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Cheap flights from London, ON to Washington, D.C. Dulles Intl Airport from C$ 320

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 26/1. Fares are subject to change and may not be available on all flights or dates of travel.
YXU — IAD
11 Jan — 18 Jan1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from London to Dulles Intl

Enter your travel dates to find the best prices.

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

Mon 22/129:25 a.m.YXU - IAD
1 stop11h 01mAir Canada
Mon 12/14:30 p.m.IAD - YXU
1 stop4h 50mAir Canada
Deal found 11/12C$ 920
Mon 22/129:25 a.m.YXU - IAD
1 stop6h 21mUnited Airlines
Mon 12/11:05 p.m.IAD - YXU
2 stops8h 15mUnited Airlines
Deal found 11/12C$ 968
Mon 22/128:10 p.m.YXU - IAD
2 stops16h 03mWestJet
Mon 12/112:23 p.m.IAD - YXU
2 stops18h 11mWestJet
Deal found 11/12C$ 1,863
Mon 22/128:10 p.m.YXU - IAD
3 stops21h 04mMultiple Airlines
Mon 12/111:35 a.m.IAD - YXU
3 stops18h 59mMultiple Airlines
Deal found 11/12C$ 2,681

Find flight deals from London to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from London (YXU) to Dulles Intl (IAD). 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 12 December 2025.

Round-trip from

C$ 575

One-way from

C$ 320
Air Canada
  • Air Canada
  • 25/1-1/2
  • 2 total stops
  • 10h 46m total
  • London to Washington, D.C.
Search Deals
Air Canada
  • Air Canada
  • 26/1
  • 1 total stop
  • 5h 56m total
  • London to Washington, D.C.
Search Deals

Cheapflights Fare Finder

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

Fly from

London

Fly to

Dulles Intl

Route

Depart

Return

Price

LondonWashington, D.C.

YXU - IAD

YXUIAD

London

Sun 25/1

9:50 a.m.-3:46 p.m.

1 stop5h 56m

Washington, D.C. Dulles Intl

Sun 1/2

4:30 p.m.-9:20 p.m.

1 stop4h 50m

C$ 575

LondonWashington, D.C.

YXU - IAD

YXUIAD

London

Sun 25/1

9:50 a.m.-3:46 p.m.

1 stop5h 56m

Washington, D.C. Dulles Intl

Thu 29/1

4:30 p.m.-9:21 p.m.

1 stop4h 51m

C$ 579

LondonWashington, D.C.

YXU - IAD

YXUIAD

London

Wed 7/1

9:50 a.m.-3:46 p.m.

1 stop5h 56m

Washington, D.C. Dulles Intl

Thu 8/1

4:30 p.m.-9:21 p.m.

1 stop4h 51m

C$ 630

LondonWashington, D.C.

YXU - IAD

YXUIAD

London

Mon 26/1

9:50 a.m.-3:46 p.m.

1 stop5h 56m

C$ 320

LondonWashington, D.C.

YXU - IAD

YXUIAD

London

Mon 26/1

5:10 a.m.-4:25 p.m.

2 stops11h 15m

C$ 405

LondonWashington, D.C.

YXU - IAD

YXUIAD

London

Mon 26/1

8:10 p.m.-2:09 p.m.

3 stops41h 59m

C$ 412

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/12

Best time to book a flight from London to Dulles Intl

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

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

Currently, February is the cheapest month in which you can book a flight from London, Ontario to Washington, D.C. Dulles Intl Airport (average of C$ 181). Flying from London, Ontario to Washington, D.C. Dulles Intl Airport in December is currently the most expensive (average of C$ 288). 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 London to Dulles Intl. 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, D.C. Dulles Intl?

    Most people fly from London (YXU) if they book a flight from London to Washington, D.C. Dulles Intl. On average, London has 0 outbound flights to Washington, D.C. Dulles Intl per day from 0 airlines. London is conveniently located just 8.6 km from London’s city centre.

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

    Departing from London, Ontario to Washington, D.C. Dulles Intl Airport will take you 5h 56m. Airlines will cover a distance of 549 km.

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

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

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

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

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

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

    Currently, February is the cheapest month in which you can book a flight from London, Ontario to Washington, D.C. Dulles Intl Airport (average of C$ 181). Flying from London, Ontario to Washington, D.C. Dulles Intl Airport in December is currently the most expensive (average of C$ 288). 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 Washington, D.C. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Silver Spring
Warrenton
Winchester
Hanover
Fairfax
Reston
Ellicott City
Oxon Hill
Gaithersburg
Arlington
Herndon
Manassas
Fredericksburg
Alexandria
Rockville

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How does Cheapflights help users find flights from London to Dulles Intl?

Deals for London to Dulles Intl 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 Dulles Intl?

Cheapflights helps you find that perfect flight to Dulles Intl from London by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

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

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

Yes, Cheapflights offers price alerts on London to Dulles Intl flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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