mi from the city center, London (YXU) is the airport most travelers will use when flying to London from Washington.

  • How long is the flight from State of Washington to London, Ontario?

    Air Canada can get you from State of Washington to London, Ontario in just under 9h 46m. Your travel time can differ by up to . The distance from State of Washington to London, Ontario is about 2000 mi.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Washington 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 State of Washington to London, Ontario?

    Currently, March is the cheapest month in which you can book a flight from State of Washington to London, Ontario (average of $121). Flying from State of Washington to London, Ontario in May is currently the most expensive (average of $272). 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 airline flying from Washington to London

Discover the top airline that operate flights from Washington 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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$460Average$857FlexibilityNo cancel feeOn-time67%

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