Find flights
Deals
When to book
FAQs

Cheap flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from C$ 459

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 15/9. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — LHR
19 Jul — 26 Jul1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to London Heathrow are usually found in November or October, booked 63 days in advance, depart on a Wednesday or Monday and return on a Tuesday

Cheap flight deals from Dulles Intl to Heathrow

Enter your travel dates to find the best prices.

Cheapest flights from Dulles Intl to Heathrow
Explore the most affordable flight options available from Dulles Intl to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 19 June 2026.

Fri 21/88:30 p.m.
IAD
-
LHR
1 stop10h 25m
Icelandair
Mon 24/89:25 p.m.
LHR
-
IAD
1 stop26h 55m
Icelandair
Deal found 19/6C$ 1,192
Fri 18/98:20 p.m.
IAD
-
LHR
2 stops17h 10m
Scandinavian Airlines
Tue 22/97:50 p.m.
LHR
-
IAD
2 stops26h 10m
Scandinavian Airlines
Deal found 18/6C$ 1,195
Mon 24/812:29 p.m.
IAD
-
LHR
2 stops16h 06m
Scandinavian Airlines
Fri 28/810:20 a.m.
LHR
-
IAD
1 stop11h 40m
Scandinavian Airlines
Deal found 19/6C$ 1,196
Mon 10/810:15 p.m.
IAD
-
LHR
Nonstop7h 25m
Multiple Airlines
Wed 19/86:50 a.m.
LHR
-
IAD
1 stop11h 40m
Multiple Airlines
Deal found 18/6C$ 1,199
Wed 19/86:30 p.m.
IAD
-
LHR
Nonstop7h 25m
United Airlines
Tue 25/86:50 a.m.
LHR
-
IAD
1 stop12h 30m
United Airlines
Deal found 19/6C$ 1,200
Sun 4/1010:55 p.m.
IAD
-
LHR
Nonstop7h 25m
Delta
Thu 22/109:55 a.m.
LHR
-
IAD
1 stop10h 40m
Delta
Deal found 19/6C$ 1,202
Mon 3/810:15 p.m.
IAD
-
LHR
Nonstop7h 25m
United Airlines
Tue 18/812:10 p.m.
LHR
-
IAD
1 stop33h 35m
United Airlines
Deal found 18/6C$ 1,203
Thu 10/98:20 p.m.
IAD
-
LHR
2 stops15h 05m
Scandinavian Airlines
Mon 14/910:20 a.m.
LHR
-
IAD
1 stop11h 40m
Scandinavian Airlines
Deal found 18/6C$ 1,204
Tue 28/79:45 a.m.
IAD
-
LHR
1 stop19h 15m
United Airlines
Wed 19/86:50 a.m.
LHR
-
IAD
1 stop11h 40m
United Airlines
Deal found 18/6C$ 1,206
Sat 25/710:29 p.m.
IAD
-
LHR
1 stop17h 51m
United Airlines
Wed 19/86:50 a.m.
LHR
-
IAD
1 stop11h 40m
United Airlines
Deal found 18/6C$ 1,207
Wed 14/107:59 p.m.
IAD
-
LHR
1 stop11h 06m
Delta
Tue 3/118:40 a.m.
LHR
-
IAD
1 stop12h 05m
Delta
Deal found 18/6C$ 1,209
Mon 7/910:55 p.m.
IAD
-
LHR
Nonstop7h 25m
Multiple Airlines
Wed 16/96:15 a.m.
LHR
-
IAD
1 stop14h 50m
Multiple Airlines
Deal found 19/6C$ 1,211

Find flight deals from Dulles Intl to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to Heathrow (LHR). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 19 June 2026.

Round-trip from

C$ 1,192

One-way from

C$ 459

Popular in

June

Cheapest in

November

Average price

C$ 1,826
Icelandair
  • Icelandair
  • 21/8-24/8
  • 2 total stops
  • 37h 20m total
  • Washington, D.C. to London
Search Deals
British Airways
  • British Airways
  • 17/11
  • Nonstop
  • 7h 10m total
  • Washington, D.C. to London
Search Deals
Highest demand for flights based on searches. 21% potential increase in price (C$ 454 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (C$ 87 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Dulles Intl to Heathrow 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, Cheapflights users made 629,999 searches. Data last updated 19 June 2026.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 23/8

7:19 p.m.-12:05 p.m.

1 stop11h 46m

London Heathrow

Fri 23/10

5:55 p.m.-9:05 p.m.

Nonstop8h 10m

C$ 1,248

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Thu 3/9

6:30 p.m.-6:55 a.m.

Nonstop7h 25m

London Heathrow

Wed 9/9

6:50 a.m.-1:30 p.m.

1 stop11h 40m

C$ 1,271

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 16/8

10:15 p.m.-10:40 a.m.

Nonstop7h 25m

London Heathrow

Sat 29/8

9:00 a.m.-7:25 p.m.

1 stop15h 25m

C$ 1,272

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 3/8

10:55 p.m.-11:20 a.m.

Nonstop7h 25m

London Heathrow

Thu 13/8

9:55 a.m.-3:35 p.m.

1 stop10h 40m

C$ 1,274

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Thu 20/8

5:40 p.m.-9:00 a.m.

1 stop10h 20m

London Heathrow

Tue 1/9

9:55 a.m.-3:35 p.m.

1 stop10h 40m

C$ 1,283
Quickest round-trip

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 22/11

6:20 p.m.-6:30 a.m.

Nonstop7h 10m

London Heathrow

Fri 27/11

4:25 p.m.-7:55 p.m.

Nonstop8h 30m

C$ 1,285

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Thu 17/9

6:35 p.m.-6:55 a.m.

Nonstop7h 20m

London Heathrow

Mon 21/9

11:05 a.m.-2:20 p.m.

1 stop32h 15m

C$ 1,288

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Thu 15/10

10:05 p.m.-10:40 a.m.

Nonstop7h 35m

London Heathrow

Fri 4/12

4:20 p.m.-8:15 p.m.

Nonstop8h 55m

C$ 1,312

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 11/9

6:35 p.m.-6:55 a.m.

Nonstop7h 20m

London Heathrow

Thu 17/9

4:40 p.m.-8:15 p.m.

Nonstop8h 35m

C$ 1,313

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 15/8

6:30 p.m.-6:55 a.m.

Nonstop7h 25m

London Heathrow

Sat 22/8

6:50 a.m.-1:30 p.m.

1 stop11h 40m

C$ 1,343

Flights are sorted by cheapest round-trip flights first.

Deals found on 17/6

Showing 1-10 of 24 resultsSorted by cheapest first
1
2
3

Best time to book a flight from Dulles Intl to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Dulles Intl 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 Washington, D.C. Dulles Intl Airport to London Heathrow Airport

How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

The price you pay for your flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport may vary depending on when you book. For the best chance of a lower fare, look to book 62 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, November is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport (average of C$ 974). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of C$ 1,826). 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.

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

Find hourly flight availability from Dulles Intl to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 19 June 2026.

When flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost to fly round-trip from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Related info for your journey

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

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

    There are many flights that can get you from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in 7h 25m. Fly via United Airlines or Delta to get the fastest option. There are 5897 km between Washington, D.C. Dulles Intl Airport and London Heathrow Airport. This flight may include one or multiple stops.

  • What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

    No one likes to see their flight delayed. When booking a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport consider choosing American Airlines (78%), British Airways (78%) or Aer Lingus (77%) as they are the most reliable in getting you off to your destination on time.

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

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

  • How can I find direct flights from Dulles Intl to Heathrow?

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

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

    Yes. Cheapflights offers flight deals from Dulles Intl to Heathrow 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 Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

    Currently, November is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport (average of C$ 974). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of C$ 1,826). 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.

See more FAQs

Travelling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Gatwick
Romford
Twickenham
Ilford
Bromley
Sutton
Hounslow
Slough
Marlow
Cobham
Leamington Spa
Northampton
Watford
Luton
High Wycombe
Stratford-upon-Avon
Moreton-in-Marsh

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Dulles Intl to Heathrow?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Heathrow from Dulles Intl today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from Dulles Intl to Heathrow?

Millions of users choose and trust Cheapflights to book the best flight deals from Dulles Intl to Heathrow for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Dulles Intl to Heathrow with no change fees?

Yes, we can. To see specific flights from Dulles Intl to Heathrow with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Dulles Intl to Heathrow become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.