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Cheap flights from Washington, D.C. Dulles Intl Airport to London from $252

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 8/11. 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 - 9:19 pm
IAD
-
YXU
4h 49m
1 stop
Air Canada Logo
9:25 am - 7:40 pm
YXU
-
IAD
10h 15m
2 stops
$556Air Canada
Tue, Apr 28 - Wed, Apr 29
Air Canada Logo
9:55 am - 9:19 pm
IAD
-
YXU
11h 24m
2 stops
Air Canada Logo
9:25 am - 7:40 pm
YXU
-
IAD
10h 15m
2 stops
$564Air Canada
Tue, Apr 28 - Wed, Apr 29
Air Canada Logo
4:30 pm - 9:19 pm
IAD
-
YXU
4h 49m
1 stop
Air Canada Logo
9:25 am - 3:39 pm
YXU
-
IAD
6h 14m
1 stop
$569Air Canada
Sat, Apr 18 - Sat, Apr 25
Air Canada Logo
4:30 pm - 9:19 pm
IAD
-
YXU
4h 49m
1 stop
Air Canada Logo
9:25 am - 8:29 pm
YXU
-
IAD
11h 04m
1 stop
$572Air Canada
Tue, Apr 28 - Wed, Apr 29
Air Canada Logo
4:30 pm - 9:19 pm
IAD
-
YXU
4h 49m
1 stop
Air Canada Logo
9:25 am - 7:40 pm
YXU
-
IAD
10h 15m
2 stops
$577Air Canada
Tue, Apr 28 - Wed, Apr 29
Air Canada Logo
9:55 am - 9:19 pm
IAD
-
YXU
11h 24m
2 stops
Air Canada Logo
9:25 am - 7:40 pm
YXU
-
IAD
10h 15m
2 stops
$586Air Canada
Tue, Apr 28 - Wed, Apr 29
Air Canada Logo
9:00 am - 5:04 pm
IAD
-
YXU
8h 04m
1 stop
Air Canada Logo
9:25 am - 3:39 pm
YXU
-
IAD
6h 14m
1 stop
$593Air Canada
Thu, Apr 16 - Thu, Apr 23
Air Canada Logo
4:30 pm - 9:19 pm
IAD
-
YXU
4h 49m
1 stop
Air Canada Logo
9:25 am - 8:29 pm
YXU
-
IAD
11h 04m
1 stop
$594Air Canada
Tue, Apr 28 - Wed, Apr 29
Air Canada Logo
4:30 pm - 9:19 pm
IAD
-
YXU
4h 49m
1 stop
Air Canada Logo
9:25 am - 3:39 pm
YXU
-
IAD
6h 14m
1 stop
$605Air Canada
Fri, Apr 3 - Mon, Apr 6
Air Canada Logo
9:55 am - 5:05 pm
IAD
-
YXU
7h 10m
2 stops
Air Canada Logo
9:40 am - 3:46 pm
YXU
-
IAD
6h 06m
1 stop
$627Air Canada
Sat, Mar 21 - Sun, Mar 22

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
Apr 14
IAD8:23 amWashington, D.C. Dulles Intl
8h 41m
2 stops
YXU5:04 pmLondon
Apr 21
YXU9:25 amLondon
4h 59m
1 stop
IAD2:24 pmWashington, D.C. Dulles Intl
$654
United Airlines
Mar 17
IAD4:30 pmWashington, D.C. Dulles Intl
4h 51m
1 stop
YXU9:21 pmLondon
Mar 20
YXU9:40 amLondon
6h 06m
1 stop
IAD3:46 pmWashington, D.C. Dulles Intl
$665
United Airlines
Apr 14
IAD1:10 pmWashington, D.C. Dulles Intl
8h 09m
2 stops
YXU9:19 pmLondon
Apr 21
YXU9:25 amLondon
7h 05m
2 stops
IAD4:30 pmWashington, D.C. Dulles Intl
$669

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
Apr 28
IAD4:30 pmWashington, D.C. Dulles Intl
4h 49m
1 stop
YXU9:19 pmLondon
Apr 29
YXU9:25 amLondon
10h 15m
2 stops
IAD7:40 pmWashington, D.C. Dulles Intl
$556
Air Canada
Apr 28
IAD9:55 amWashington, D.C. Dulles Intl
11h 24m
2 stops
YXU9:19 pmLondon
Apr 29
YXU9:25 amLondon
10h 15m
2 stops
IAD7:40 pmWashington, D.C. Dulles Intl
$564
Air Canada
Apr 18
IAD4:30 pmWashington, D.C. Dulles Intl
4h 49m
1 stop
YXU9:19 pmLondon
Apr 25
YXU9:25 amLondon
6h 14m
1 stop
IAD3:39 pmWashington, D.C. Dulles Intl
$569

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 March 4, 2026.
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

Tue 4/28

4:30 pm-9:19 pm

1 stop4h 49m

London

Wed 4/29

9:25 am-7:40 pm

2 stops10h 15m

$556

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Tue 4/28

9:55 am-9:19 pm

2 stops11h 24m

London

Wed 4/29

9:25 am-7:40 pm

2 stops10h 15m

$564

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Sat 4/18

4:30 pm-9:19 pm

1 stop4h 49m

London

Sat 4/25

9:25 am-3:39 pm

1 stop6h 14m

$569

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Tue 4/28

4:30 pm-9:19 pm

1 stop4h 49m

London

Wed 4/29

9:25 am-8:29 pm

1 stop11h 04m

$572

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Tue 4/28

4:30 pm-9:19 pm

1 stop4h 49m

London

Wed 4/29

9:25 am-7:40 pm

2 stops10h 15m

$577

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Tue 4/28

9:55 am-9:19 pm

2 stops11h 24m

London

Wed 4/29

9:25 am-7:40 pm

2 stops10h 15m

$586

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Thu 4/16

9:00 am-5:04 pm

1 stop8h 04m

London

Thu 4/23

9:25 am-3:39 pm

1 stop6h 14m

$593

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Tue 4/28

4:30 pm-9:19 pm

1 stop4h 49m

London

Wed 4/29

9:25 am-8:29 pm

1 stop11h 04m

$594

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Fri 4/3

4:30 pm-9:19 pm

1 stop4h 49m

London

Mon 4/6

9:25 am-3:39 pm

1 stop6h 14m

$605

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Sat 3/21

9:55 am-5:05 pm

2 stops7h 10m

London

Sun 3/22

9:40 am-3:46 pm

1 stop6h 06m

$627

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 18 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 airline that flies from Washington, D.C. Dulles Intl to London?

Air Canada and United Airlines are the most popular carriers operating from Washington, D.C. Dulles Intl to London

What airlines fly to London, Ontario?

Air Canada, United Airlines and Porter Airlines are the top three most popular airlines that fly to London, Ontario from Washington, D.C. Dulles Intl Airport according to our data. Air Canada is the first choice among our users, with 63% of people opting to fly with this airline when traveling to London, Ontario. Keep in mind that there are 3 different airlines that fly to London, Ontario on a routine basis, so you have a few additional options to choose from.

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

Fastest flight time

4h 49m

Direct flights

None
The fastest flight from Washington, D.C. Dulles Intl Airport to London, Ontario takes 4h 49m
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.
Search flight deals

  • 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 49m.

  • 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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