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Cheap flights from London, ON to Washington from C$ 336

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 1/9. Fares are subject to change and may not be available on all flights or dates of travel.
YXU — SEA
3 Sep — 10 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from London to Washington

Enter your travel dates to find the best prices.

Cheapest flights from London to Washington
Explore the most affordable flight options available from London to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 4 August 2026.

Thu 24/96:10 a.m.
YXU
-
SEA
1 stop15h 35m
WestJet
Mon 28/97:35 p.m.
SEA
-
YXU
1 stop6h 45m
WestJet
Deal found 30/7C$ 528
Mon 14/95:55 p.m.
YXU
-
SEA
1 stop18h 45m
WestJet
Mon 21/97:35 p.m.
SEA
-
YXU
1 stop6h 45m
WestJet
Deal found 31/7C$ 567
Wed 23/96:10 a.m.
YXU
-
SEA
1 stop15h 35m
WestJet
Mon 28/97:35 p.m.
SEA
-
YXU
1 stop6h 45m
WestJet
Deal found 30/7C$ 580
Wed 23/96:10 a.m.
YXU
-
SEA
2 stops18h 50m
Multiple Airlines
Mon 28/97:35 p.m.
SEA
-
YXU
1 stop6h 45m
Multiple Airlines
Deal found 30/7C$ 619
Fri 14/82:40 p.m.
YXU
-
SEA
2 stops22h 00m
WestJet
Sat 22/87:00 a.m.
SEA
-
YXU
1 stop6h 45m
WestJet
Deal found 30/7C$ 640
Thu 17/95:55 p.m.
YXU
-
SEA
1 stop18h 45m
WestJet
Sat 19/97:35 p.m.
SEA
-
YXU
1 stop6h 45m
WestJet
Deal found 3/8C$ 675
Thu 17/93:30 p.m.
YXU
-
SEA
2 stops10h 17m
Air Canada
Sat 19/98:00 a.m.
SEA
-
YXU
1 stop6h 43m
Air Canada
Deal found 3/8C$ 715
Thu 24/96:10 a.m.
YXU
-
SEA
1 stop15h 35m
Multiple Airlines
Mon 28/91:42 p.m.
SEA
-
YXU
2 stops12h 38m
Multiple Airlines
Deal found 30/7C$ 719
Wed 23/910:05 a.m.
YXU
-
SEA
2 stops11h 27m
Air Canada
Mon 28/97:15 p.m.
SEA
-
YXU
2 stops11h 05m
Air Canada
Deal found 30/7C$ 723
Mon 14/93:30 p.m.
YXU
-
SEA
2 stops10h 17m
Air Canada
Mon 21/98:00 a.m.
SEA
-
YXU
1 stop6h 43m
Air Canada
Deal found 31/7C$ 747
Wed 4/113:25 p.m.
YXU
-
SEA
1 stop8h 34m
Air Canada
Wed 25/117:45 a.m.
SEA
-
YXU
1 stop11h 07m
Air Canada
Deal found 1/8C$ 766
Tue 22/910:05 a.m.
YXU
-
PDX
2 stops15h 40m
United Airlines
Sat 26/95:30 a.m.
PDX
-
YXU
2 stops13h 10m
United Airlines
Deal found 30/7C$ 869

Find flight deals from London to Washington

Keep the following information in mind while searching for London to Washington flight deals. Data was last updated 4 August 2026.

Round-trip from

C$ 528

One-way from

C$ 336
WestJet
  • WestJet
  • 24/9-28/9
  • 2 total stops
  • 22h 20m total
  • London to Washington
Search Deals
WestJet
  • WestJet
  • 1/9
  • 1 total stop
  • 20h 10m total
  • London to Washington
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from London to Washington 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 4 August 2026.
Use the filters below to find and compare flights from London to Washington that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonSeattle

YXU - SEA

YXUSEA

London

Mon 14/9

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

1 stop18h 45m

Seattle/Tacoma Intl

Mon 21/9

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

1 stop6h 45m

C$ 567

LondonSeattle

YXU - SEA

YXUSEA

London

Wed 23/9

6:10 a.m.-6:45 p.m.

1 stop15h 35m

Seattle/Tacoma Intl

Mon 28/9

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

1 stop6h 45m

C$ 580

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 17/9

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

1 stop18h 45m

Seattle/Tacoma Intl

Sat 19/9

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

1 stop6h 45m

C$ 675
Quickest round-trip

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 17/9

3:30 p.m.-10:47 p.m.

2 stops10h 17m

Seattle/Tacoma Intl

Sat 19/9

8:00 a.m.-5:43 p.m.

1 stop6h 43m

C$ 715

LondonPortland

YXU - PDX

YXUPDX

London

Tue 22/9

10:05 a.m.-10:45 p.m.

2 stops15h 40m

Portland

Sat 26/9

5:30 a.m.-9:40 p.m.

2 stops13h 10m

C$ 869

LondonPortland

YXU - PDX

YXUPDX

London

Tue 22/9

5:40 a.m.-2:46 p.m.

2 stops12h 06m

Portland

Sat 26/9

7:45 p.m.-5:43 p.m.

2 stops18h 58m

C$ 882
Cheapest one-way

LondonPortland

YXU - PDX

YXUPDX

London

Tue 1/9

8:40 p.m.-1:50 p.m.

1 stop20h 10m

C$ 336

LondonPortland

YXU - PDX

YXUPDX

London

Tue 1/9

2:40 p.m.-9:48 a.m.

3 stops22h 08m

C$ 410
Quickest one-way

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 17/9

3:30 p.m.-9:04 p.m.

1 stop8h 34m

C$ 441

LondonPortland

YXU - PDX

YXUPDX

London

Tue 15/9

6:20 p.m.-9:50 a.m.

2 stops18h 30m

C$ 484

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/8

Showing 1-10 of 12 resultsSorted by cheapest first
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Best time to book a flight from London to Washington

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

No data available for this route at this time. Please check back soon.

Related info for your journey

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

    Most people fly from London (YXU) if they book a flight from London to Washington. London is conveniently located just 8.6 km from London’s city centre.

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

    For as low as C$ 715, WestJet can have you in State of Washington from London, Ontario in 10h 17m. The distance between London, Ontario and State of Washington is about 3219 km. This flight may include one or multiple stops.

  • What are the most popular routes from London, Ontario to State of Washington?

    The most popular flight routes from London, Ontario to State of Washington are London - Seattle/Tacoma Intl, London - Portland and London - Wenatchee Pangborn Field.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from London to Washington by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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Alternative routes for London to Washington

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How does Cheapflights help users find flights from London to Washington?

Deals for London to Washington flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

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Cheapflights does show flights with no change fees to all users. To see these options for flights from London to Washington, users can toggle the no change fees filter when performing a flight search.

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