Latest deals
Insights
When to book
FAQs
Price Alerts

Cheap flights from Washington, D.C. Dulles Intl Airport to London from $558

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 9/7. 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
1 adult, Economy, 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.
Multiple Airlines Logo
7:00 pm - 5:20 am
IAD
-
YXU
10h 20m
1 stop
Multiple Airlines Logo
6:10 am - 6:20 am
YXU
-
IAD
24h 10m
2 stops
$558Multiple Airlines
Mon, Sep 7 - Sun, Sep 13
Multiple Airlines Logo
7:00 pm - 9:19 am
IAD
-
YXU
14h 19m
2 stops
Multiple Airlines Logo
3:30 pm - 8:24 pm
YXU
-
IAD
4h 54m
1 stop
$574Multiple Airlines
Mon, Aug 31 - Sun, Sep 6
Multiple Airlines Logo
7:00 pm - 5:20 am
IAD
-
YXU
10h 20m
1 stop
Multiple Airlines Logo
10:05 am - 3:24 pm
YXU
-
IAD
5h 19m
1 stop
$582Multiple Airlines
Mon, Aug 31 - Sun, Sep 6
Multiple Airlines Logo
7:00 pm - 5:20 am
IAD
-
YXU
10h 20m
1 stop
Multiple Airlines Logo
6:10 am - 5:18 pm
YXU
-
IAD
35h 08m
2 stops
$601Multiple Airlines
Mon, Aug 31 - Wed, Sep 30
Multiple Airlines Logo
7:00 pm - 5:20 am
IAD
-
YXU
10h 20m
1 stop
Multiple Airlines Logo
6:10 am - 6:20 am
YXU
-
IAD
24h 10m
2 stops
$609Multiple Airlines
Mon, Sep 7 - Sun, Sep 13
Multiple Airlines Logo
7:00 pm - 5:20 am
IAD
-
YXU
10h 20m
1 stop
Multiple Airlines Logo
6:10 am - 5:18 pm
YXU
-
IAD
35h 08m
2 stops
$644Multiple Airlines
Mon, Sep 7 - Sun, Sep 13
Multiple Airlines Logo
7:00 pm - 5:20 am
IAD
-
YXU
10h 20m
1 stop
Multiple Airlines Logo
6:10 am - 3:10 pm
YXU
-
IAD
33h 00m
3 stops
$723Multiple Airlines
Mon, Sep 7 - Sun, Sep 13
Air Canada Logo
9:55 am - 2:50 pm
IAD
-
YXU
4h 55m
1 stop
Air Canada Logo
10:05 am - 3:25 pm
YXU
-
IAD
5h 20m
1 stop
$743Air Canada
Sat, Sep 19 - Wed, Sep 23
Air Canada Logo
4:20 pm - 9:40 pm
IAD
-
YXU
5h 20m
1 stop
Air Canada Logo
3:30 pm - 8:25 pm
YXU
-
IAD
4h 55m
1 stop
$744Air Canada
Mon, Sep 7 - Sun, Sep 13
Air Canada Logo
9:55 am - 2:50 pm
IAD
-
YXU
4h 55m
1 stop
Air Canada Logo
10:05 am - 3:25 pm
YXU
-
IAD
5h 20m
1 stop
$744Air Canada
Sat, Sep 19 - Wed, Sep 23

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

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
Sep 19
IAD9:55 amWashington, D.C. Dulles Intl
4h 55m
1 stop
YXU2:50 pmLondon
Sep 23
YXU10:05 amLondon
5h 20m
1 stop
IAD3:25 pmWashington, D.C. Dulles Intl
$743
Air Canada
Sep 19
IAD9:55 amWashington, D.C. Dulles Intl
4h 55m
1 stop
YXU2:50 pmLondon
Sep 23
YXU10:05 amLondon
5h 20m
1 stop
IAD3:25 pmWashington, D.C. Dulles Intl
$744
Air Canada
Sep 19
IAD9:55 amWashington, D.C. Dulles Intl
4h 55m
1 stop
YXU2:50 pmLondon
Sep 23
YXU10:05 amLondon
8h 55m
2 stops
IAD7:00 pmWashington, D.C. Dulles Intl
$752

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
Aug 31
IAD1:10 pmWashington, D.C. Dulles Intl
8h 30m
2 stops
YXU9:40 pmLondon
Sep 6
YXU10:05 amLondon
6h 30m
2 stops
IAD4:35 pmWashington, D.C. Dulles Intl
$836
United Airlines
Aug 31
IAD1:10 pmWashington, D.C. Dulles Intl
8h 30m
2 stops
YXU9:40 pmLondon
Sep 30
YXU10:05 amLondon
7h 39m
2 stops
IAD5:44 pmWashington, D.C. Dulles Intl
$904
United Airlines
Aug 21
IAD12:35 pmWashington, D.C. Dulles Intl
9h 05m
2 stops
YXU9:40 pmLondon
Aug 31
YXU3:30 pmLondon
4h 54m
1 stop
IAD8:24 pmWashington, D.C. Dulles Intl
$963

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 August 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

Cheapest round-trip

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Mon 9/7

7:00 pm-5:20 am

1 stop10h 20m

London

Sun 9/13

6:10 am-6:20 am

2 stops24h 10m

$558

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Mon 8/31

7:00 pm-9:19 am

2 stops14h 19m

London

Sun 9/6

3:30 pm-8:24 pm

1 stop4h 54m

$574

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Mon 8/31

7:00 pm-5:20 am

1 stop10h 20m

London

Sun 9/6

10:05 am-3:24 pm

1 stop5h 19m

$582

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Mon 8/31

7:00 pm-5:20 am

1 stop10h 20m

London

Wed 9/30

6:10 am-5:18 pm

2 stops35h 08m

$601

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Mon 9/7

7:00 pm-5:20 am

1 stop10h 20m

London

Sun 9/13

6:10 am-6:20 am

2 stops24h 10m

$609

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Mon 9/7

7:00 pm-5:20 am

1 stop10h 20m

London

Sun 9/13

6:10 am-5:18 pm

2 stops35h 08m

$644

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Mon 9/7

7:00 pm-5:20 am

1 stop10h 20m

London

Sun 9/13

6:10 am-3:10 pm

3 stops33h 00m

$723
Quickest round-trip

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Sat 9/19

9:55 am-2:50 pm

1 stop4h 55m

London

Wed 9/23

10:05 am-3:25 pm

1 stop5h 20m

$743

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Mon 9/7

4:20 pm-9:40 pm

1 stop5h 20m

London

Sun 9/13

3:30 pm-8:25 pm

1 stop4h 55m

$744

Washington, D.C.London

IAD - YXU

IADYXU

Washington, D.C. Dulles Intl

Sat 9/19

9:55 am-2:50 pm

1 stop4h 55m

London

Wed 9/23

10:05 am-3:25 pm

1 stop5h 20m

$744

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

4h 55m

Direct flights

None
The fastest flight from Washington, D.C. Dulles Intl Airport to London, Ontario takes 4h 55m
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 4h 55m.

  • 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.

An easier way to manage your London, Ontario trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Thu 9/3
Thu 9/10
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Canada