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Cheap flights from London, ON to Washington from C$ 339

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 12/5. Fares are subject to change and may not be available on all flights or dates of travel.
YXU — SEA
2 May — 9 May1
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 2 April 2026.

Wed 29/46:10 a.m.
YXU
-
SEA
1 stop15h 35m
WestJet
Wed 6/57:35 p.m.
SEA
-
YXU
1 stop6h 45m
WestJet
Deal found 31/3C$ 443
Wed 26/85:55 p.m.
YXU
-
SEA
1 stop18h 45m
WestJet
Tue 8/97:35 p.m.
SEA
-
YXU
1 stop6h 45m
WestJet
Deal found 29/3C$ 522
Thu 16/75:55 p.m.
YXU
-
SEA
1 stop30h 05m
WestJet
Thu 30/77:00 a.m.
SEA
-
YXU
1 stop6h 45m
WestJet
Deal found 29/3C$ 533
Tue 11/88:40 p.m.
YXU
-
SEA
1 stop16h 00m
WestJet
Tue 25/87:35 p.m.
SEA
-
YXU
1 stop6h 45m
WestJet
Deal found 30/3C$ 560
Wed 12/83:30 p.m.
YXU
-
SEA
1 stop8h 37m
Air Canada
Sun 23/88:00 a.m.
SEA
-
YXU
1 stop6h 45m
Air Canada
Deal found 30/3C$ 572
Wed 6/56:10 a.m.
YXU
-
SEA
1 stop15h 35m
WestJet
Sat 9/510:30 a.m.
SEA
-
YXU
1 stop15h 50m
WestJet
Deal found 31/3C$ 581
Wed 12/86:10 a.m.
YXU
-
SEA
1 stop15h 35m
WestJet
Tue 25/87:35 p.m.
SEA
-
YXU
1 stop6h 45m
WestJet
Deal found 30/3C$ 582
Thu 23/48:00 a.m.
YXU
-
SEA
1 stop9h 19m
WestJet
Tue 28/410:30 a.m.
SEA
-
YXU
1 stop27h 15m
WestJet
Deal found 31/3C$ 586
Wed 26/83:30 p.m.
YXU
-
SEA
1 stop8h 37m
Air Canada
Tue 8/93:00 p.m.
SEA
-
YXU
2 stops14h 55m
Air Canada
Deal found 29/3C$ 590
Thu 16/73:30 p.m.
YXU
-
SEA
1 stop8h 37m
Air Canada
Mon 20/77:20 p.m.
SEA
-
YXU
2 stops13h 25m
Air Canada
Deal found 27/3C$ 603
Mon 10/86:10 a.m.
YXU
-
SEA
1 stop17h 50m
WestJet
Mon 24/87:35 p.m.
SEA
-
YXU
1 stop6h 45m
WestJet
Deal found 30/3C$ 607
Thu 28/55:10 a.m.
YXU
-
PDX
2 stops12h 35m
Air Canada
Mon 1/67:45 p.m.
PDX
-
YXU
2 stops10h 08m
Air Canada
Deal found 31/3C$ 665

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 2 April 2026.

Round-trip from

C$ 443

One-way from

C$ 339
WestJet
  • WestJet
  • 29/4-6/5
  • 2 total stops
  • 22h 20m total
  • London to Washington
Search Deals
WestJet
  • WestJet
  • 12/5
  • 1 total stop
  • 18h 45m 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 2 April 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

Wed 26/8

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

1 stop18h 45m

Seattle/Tacoma Intl

Tue 8/9

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

1 stop6h 45m

C$ 522

LondonSeattle

YXU - SEA

YXUSEA

London

Thu 16/7

5:55 p.m.-9:00 p.m.

1 stop30h 05m

Seattle/Tacoma Intl

Thu 30/7

7:00 a.m.-4:45 p.m.

1 stop6h 45m

C$ 533

LondonSeattle

YXU - SEA

YXUSEA

London

Wed 6/5

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

1 stop15h 35m

Seattle/Tacoma Intl

Sat 9/5

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

1 stop15h 50m

C$ 581

LondonSeattle

YXU - SEA

YXUSEA

London

Wed 26/8

3:30 p.m.-9:07 p.m.

1 stop8h 37m

Seattle/Tacoma Intl

Tue 8/9

3:00 p.m.-8:55 a.m.

2 stops14h 55m

C$ 590

LondonSeattle

YXU - SEA

YXUSEA

London

Fri 5/6

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

1 stop8h 38m

Seattle/Tacoma Intl

Tue 9/6

7:20 p.m.-5:33 p.m.

2 stops19h 13m

C$ 615

LondonSeattle

YXU - SEA

YXUSEA

London

Wed 29/4

5:10 a.m.-3:05 p.m.

2 stops12h 55m

Seattle/Tacoma Intl

Wed 6/5

7:20 p.m.-5:33 p.m.

2 stops19h 13m

C$ 633
Quickest round-trip

LondonPortland

YXU - PDX

YXUPDX

London

Thu 28/5

5:10 a.m.-2:45 p.m.

2 stops12h 35m

Portland

Mon 1/6

7:45 p.m.-8:53 a.m.

2 stops10h 08m

C$ 665

LondonPortland

YXU - PDX

YXUPDX

London

Thu 28/5

5:55 p.m.-1:50 p.m.

1 stop22h 55m

Portland

Mon 1/6

2:30 p.m.-4:45 p.m.

1 stop23h 15m

C$ 677
Cheapest one-way

LondonSeattle

YXU - SEA

YXUSEA

London

Tue 12/5

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

1 stop18h 45m

C$ 339
Quickest one-way

LondonPortland

YXU - PDX

YXUPDX

London

Tue 12/5

9:30 a.m.-7:05 p.m.

2 stops12h 35m

C$ 364

Flights are sorted by cheapest round-trip flights first.

Deals found on 28/3

Showing 1-10 of 15 resultsSorted by cheapest first
1
2

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

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

Currently, December is the cheapest month in which you can book a flight from London, Ontario to State of Washington (average of C$ 182). Flying from London, Ontario to State of Washington in July is currently the most expensive (average of C$ 328). 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.

Reviews of airlines servicing Washington

Get insights into the airlines that provide service to Washington. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Washington. Reviews last updated 2 April 2026.
Check out reviews from past customers who have flown with United Airlines,WestJet, andAir Canada from London to Washington to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,533 reviews
Check prices

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats
United Airlines
7.4
Good
9,533 reviews
United Airlines
7.4
Good
9,533 reviews
Check prices

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats
WestJet
7.2
Good
3,309 reviews
United Airlines
7.4
Good
9,533 reviews
Check prices

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats
Air Canada
7.1
Good
10,881 reviews
United Airlines
7.4
Good
9,533 reviews
Check prices

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats

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$ 590, WestJet can have you in State of Washington from London, Ontario in 8h 37m. 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.

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

    Currently, December is the cheapest month in which you can book a flight from London, Ontario to State of Washington (average of C$ 182). Flying from London, Ontario to State of Washington in July is currently the most expensive (average of C$ 328). 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

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Alternative routes for London to Washington

See prices for flight routes from nearby airports that may be better suited for you.
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Top 3 airlines flying from London to Washington

Discover the top 3 airlines that operate flights from London to Washington. 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 629,999 searches. Data last updated 2 April 2026.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 243AverageC$ 391FlexibilityNo cancel feeOn-time60%
Search WestJet flights
United AirlinesCheapestC$ 279AverageC$ 297FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 371AverageC$ 453FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

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.

Why should you use Cheapflights to find cheap flight tickets from London to Washington?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from London to Washington for you. Better yet — we are completely free to use.

Can Cheapflights find flights from London to Washington with no change fees?

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.

Can Cheapflights notify me if prices for flights from London to Washington become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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