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Cheap flights from London, ON to Washington from C$ 231
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 12/10. Fares are subject to change and may not be available on all flights or dates of travel.
YXU — SEA
15 Oct — 22 Oct1
Cheap flight deals from London to Washington
Keep the following information in mind while searching for London to Washington flight deals. Data was last updated 15 September 2025.
Find flight deals from London to Washington
Cheapest flights from London to WashingtonExplore 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 15 September 2025.
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 15 September 2025.
Mon 8/128:10 p.m.YXU - SEA
1 stop21h 10mWestJet
Tue 27/13:10 p.m.SEA - YXU
1 stop12h 24mWestJet
Deal found 14/9C$ 363
Sun 14/128:10 p.m.YXU - SEA
1 stop21h 10mWestJet
Tue 27/13:10 p.m.SEA - YXU
1 stop12h 24mWestJet
Deal found 14/9C$ 365
Sun 7/128:10 p.m.YXU - SEA
1 stop21h 10mWestJet
Mon 26/13:10 p.m.SEA - YXU
1 stop12h 24mWestJet
Deal found 14/9C$ 373
Fri 5/125:45 a.m.YXU - SEA
2 stops11h 46mAir Canada
Tue 27/15:50 a.m.SEA - YXU
2 stops12h 31mAir Canada
Deal found 14/9C$ 379
Thu 11/128:10 p.m.YXU - SEA
2 stops17h 13mWestJet
Thu 29/13:10 p.m.SEA - YXU
1 stop12h 24mWestJet
Deal found 14/9C$ 381
Mon 17/118:10 p.m.YXU - SEA
1 stop21h 10mWestJet
Tue 2/123:10 p.m.SEA - YXU
1 stop25h 02mWestJet
Deal found 14/9C$ 409
Sun 14/128:10 p.m.YXU - SEA
2 stops17h 13mWestJet
Mon 26/13:10 p.m.SEA - YXU
1 stop12h 24mWestJet
Deal found 14/9C$ 410
Sun 7/128:10 p.m.YXU - SEA
2 stops17h 13mWestJet
Tue 27/13:10 p.m.SEA - YXU
1 stop12h 24mWestJet
Deal found 14/9C$ 417
Tue 4/118:10 p.m.YXU - SEA
1 stop21h 10mWestJet
Tue 16/123:10 p.m.SEA - YXU
1 stop12h 24mWestJet
Deal found 14/9C$ 419
Sun 16/118:10 p.m.YXU - SEA
2 stops17h 13mWestJet
Tue 2/123:10 p.m.SEA - YXU
1 stop25h 02mWestJet
Deal found 14/9C$ 420
Wed 3/125:45 a.m.YXU - SEA
2 stops19h 21mAir Canada
Mon 19/18:00 p.m.SEA - YXU
2 stops9h 46mAir Canada
Deal found 14/9C$ 421
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 15 September 2025.
Use the filters below to find and compare flights from London to Washington that are best for you.
Fly from
London
Fly to
Washington
Route
Depart
Return
Price
LondonSeattle
YXU - SEA
YXUSEA
London
Tue 16/12
5:40 p.m.-10:16 p.m.
1 stop7h 36m
Seattle/Tacoma Intl
Wed 28/1
5:50 a.m.-9:21 p.m.
2 stops12h 31m
C$ 379
LondonSeattle
YXU - SEA
YXUSEA
London
Thu 4/12
5:40 p.m.-10:16 p.m.
1 stop7h 36m
Seattle/Tacoma Intl
Wed 21/1
8:15 a.m.-9:21 p.m.
1 stop10h 06m
C$ 428
LondonSeattle
YXU - SEA
YXUSEA
London
Sat 29/11
9:25 a.m.-10:06 p.m.
2 stops15h 41m
Seattle/Tacoma Intl
Tue 20/1
5:50 a.m.-9:21 p.m.
2 stops12h 31m
C$ 428
LondonSeattle
YXU - SEA
YXUSEA
London
Mon 1/12
8:10 p.m.-2:20 p.m.
1 stop21h 10m
Seattle/Tacoma Intl
Mon 19/1
3:10 p.m.-6:34 a.m.
1 stop12h 24m
C$ 437
LondonSeattle
YXU - SEA
YXUSEA
London
Sun 7/12
8:10 p.m.-2:20 p.m.
1 stop21h 10m
Seattle/Tacoma Intl
Thu 29/1
3:10 p.m.-6:34 a.m.
1 stop12h 24m
C$ 437
LondonSeattle
YXU - SEA
YXUSEA
London
Tue 9/12
8:10 p.m.-2:20 p.m.
1 stop21h 10m
Seattle/Tacoma Intl
Wed 28/1
3:10 p.m.-6:34 a.m.
1 stop12h 24m
C$ 437
LondonSeattle
YXU - SEA
YXUSEA
London
Wed 10/12
8:10 p.m.-2:20 p.m.
1 stop21h 10m
Seattle/Tacoma Intl
Thu 29/1
3:10 p.m.-6:34 a.m.
1 stop12h 24m
C$ 437
LondonSeattle
YXU - SEA
YXUSEA
London
Mon 8/12
8:10 p.m.-2:20 p.m.
1 stop21h 10m
Seattle/Tacoma Intl
Thu 29/1
3:10 p.m.-6:34 a.m.
1 stop12h 24m
C$ 437
LondonSeattle
YXU - SEA
YXUSEA
London
Sun 14/12
8:10 p.m.-2:20 p.m.
1 stop21h 10m
Seattle/Tacoma Intl
Sun 25/1
3:10 p.m.-6:34 a.m.
1 stop12h 24m
C$ 437
LondonSeattle
YXU - SEA
YXUSEA
London
Wed 10/12
5:40 p.m.-10:16 p.m.
1 stop7h 36m
Seattle/Tacoma Intl
Fri 30/1
12:40 p.m.-5:05 p.m.
3 stops25h 25m
C$ 463
Showing 1-10 of 22 results
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, January is the cheapest month in which you can book a flight from London, Ontario to State of Washington (average of C$ 262). Flying from London, Ontario to State of Washington in December is currently the most expensive (average of C$ 353). 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.
What is the cheapest time of day to fly from YXU to WA?
Find hourly flight availability from London to Washington. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 15 September 2025.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London, Ontario to State of Washington as you normally would.
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 15 September 2025.
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.
Entertainment
7.1
Overall
7.4
Comfort
7.3
Boarding
7.7
Crew
8.1
Food
6.6
Reviews
1 / 20
10.0
ExcellentAnonymous,Sep 2025
FRA - SFO
Entertainment
7.1
Overall
7.4
Comfort
7.3
Boarding
7.7
Crew
8.1
Food
6.6
Reviews
1 / 20
10.0
ExcellentAnonymous,Sep 2025
FRA - SFO
Entertainment
7.1
Overall
7.4
Comfort
7.3
Boarding
7.7
Crew
8.1
Food
6.6
Reviews
1 / 20
10.0
ExcellentAnonymous,Sep 2025
FRA - SFO
Entertainment
7.1
Overall
7.4
Comfort
7.3
Boarding
7.7
Crew
8.1
Food
6.6
Reviews
1 / 20
10.0
ExcellentAnonymous,Sep 2025
FRA - SFO
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.
Browse thousands of different options on Cheapflights for your next trip
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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.
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 15 September 2025.
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!