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Cheap flights from Washington to London, ON from C$ 559

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 31/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YXU
16 Oct — 23 Oct1
1 adult
1 adult, Economy

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 16 September 2025.

Round-trip from

C$ 559
Air Canada
  • Air Canada
  • 31/10-7/11
  • 3 total stops
  • 25h 41m total
  • Washington to London
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Find 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 16 September 2025.

Fri 31/108:15 a.m.SEA - YXU
1 stop10h 06mAir Canada
Fri 7/115:40 p.m.YXU - SEA
1 stop7h 36mAir Canada
Deal found 16/9C$ 559
Mon 22/128:00 p.m.SEA - YXU
2 stops9h 46mAir Canada
Mon 29/125:40 p.m.YXU - SEA
1 stop7h 36mAir Canada
Deal found 16/9C$ 836
Fri 31/1010:55 p.m.SEA - YXU
3 stops42h 17mWestJet
Fri 7/118:10 p.m.YXU - SEA
2 stops17h 13mWestJet
Deal found 16/9C$ 944
Fri 31/1010:55 p.m.SEA - YXU
3 stops42h 17mMultiple Airlines
Fri 7/118:10 p.m.YXU - SEA
3 stops41h 13mMultiple Airlines
Deal found 16/9C$ 960
Mon 22/125:02 a.m.SEA - YXU
2 stops13h 19mUnited Airlines
Mon 29/125:45 a.m.YXU - SEA
3 stops18h 32mUnited Airlines
Deal found 16/9C$ 2,054

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 16 September 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 31/10

8:00 p.m.-5:05 p.m.

2 stops18h 05m

London

Fri 7/11

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

1 stop7h 36m

C$ 559

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Mon 22/12

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

2 stops9h 46m

London

Mon 29/12

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

1 stop7h 36m

C$ 836

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Fri 31/10

10:55 p.m.-8:12 p.m.

3 stops42h 17m

London

Fri 7/11

8:10 p.m.-10:23 a.m.

2 stops17h 13m

C$ 944

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Fri 31/10

10:55 p.m.-8:12 p.m.

3 stops42h 17m

London

Fri 7/11

8:10 p.m.-10:23 a.m.

3 stops41h 13m

C$ 960

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Mon 22/12

5:02 a.m.-9:21 p.m.

2 stops13h 19m

London

Mon 29/12

5:45 a.m.-9:17 p.m.

3 stops18h 32m

C$ 2,054

Flights are sorted by cheapest round-trip flights first.

Deals found on 16/9

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, October is the cheapest month in which you can book a flight from State of Washington to London, Ontario (average of C$ 243). Flying from State of Washington to London, Ontario in December is currently the most expensive (average of C$ 478). 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 18h 05m. 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, October is the cheapest month in which you can book a flight from State of Washington to London, Ontario (average of C$ 243). Flying from State of Washington to London, Ontario in December is currently the most expensive (average of C$ 478). 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
Grand Bend
Port Stanley

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