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Cheap flights from Washington, D.C. Dulles Intl Airport to London from $605

This is the cheapest round-trip 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 4/21. 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 - 9:18 pm
IAD
-
YXU
4h 48m1 stop
Air Canada Logo
9:25 am - 3:39 pm
YXU
-
IAD
6h 14m1 stop
$605Air Canada
Tue, Apr 21 - Fri, Apr 24
Air Canada Logo
4:30 pm - 9:18 pm
IAD
-
YXU
4h 48m1 stop
Air Canada Logo
9:25 am - 7:40 pm
YXU
-
IAD
10h 15m2 stops
$614Air Canada
Tue, Apr 21 - Fri, Apr 24
Air Canada Logo
9:55 am - 5:03 pm
IAD
-
YXU
7h 08m2 stops
Air Canada Logo
9:25 am - 7:40 pm
YXU
-
IAD
10h 15m2 stops
$622Air Canada
Tue, Apr 21 - Fri, Apr 24
Air Canada Logo
4:30 pm - 9:20 pm
IAD
-
YXU
4h 50m1 stop
Air Canada Logo
9:50 am - 3:46 pm
YXU
-
IAD
5h 56m1 stop
$670Air Canada
Mon, Jan 12 - Mon, Jan 19
Air Canada Logo
9:45 am - 5:05 pm
IAD
-
YXU
7h 20m2 stops
Air Canada Logo
9:50 am - 3:46 pm
YXU
-
IAD
5h 56m1 stop
$678Air Canada
Mon, Jan 12 - Mon, Jan 19
United Airlines Logo
12:40 pm - 9:20 pm
IAD
-
YXU
8h 40m2 stops
United Airlines Logo
9:25 am - 3:49 pm
YXU
-
IAD
6h 24m1 stop
$701United Airlines
Wed, Feb 4 - Wed, Feb 11
Air Canada Logo
9:45 am - 5:05 pm
IAD
-
YXU
7h 20m2 stops
Air Canada Logo
9:25 am - 4:13 pm
YXU
-
IAD
6h 48m2 stops
$705Air Canada
Wed, Feb 4 - Wed, Feb 11
United Airlines Logo
12:40 pm - 9:20 pm
IAD
-
YXU
8h 40m2 stops
United Airlines Logo
9:25 am - 5:35 pm
YXU
-
IAD
8h 10m2 stops
$716United Airlines
Wed, Feb 4 - Wed, Feb 11
Air Canada Logo
9:45 am - 5:05 pm
IAD
-
YXU
7h 20m2 stops
Air Canada Logo
9:50 am - 8:54 pm
YXU
-
IAD
11h 04m2 stops
$717Air Canada
Mon, Jan 12 - Mon, Jan 19
Multiple Airlines Logo
11:40 am - 6:35 am
IAD
-
YXU
18h 55m3 stops
Multiple Airlines Logo
8:10 pm - 5:14 pm
YXU
-
IAD
21h 04m3 stops
$886Multiple Airlines
Wed, Feb 4 - Wed, Feb 11

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 21
IAD4:30 pmWashington, D.C. Dulles Intl
4h 48m
1 stop
YXU9:18 pmLondon
Apr 24
YXU9:25 amLondon
6h 14m
1 stop
IAD3:39 pmWashington, D.C. Dulles Intl
$605
Find similar
Air Canada
Apr 21
IAD4:30 pmWashington, D.C. Dulles Intl
4h 48m
1 stop
YXU9:18 pmLondon
Apr 24
YXU9:25 amLondon
10h 15m
2 stops
IAD7:40 pmWashington, D.C. Dulles Intl
$614
Find similar
Air Canada
Feb 4
IAD4:30 pmWashington, D.C. Dulles Intl
4h 50m
1 stop
YXU9:20 pmLondon
Feb 11
YXU9:25 amLondon
6h 24m
1 stop
IAD3:49 pmWashington, D.C. Dulles Intl
$616
Find similar

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
Feb 4
IAD12:40 pmWashington, D.C. Dulles Intl
8h 40m
2 stops
YXU9:20 pmLondon
Feb 11
YXU9:25 amLondon
6h 24m
1 stop
IAD3:49 pmWashington, D.C. Dulles Intl
$701
Find similar
United Airlines
Feb 4
IAD12:40 pmWashington, D.C. Dulles Intl
8h 40m
2 stops
YXU9:20 pmLondon
Feb 11
YXU9:25 amLondon
6h 24m
1 stop
IAD3:49 pmWashington, D.C. Dulles Intl
$712
Find similar
United Airlines
Feb 4
IAD12:40 pmWashington, D.C. Dulles Intl
8h 40m
2 stops
YXU9:20 pmLondon
Feb 11
YXU9:25 amLondon
8h 10m
2 stops
IAD5:35 pmWashington, D.C. Dulles Intl
$716
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 December 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

Tue 4/21

4:30 pm-9:18 pm

1 stop4h 48m

London

Fri 4/24

9:25 am-3:39 pm

1 stop6h 14m

$605

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Tue 4/21

4:30 pm-9:18 pm

1 stop4h 48m

London

Fri 4/24

9:25 am-7:40 pm

2 stops10h 15m

$614

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Tue 4/21

9:55 am-5:03 pm

2 stops7h 08m

London

Fri 4/24

9:25 am-7:40 pm

2 stops10h 15m

$622

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Mon 1/12

4:30 pm-9:20 pm

1 stop4h 50m

London

Mon 1/19

9:50 am-3:46 pm

1 stop5h 56m

$670

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Mon 1/12

9:45 am-5:05 pm

2 stops7h 20m

London

Mon 1/19

9:50 am-3:46 pm

1 stop5h 56m

$678

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Wed 2/4

12:40 pm-9:20 pm

2 stops8h 40m

London

Wed 2/11

9:25 am-3:49 pm

1 stop6h 24m

$701

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Wed 2/4

9:45 am-5:05 pm

2 stops7h 20m

London

Wed 2/11

9:25 am-4:13 pm

2 stops6h 48m

$705

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Wed 2/4

12:40 pm-9:20 pm

2 stops8h 40m

London

Wed 2/11

9:25 am-5:35 pm

2 stops8h 10m

$716

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Mon 1/12

9:45 am-5:05 pm

2 stops7h 20m

London

Mon 1/19

9:50 am-8:54 pm

2 stops11h 04m

$717

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Wed 2/4

11:40 am-6:35 am

3 stops18h 55m

London

Wed 2/11

8:10 pm-5:14 pm

3 stops21h 04m

$886

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 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

Fastest flight time

4h 05m

Direct flights

None
The fastest flight from Washington, D.C. Dulles Intl Airport to London, Ontario takes 4h 05m
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 05m.

  • 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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