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Cheap flights from Washington to London, ON from C$ 395

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 2/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YXU
29 Nov — 6 Dec1
1 adult
1 adult, Economy, 0 bags

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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 30 October 2025.

Fri 12/128:00 p.m.SEA - YXU
2 stops9h 46mAir Canada
Fri 19/129:25 a.m.YXU - SEA
1 stop15h 51mAir Canada
Deal found 28/10C$ 870
Tue 25/115:05 a.m.SEA - YXU
2 stops9h 00mUnited Airlines
Tue 2/125:40 p.m.YXU - SEA
1 stop7h 36mUnited Airlines
Deal found 28/10C$ 927
Tue 25/113:10 p.m.SEA - YXU
1 stop25h 02mWestJet
Tue 2/128:10 p.m.YXU - SEA
1 stop21h 25mWestJet
Deal found 28/10C$ 1,028
Fri 12/1211:59 p.m.SEA - YXU
2 stops14h 06mUnited Airlines
Fri 19/125:10 a.m.YXU - SEA
2 stops20h 27mUnited Airlines
Deal found 28/10C$ 1,173

Cheap flight deals from Washington to London

Keep the following information in mind while searching for Washington to London flight deals. Data was last updated 30 October 2025.

Round-trip from

C$ 395
Air Canada
  • Air Canada
  • 2/3-4/3
  • 3 total stops
  • 17h 22m total
  • 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 629,999 searches. Data last updated 30 October 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

Mon 2/3

8:00 p.m.-8:46 a.m.

2 stops9h 46m

London

Wed 4/3

5:40 p.m.-10:16 p.m.

1 stop7h 36m

C$ 395

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Mon 2/3

7:00 a.m.-9:21 p.m.

2 stops11h 21m

London

Wed 4/3

5:15 a.m.-6:03 p.m.

3 stops15h 48m

C$ 550

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Fri 12/12

8:00 p.m.-8:46 a.m.

2 stops9h 46m

London

Fri 19/12

9:25 a.m.-10:16 p.m.

1 stop15h 51m

C$ 870

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 25/11

5:05 a.m.-5:05 p.m.

2 stops9h 00m

London

Tue 2/12

5:40 p.m.-10:16 p.m.

1 stop7h 36m

C$ 927

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/10

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 C$ 169). Flying from State of Washington to London, Ontario in May is currently the most expensive (average of C$ 378). 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?

    For a flight from Washington to London, you will be flying into London. London (YXU) is just 8.6 km from the centre of the city.

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

    There are many flights that can get you from State of Washington to London, Ontario in 9h 46m. Fly via Air Canada to get the fastest option. The distance between State of Washington and London, Ontario is about 3219 km.

  • 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 C$ 169). Flying from State of Washington to London, Ontario in May is currently the most expensive (average of C$ 378). 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

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Port Stanley
Grand Bend

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