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

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. Dulles Intl Airport to London departing on 12/6. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Washington, D.C. Dulles Intl Airport to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
Air Canada Logo
4:30 pm - 9:21 pmIAD-YXU
4h 51m1 stop
Air Canada Logo
9:25 am - 3:46 pmYXU-IAD
6h 21m1 stop
$593Air Canada
Find Deal
Sat, Dec 6 - Sat, Dec 13
Air Canada Logo
4:30 pm - 9:21 pmIAD-YXU
4h 51m1 stop
Air Canada Logo
9:25 am - 3:46 pmYXU-IAD
6h 21m1 stop
$594Air Canada
Find Deal
Fri, Dec 5 - Fri, Dec 12
Air Canada Logo
4:30 pm - 9:18 pmIAD-YXU
4h 48m1 stop
Air Canada Logo
9:25 am - 3:55 pmYXU-IAD
6h 30m1 stop
$618Air Canada
Find Deal
Sun, Apr 5 - Sat, Apr 11
Multiple Airlines Logo
4:30 pm - 9:18 pmIAD-YXU
4h 48m1 stop
Multiple Airlines Logo
5:10 am - 1:01 pmYXU-IAD
7h 51m2 stops
$663Multiple Airlines
Find Deal
Sun, Apr 5 - Sat, Apr 11
Air Canada Logo
9:45 am - 5:05 pmIAD-YXU
7h 20m2 stops
Air Canada Logo
9:25 am - 3:46 pmYXU-IAD
6h 21m1 stop
$672Air Canada
Find Deal
Fri, Dec 5 - Fri, Dec 12
United Airlines Logo
4:30 pm - 9:21 pmIAD-YXU
4h 51m1 stop
United Airlines Logo
5:40 pm - 9:20 pmYXU-IAD
3h 40m1 stop
$680United Airlines
Find Deal
Fri, Dec 5 - Fri, Dec 12
United Airlines Logo
1:10 pm - 9:21 pmIAD-YXU
8h 11m2 stops
United Airlines Logo
9:25 am - 3:46 pmYXU-IAD
6h 21m1 stop
$689United Airlines
Find Deal
Sat, Dec 6 - Sat, Dec 13
Multiple Airlines Logo
8:15 am - 5:03 pmIAD-YXU
8h 48m2 stops
Multiple Airlines Logo
5:10 am - 11:16 amYXU-IAD
6h 06m2 stops
$693Multiple Airlines
Find Deal
Sun, Apr 5 - Sat, Apr 11
United Airlines Logo
6:00 am - 5:05 pmIAD-YXU
11h 05m2 stops
United Airlines Logo
9:25 am - 5:30 pmYXU-IAD
8h 05m2 stops
$705United Airlines
Find Deal
Fri, Dec 5 - Fri, Dec 12
United Airlines Logo
8:45 am - 5:05 pmIAD-YXU
8h 20m2 stops
United Airlines Logo
9:25 am - 5:30 pmYXU-IAD
8h 05m2 stops
$737United Airlines
Find Deal
Sat, Dec 6 - Sat, Dec 13

United Airlines flights from Washington, D.C. Dulles Intl Airport to London, Ontario

Our best United Airlines deals on Washington, D.C. Dulles Intl Airport to London, Ontario flight tickets
United Airlines
Dec 5
IAD4:30 pmWashington, D.C. Dulles Intl
4h 51m
1 stop
YXU9:21 pmLondon
Dec 12
YXU5:40 pmLondon
3h 40m
1 stop
IAD9:20 pmWashington, D.C. Dulles Intl
$680
Find similar
United Airlines
Dec 6
IAD1:10 pmWashington, D.C. Dulles Intl
8h 11m
2 stops
YXU9:21 pmLondon
Dec 13
YXU9:25 amLondon
6h 21m
1 stop
IAD3:46 pmWashington, D.C. Dulles Intl
$689
Find similar
United Airlines
Dec 5
IAD6:00 amWashington, D.C. Dulles Intl
11h 05m
2 stops
YXU5:05 pmLondon
Dec 12
YXU9:25 amLondon
8h 05m
2 stops
IAD5:30 pmWashington, D.C. Dulles Intl
$705
Find similar

Air Canada flights from Washington, D.C. Dulles Intl Airport to London, Ontario

Our best Air Canada deals on Washington, D.C. Dulles Intl Airport to London, Ontario flight tickets
Air Canada
Dec 6
IAD4:30 pmWashington, D.C. Dulles Intl
4h 51m
1 stop
YXU9:21 pmLondon
Dec 13
YXU9:25 amLondon
6h 21m
1 stop
IAD3:46 pmWashington, D.C. Dulles Intl
$593
Find similar
Air Canada
Dec 5
IAD4:30 pmWashington, D.C. Dulles Intl
4h 51m
1 stop
YXU9:21 pmLondon
Dec 12
YXU9:25 amLondon
6h 21m
1 stop
IAD3:46 pmWashington, D.C. Dulles Intl
$594
Find similar
Air Canada
Apr 5
IAD4:30 pmWashington, D.C. Dulles Intl
4h 48m
1 stop
YXU9:18 pmLondon
Apr 11
YXU9:25 amLondon
6h 30m
1 stop
IAD3:55 pmWashington, D.C. Dulles Intl
$618
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. Dulles Intl Airport to London, Ontario 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, momondo users made 832,500 searches. Data last updated October 23, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to London, Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Sat 12/6

4:30 pm-9:21 pm

1 stop4h 51m

London

Sat 12/13

9:25 am-3:46 pm

1 stop6h 21m

$593

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Fri 12/5

4:30 pm-9:21 pm

1 stop4h 51m

London

Fri 12/12

9:25 am-3:46 pm

1 stop6h 21m

$594

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Sun 4/5

4:30 pm-9:18 pm

1 stop4h 48m

London

Sat 4/11

9:25 am-3:55 pm

1 stop6h 30m

$618

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Sun 4/5

4:30 pm-9:18 pm

1 stop4h 48m

London

Sat 4/11

5:10 am-1:01 pm

2 stops7h 51m

$663

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Fri 12/5

9:45 am-5:05 pm

2 stops7h 20m

London

Fri 12/12

9:25 am-3:46 pm

1 stop6h 21m

$672

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Fri 12/5

4:30 pm-9:21 pm

1 stop4h 51m

London

Fri 12/12

5:40 pm-9:20 pm

1 stop3h 40m

$680

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Sat 12/6

1:10 pm-9:21 pm

2 stops8h 11m

London

Sat 12/13

9:25 am-3:46 pm

1 stop6h 21m

$689

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Sun 4/5

8:15 am-5:03 pm

2 stops8h 48m

London

Sat 4/11

5:10 am-11:16 am

2 stops6h 06m

$693

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Fri 12/5

6:00 am-5:05 pm

2 stops11h 05m

London

Fri 12/12

9:25 am-5:30 pm

2 stops8h 05m

$705

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Sat 12/6

8:45 am-5:05 pm

2 stops8h 20m

London

Sat 12/13

9:25 am-5:30 pm

2 stops8h 05m

$737

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 resultsSorted by cheapest first
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See travel insights to London from

How to get the cheapest flight ticket from Washington, D.C. Dulles Intl Airport to London, Ontario

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to London, Ontario?

According to our data, Friday is the cheapest day to fly to London, Ontario from Washington, D.C. Dulles Intl Airport. The lowest ticket price found for a Friday departure recently was $534. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Be sure to avoid booking your departure on a Saturday as prices are generally higher than usual. According to our data, the average ticket price to London, Ontario on Saturday is $556.

What is the cheapest time of day to depart on your flight to London, Ontario?

In the afternoon is the cheapest time of day to fly from Washington, D.C. Dulles Intl Airport to London, Ontario when you can find flight prices for as low as $534. Flying to London, Ontario in the afternoon is an ideal time because this is during off-peak travel hours. In the morning is when there is more demand to fly to London, Ontario, so prices are often more expensive at around $685 per ticket.

When to book flights from Washington, D.C. Dulles Intl Airport to London, Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. Dulles Intl Airport to London, Ontario according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Washington, D.C. Dulles Intl Airport to London, Ontario (IAD to YXU) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. Dulles Intl Airport to London, Ontario

Direct flights

None
There are no direct flights from Washington, D.C. Dulles Intl Airport to London, Ontario. There are no popular flight routes from Washington, D.C. Dulles Intl Airport to London, Ontario.
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  • How far is Washington, D.C. Dulles Intl to London by plane?

    There are 341.3 mi between Washington, D.C. Dulles Intl and London. In terms of flight time, this usually takes a little over 4h 06m.

  • When did momondo last update prices for flights from Washington, D.C. Dulles Intl Airport to London Airport?

    Prices for flights from Washington, D.C. Dulles Intl Airport to London Airport were last updated today.

  • How old do you have to be to fly from Washington, D.C. Dulles Intl Airport to London Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington, D.C. Dulles Intl Airport to London Airport.

  • What documentation or ID do you need to fly to London Airport?

    The travel and health documents required for your trip to London Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at London Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Grand Bend
Port Stanley

Why use momondo?

Why should I use momondo to find a flight deal from Washington, D.C. to London?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Washington, D.C. to London. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Washington, D.C. to London with flexible booking policies on momondo?

Yes. All flights to London from Washington, D.C. on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Washington, D.C. to London?

momondo provides multiple filters to help you find the best flight to London from Washington, D.C.. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Washington, D.C. to London right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to London from Washington, D.C.. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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