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$506+ Cheap flights from Dulles Intl (IAD) to London, ON (YXU)

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 12/20. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — YXU
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
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Cheap flight deals from Dulles Intl to London

Cheapest flights from Dulles Intl to London
Explore the most affordable flight options available from Dulles Intl to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 12, 2025.

This Air Canada deal was found by Cheapflights users on 12/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/314:30 pmIAD - YXU
1 stop4h 51mAir Canada
Fri 1/29:25 amYXU - IAD
1 stop6h 21mAir Canada
Deal found 12/10$659
This United Airlines deal was found by Cheapflights users on 12/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/318:15 amIAD - YXU
2 stops13h 06mUnited Airlines
Fri 1/25:10 amYXU - IAD
2 stops12h 20mUnited Airlines
Deal found 12/10$810

Find flight deals from Dulles Intl to London

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to London (YXU). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 12, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$521
(Air Canada)

One-way from

$506
(United Airlines)
Provider with most accurate pricing for Washington, D.C. Dulles Intl-London flight deals.
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Provider most trusted by Cheapflights users for Washington, D.C. Dulles Intl-London flights.
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From Washington, D.C. Dulles Intl to London
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One-way flight from Washington, D.C. Dulles Intl to London
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Dulles Intl 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 2,558,603 searches. Data last updated December 12, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to London that are best for you.

Fly from

Dulles Intl

Fly to

London

Route

Depart

Return

Price

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Thu 1/22

4:30 pm-9:21 pm

1 stop4h 51m

London

Mon 1/26

9:50 am-3:46 pm

1 stop5h 56m

$521

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Sat 1/10

4:30 pm-9:20 pm

1 stop4h 50m

London

Sat 1/17

9:50 am-3:46 pm

1 stop5h 56m

$521

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Sun 1/25

4:30 pm-9:20 pm

1 stop4h 50m

London

Sun 2/1

9:25 am-3:49 pm

1 stop6h 24m

$521

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Sat 1/24

4:30 pm-9:20 pm

1 stop4h 50m

London

Sat 1/31

9:50 am-3:46 pm

1 stop5h 56m

$521

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Sat 12/20

10:33 pm-5:05 pm

2 stops18h 32m

$506

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Sat 12/20

10:06 pm-8:46 am

1 stop10h 40m

$520

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Sat 12/20

5:29 pm-6:34 am

3 stops37h 05m

$852

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Compare providers for flights from Dulles Intl to London

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Dulles Intl to London in December.
ProviderPrice AccuracyTrust Score*
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
ExpediaPrice Accuracy2 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-London, Ontario flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Washington, D.C. Dulles Intl Airport-London, Ontario flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-London, Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-London, Ontario flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C. Dulles Intl Airport-London, Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Dulles Intl to London

Have a flexible travel schedule? Discover the best time to fly to London from Dulles Intl 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, D.C. Dulles Intl Airport to London

What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to London, Ontario?

Currently, March is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London, Ontario (average of $98). Flying from Washington, D.C. Dulles Intl Airport to London, Ontario in July is currently the most expensive (average of $236). 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 Dulles Intl 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, D.C. Dulles Intl?

    London (YXU) is the airport you will fly into if you book a flight from Washington, D.C. Dulles Intl to London. You should not have trouble finding flights to London from Washington, D.C. Dulles Intl; the airport handles an average of 0 inbound flights from Washington, D.C. Dulles Intl per day. You should also have plenty of airline options to choose from since 0 airlines have flights to the London airport from Washington, D.C. Dulles Intl. It is only a 5.3 mi journey from London (YXU) to London’s city center.

  • How long is the flight from Washington, D.C. Dulles Intl Airport to London, Ontario?

    Departing from Washington, D.C. Dulles Intl Airport to London, Ontario will take you 4h 51m. The distance from Washington, D.C. Dulles Intl Airport to London, Ontario is about 341 mi.

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

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

  • How can I find direct flights from Dulles Intl to London?

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

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

    Yes. Cheapflights offers flight deals from Dulles Intl 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 Washington, D.C. Dulles Intl Airport to London, Ontario?

    Currently, March is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London, Ontario (average of $98). Flying from Washington, D.C. Dulles Intl Airport to London, Ontario in July is currently the most expensive (average of $236). 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.

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