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Cheap flights from Washington, D.C. Dulles Intl Airport to London from $568

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 6/26. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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
9:55 am - 2:57 pm
IAD
-
YXU
5h 02m
1 stop
Air Canada Logo
10:05 am - 4:12 pm
YXU
-
IAD
6h 07m
1 stop
$568Air Canada
Fri, Jun 26 - Sun, Jun 28
Air Canada Logo
4:00 pm - 9:40 pm
IAD
-
YXU
5h 40m
1 stop
Air Canada Logo
10:05 am - 3:25 pm
YXU
-
IAD
5h 20m
1 stop
$625Air Canada
Thu, Sep 24 - Sun, Sep 27
Air Canada Logo
9:55 am - 2:55 pm
IAD
-
YXU
5h 00m
1 stop
Air Canada Logo
5:40 am - 3:00 pm
YXU
-
IAD
9h 20m
2 stops
$633Air Canada
Thu, Sep 24 - Sun, Sep 27
Air Canada Logo
4:05 pm - 9:38 pm
IAD
-
YXU
5h 33m
1 stop
Air Canada Logo
9:30 am - 3:29 pm
YXU
-
IAD
5h 59m
1 stop
$655Air Canada
Wed, May 27 - Thu, May 28
Air Canada Logo
4:00 pm - 9:40 pm
IAD
-
YXU
5h 40m
1 stop
Air Canada Logo
3:30 pm - 8:25 pm
YXU
-
IAD
4h 55m
1 stop
$657Air Canada
Thu, Sep 24 - Sun, Sep 27
Air Canada Logo
4:05 pm - 9:38 pm
IAD
-
YXU
5h 33m
1 stop
Air Canada Logo
9:30 am - 6:58 pm
YXU
-
IAD
9h 28m
2 stops
$663Air Canada
Wed, May 27 - Thu, May 28
Air Canada Logo
4:00 pm - 9:40 pm
IAD
-
YXU
5h 40m
1 stop
Air Canada Logo
5:40 am - 3:00 pm
YXU
-
IAD
9h 20m
2 stops
$666Air Canada
Thu, Sep 24 - Sun, Sep 27
Air Canada Logo
9:45 am - 5:33 pm
IAD
-
YXU
7h 48m
2 stops
Air Canada Logo
9:30 am - 6:58 pm
YXU
-
IAD
9h 28m
2 stops
$672Air Canada
Wed, May 27 - Thu, May 28
Air Canada Logo
4:05 pm - 9:38 pm
IAD
-
YXU
5h 33m
1 stop
Air Canada Logo
9:30 am - 3:29 pm
YXU
-
IAD
5h 59m
1 stop
$687Air Canada
Wed, May 27 - Thu, May 28
Air Canada Logo
9:45 am - 5:33 pm
IAD
-
YXU
7h 48m
2 stops
Air Canada Logo
9:30 am - 3:29 pm
YXU
-
IAD
5h 59m
1 stop
$695Air Canada
Wed, May 27 - Thu, May 28

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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
Jun 15
IAD4:05 pmWashington, D.C. Dulles Intl
5h 33m
1 stop
YXU9:38 pmLondon
Jun 22
YXU10:05 amLondon
5h 19m
1 stop
IAD3:24 pmWashington, D.C. Dulles Intl
$762
United Airlines
May 14
IAD10:34 pmWashington, D.C. Dulles Intl
13h 09m
2 stops
YXU11:43 amLondon
May 17
YXU9:30 amLondon
5h 59m
1 stop
IAD3:29 pmWashington, D.C. Dulles Intl
$772
United Airlines
Jun 14
IAD4:05 pmWashington, D.C. Dulles Intl
5h 33m
1 stop
YXU9:38 pmLondon
Jun 30
YXU3:30 pmLondon
7h 49m
2 stops
IAD11:19 pmWashington, D.C. Dulles Intl
$777

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

Our best WestJet deals on Washington, D.C. Dulles Intl Airport to London, Ontario flight tickets
WestJet
May 29
IAD7:00 pmWashington, D.C. Dulles Intl
21h 45m
1 stop
YXU4:45 pmLondon
May 31
YXU5:55 pmLondon
24h 15m
1 stop
IAD6:10 pmWashington, D.C. Dulles Intl
$1,054
WestJet
Jun 16
IAD5:29 pmWashington, D.C. Dulles Intl
35h 51m
2 stops
YXU5:20 amLondon
Jun 23
YXU2:40 pmLondon
27h 19m
2 stops
IAD5:59 pmWashington, D.C. Dulles Intl
$1,070
WestJet
Jul 17
IAD6:00 amWashington, D.C. Dulles Intl
23h 20m
2 stops
YXU5:20 amLondon
Jul 21
YXU2:40 pmLondon
8h 40m
2 stops
IAD11:20 pmWashington, D.C. Dulles Intl
$1,214

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 May 3, 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

Cheapest round-trip

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Fri 6/26

9:55 am-2:57 pm

1 stop5h 02m

London

Sun 6/28

10:05 am-4:12 pm

1 stop6h 07m

$568

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Thu 9/24

4:00 pm-9:40 pm

1 stop5h 40m

London

Sun 9/27

10:05 am-3:25 pm

1 stop5h 20m

$625

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Thu 9/24

9:55 am-2:55 pm

1 stop5h 00m

London

Sun 9/27

5:40 am-3:00 pm

2 stops9h 20m

$633

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Wed 5/27

4:05 pm-9:38 pm

1 stop5h 33m

London

Thu 5/28

9:30 am-3:29 pm

1 stop5h 59m

$655
Quickest round-trip

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Thu 9/24

4:00 pm-9:40 pm

1 stop5h 40m

London

Sun 9/27

3:30 pm-8:25 pm

1 stop4h 55m

$657

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Wed 5/27

4:05 pm-9:38 pm

1 stop5h 33m

London

Thu 5/28

9:30 am-6:58 pm

2 stops9h 28m

$663

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Thu 9/24

4:00 pm-9:40 pm

1 stop5h 40m

London

Sun 9/27

5:40 am-3:00 pm

2 stops9h 20m

$666

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Wed 5/27

9:45 am-5:33 pm

2 stops7h 48m

London

Thu 5/28

9:30 am-6:58 pm

2 stops9h 28m

$672

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Wed 5/27

4:05 pm-9:38 pm

1 stop5h 33m

London

Thu 5/28

9:30 am-3:29 pm

1 stop5h 59m

$687

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Wed 5/27

9:45 am-5:33 pm

2 stops7h 48m

London

Thu 5/28

9:30 am-3:29 pm

1 stop5h 59m

$695

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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 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 60% of people opting to fly with this airline when traveling to London, Ontario. Keep in mind that there are 4 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

5h 00m

Direct flights

None
The fastest flight from Washington, D.C. Dulles Intl Airport to London, Ontario takes 5h 00m
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

Frequently asked questions about flying from Washington, D.C. Dulles Intl Airport to London, Ontario

  • 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 5h 00m.

  • 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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