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Cheap flights from Washington to London, ON from C$ 500

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 19/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YXU
5 May — 12 May1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Washington to London

Enter your travel dates to find the best prices.

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 5 April 2026.

Tue 19/57:35 p.m.
SEA
-
YXU
1 stop6h 45m
WestJet
Tue 26/55:55 p.m.
YXU
-
SEA
1 stop18h 45m
WestJet
Deal found 4/4C$ 500
Wed 29/47:35 p.m.
SEA
-
YXU
1 stop6h 45m
WestJet
Sun 3/56:10 a.m.
YXU
-
SEA
1 stop15h 35m
WestJet
Deal found 2/4C$ 604
Mon 1/65:50 a.m.
SEA
-
YXU
2 stops12h 48m
Air Canada
Fri 5/63:30 p.m.
YXU
-
SEA
1 stop8h 38m
Air Canada
Deal found 31/3C$ 715
Sun 17/510:30 a.m.
SEA
-
YXU
1 stop15h 50m
WestJet
Sun 24/55:55 p.m.
YXU
-
SEA
1 stop18h 45m
WestJet
Deal found 1/4C$ 719
Mon 1/67:35 p.m.
SEA
-
YXU
1 stop6h 45m
WestJet
Fri 5/65:55 p.m.
YXU
-
SEA
1 stop18h 45m
WestJet
Deal found 31/3C$ 736
Sun 17/58:00 a.m.
SEA
-
YXU
1 stop10h 38m
Air Canada
Sun 24/55:10 a.m.
YXU
-
SEA
2 stops12h 10m
Air Canada
Deal found 1/4C$ 818
Mon 18/58:00 a.m.
SEA
-
YXU
1 stop10h 38m
United Airlines
Mon 25/56:10 p.m.
YXU
-
SEA
2 stops18h 30m
United Airlines
Deal found 3/4C$ 898
Wed 29/411:35 p.m.
SEA
-
YXU
2 stops14h 29m
United Airlines
Sun 3/56:10 p.m.
YXU
-
SEA
2 stops31h 42m
United Airlines
Deal found 4/4C$ 980

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 5 April 2026.

Round-trip from

C$ 500
WestJet
  • WestJet
  • 19/5-26/5
  • 2 total stops
  • 25h 30m total
  • Washington to London
Search Deals

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 5 April 2026.
Use the filters below to find and compare flights from Washington to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 19/5

7:35 p.m.-5:20 a.m.

1 stop6h 45m

London

Tue 26/5

5:55 p.m.-9:40 a.m.

1 stop18h 45m

C$ 500
Quickest round-trip

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Mon 1/6

5:50 a.m.-9:38 p.m.

2 stops12h 48m

London

Fri 5/6

3:30 p.m.-9:08 p.m.

1 stop8h 38m

C$ 715

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sun 17/5

10:30 a.m.-5:20 a.m.

1 stop15h 50m

London

Sun 24/5

5:55 p.m.-9:40 a.m.

1 stop18h 45m

C$ 719

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Mon 1/6

7:35 p.m.-5:20 a.m.

1 stop6h 45m

London

Fri 5/6

5:55 p.m.-9:40 a.m.

1 stop18h 45m

C$ 736

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sun 17/5

8:00 a.m.-9:38 p.m.

1 stop10h 38m

London

Sun 24/5

5:10 a.m.-2:20 p.m.

2 stops12h 10m

C$ 818

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Mon 18/5

8:00 a.m.-9:38 p.m.

1 stop10h 38m

London

Mon 25/5

6:10 p.m.-9:40 a.m.

2 stops18h 30m

C$ 898

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Wed 29/4

11:35 p.m.-5:04 p.m.

2 stops14h 29m

London

Sun 3/5

6:10 p.m.-10:52 p.m.

2 stops31h 42m

C$ 980

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Wed 29/4

8:00 p.m.-5:04 p.m.

2 stops18h 04m

London

Sun 3/5

12:20 p.m.-9:08 p.m.

1 stop11h 48m

C$ 991

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/4

Sorted by cheapest first

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, January is the cheapest month in which you can book a flight from State of Washington to London, Ontario (average of C$ 184). Flying from State of Washington to London, Ontario in December is currently the most expensive (average of C$ 392). 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 6h 45m. Fly via WestJet or Air Canada to get the fastest option. The distance between State of Washington and London, Ontario is about 3219 km. This flight may include one or multiple stops.

  • 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, January is the cheapest month in which you can book a flight from State of Washington to London, Ontario (average of C$ 184). Flying from State of Washington to London, Ontario in December is currently the most expensive (average of C$ 392). 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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