In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 2.6 in.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

What is the cheapest time of day to fly from YXU to IAD?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London, Ontario to Washington, D.C. Dulles Intl Airport as you normally would.

Most accurate provider : When it comes to deals on London, Ontario-Washington, D.C. Dulles Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on London, Ontario-Washington, D.C. Dulles Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from London, Ontario-Washington, D.C. Dulles Intl Airport flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on London, Ontario-Washington, D.C. Dulles Intl Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London, Ontario-Washington, D.C. Dulles Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

What airport do you fly from for flights from London to Washington, D.C. Dulles Intl?

Located just 5.3 mi from the city center, London is the airport most travelers will use when flying to Washington, D.C. Dulles Intl from London. Booking flights from London (YXU) to Washington, D.C. Dulles Intl should be relatively easy as there are 0 daily outbound flights to Washington, D.C. Dulles Intl from 0 different airlines.

Can I find deals for flights from London to Dulles Intl that include hotel bookings?

Yes. In addition to deals on London to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from London to Dulles Intl?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Dulles Intl.

Can I find deals for business class flights from London to Dulles Intl?

Yes. Cheapflights offers flight deals from London to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$281+ Flights from London, ON to Washington, D.C. Dulles Intl Airport

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Cheap flight deals from London to Dulles Intl

Cheapest flights from London to Dulles Intl
Explore the most affordable flight options available from London to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 26, 2026.

Mon 3/309:25 am

YXU

IAD

1 stop6h 09m

Air Canada

Tue 3/314:30 pm

IAD

YXU

1 stop4h 48m

Air Canada

Deal found 1/24

$512

Best flights from London to Dulles Intl
Discover carefully curated flight deals from London to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated January 26, 2026.

Mon 3/309:25 am

YXU

IAD

1 stop6h 09m

Air Canada

Tue 3/314:30 pm

IAD

YXU

1 stop4h 48m

Air Canada

Deal found 1/24

$512

One-way flights from London to Dulles Intl
Search for one-way flight options from London to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated January 26, 2026.

Tue 6/303:30 pm

YXU

IAD

1 stop4h 54m

Air Canada

Deal found 1/26

$281

Tue 6/306:00 am

YXU

IAD

2 stops13h 14m

United Airlines

Deal found 1/26

$317

Tue 6/306:00 am

YXU

IAD

3 stops32h 17m

Multiple Airlines

Deal found 1/26

$796

Find flight deals from London to Dulles Intl

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$510 (Air Canada)
One-way from	$281 (Air Canada)

Provider with most accurate pricing for London-Washington, D.C. Dulles Intl flight deals.

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One-way flight from London to Washington, D.C. Dulles Intl

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Use the filters below to find and compare flights from London to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonWashington, D.C.

YXU - IAD

YXUIAD

London

Mon 3/30

9:25 am-3:34 pm

1 stop6h 09m

Washington, D.C. Dulles Intl

Tue 3/31

4:30 pm-9:18 pm

1 stop4h 48m

$512

LondonWashington, D.C.

YXU - IAD

YXUIAD

London

Tue 6/30

3:30 pm-8:24 pm

1 stop4h 54m

$281

LondonWashington, D.C.

YXU - IAD

YXUIAD

London

Tue 6/30

6:00 am-7:14 pm

2 stops13h 14m

$317

LondonWashington, D.C.

YXU - IAD

YXUIAD

London

Tue 6/30

6:00 am-2:17 pm

3 stops32h 17m

$796

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/26

Most accurate provider: When it comes to deals on London, Ontario-Washington, D.C. Dulles Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on London, Ontario-Washington, D.C. Dulles Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from London, Ontario-Washington, D.C. Dulles Intl Airport flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on London, Ontario-Washington, D.C. Dulles Intl Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London, Ontario-Washington, D.C. Dulles Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from London to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from London with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from London to Washington, D.C. Dulles Intl Airport

What is the cheapest month to book a flight from London, Ontario to Washington, D.C. Dulles Intl Airport?

Currently, February is the cheapest month in which you can book a flight from London, Ontario to Washington, D.C. Dulles Intl Airport (average of $131). Flying from London, Ontario to Washington, D.C. Dulles Intl Airport in December is currently the most expensive (average of $218). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Related info for your journey

What airport do you fly from for flights from London to Washington, D.C. Dulles Intl?
Located just 5.3 mi from the city center, London is the airport most travelers will use when flying to Washington, D.C. Dulles Intl from London. Booking flights from London (YXU) to Washington, D.C. Dulles Intl should be relatively easy as there are 0 daily outbound flights to Washington, D.C. Dulles Intl from 0 different airlines.
How long is the flight from London, Ontario to Washington, D.C. Dulles Intl Airport?
There are many flights that can get you from London, Ontario to Washington, D.C. Dulles Intl Airport in 6h 09m. Fly via Air Canada to get the fastest option. Airlines will cover a distance of 341 mi.
Can I find deals for flights from London to Dulles Intl that include hotel bookings?
Yes. In addition to deals on London to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from London to Dulles Intl?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Dulles Intl.
Can I find deals for business class flights from London to Dulles Intl?
Yes. Cheapflights offers flight deals from London to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from London, Ontario to Washington, D.C. Dulles Intl Airport?
Currently, February is the cheapest month in which you can book a flight from London, Ontario to Washington, D.C. Dulles Intl Airport (average of $131). Flying from London, Ontario to Washington, D.C. Dulles Intl Airport in December is currently the most expensive (average of $218). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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Herndon

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$281+ Cheap flights from London, ON (YXU) to Dulles Intl (IAD)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/30. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from London to Dulles Intl with Cheapflights

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2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from London to Dulles Intl

Cheapest flights from London to Dulles IntlExplore the most affordable flight options available from London to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 26, 2026.

Explore the most affordable flight options available from London to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 26, 2026.

Find flight deals from London to Dulles Intl

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Cheapflights Fare Finder

Use the filters below to find and compare flights from London to Washington, D.C. Dulles Intl Airport that are best for you.

Best time to book a flight from London to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from London with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from London to Washington, D.C. Dulles Intl Airport

What is the cheapest month to book a flight from London, Ontario to Washington, D.C. Dulles Intl Airport?

Related info for your journey

Find useful and relevant information for your journey from London to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly from for flights from London to Washington, D.C. Dulles Intl?

How long is the flight from London, Ontario to Washington, D.C. Dulles Intl Airport?

Can I find deals for flights from London to Dulles Intl that include hotel bookings?

How can I find direct flights from London to Dulles Intl?

Can I find deals for business class flights from London to Dulles Intl?

What is the cheapest month to book a flight from London, Ontario to Washington, D.C. Dulles Intl Airport?

Traveling to a place near Washington, D.C. Dulles Intl Airport?

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Cheapest flights from London to Dulles Intl
Explore the most affordable flight options available from London to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 26, 2026.