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Cheap flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from C$ 619

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 9/8. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — LHR
23 May — 30 May1
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 August or October, booked 63 days in advance, depart on a Monday or Wednesday 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 23 April 2026.

Wed 30/98:30 p.m.
IAD
-
LHR
1 stop10h 25m
Icelandair
Sun 11/101:05 p.m.
LHR
-
IAD
1 stop11h 15m
Icelandair
Deal found 19/4C$ 1,048
Fri 2/1011:20 p.m.
IAD
-
LHR
1 stop31h 35m
Icelandair
Fri 9/101:05 p.m.
LHR
-
IAD
1 stop11h 15m
Icelandair
Deal found 18/4C$ 1,049
Thu 24/98:30 p.m.
IAD
-
LHR
1 stop10h 25m
Icelandair
Mon 5/101:05 p.m.
LHR
-
IAD
1 stop11h 15m
Icelandair
Deal found 19/4C$ 1,057
Mon 5/108:20 p.m.
IAD
-
LHR
1 stop14h 40m
Scandinavian Airlines
Fri 16/1010:20 a.m.
LHR
-
IAD
1 stop11h 40m
Scandinavian Airlines
Deal found 19/4C$ 1,065
Tue 12/58:30 p.m.
IAD
-
LHR
1 stop10h 25m
Icelandair
Tue 19/51:05 p.m.
LHR
-
IAD
1 stop11h 15m
Icelandair
Deal found 22/4C$ 1,067
Tue 1/98:30 p.m.
IAD
-
LHR
1 stop10h 25m
Icelandair
Sat 12/91:05 p.m.
LHR
-
IAD
1 stop11h 15m
Icelandair
Deal found 19/4C$ 1,068
Mon 4/58:30 p.m.
IAD
-
LHR
1 stop10h 25m
Icelandair
Sat 16/59:25 p.m.
LHR
-
IAD
1 stop26h 55m
Icelandair
Deal found 19/4C$ 1,070
Fri 8/511:20 p.m.
IAD
-
LHR
1 stop31h 35m
Icelandair
Thu 14/59:25 p.m.
LHR
-
IAD
1 stop26h 55m
Icelandair
Deal found 18/4C$ 1,072
Mon 16/118:30 p.m.
IAD
-
LHR
1 stop17h 00m
Scandinavian Airlines
Fri 20/111:55 p.m.
LHR
-
IAD
2 stops33h 55m
Scandinavian Airlines
Deal found 19/4C$ 1,075
Sat 22/811:20 p.m.
IAD
-
LHR
1 stop31h 35m
Icelandair
Mon 31/89:25 p.m.
LHR
-
IAD
1 stop29h 50m
Icelandair
Deal found 18/4C$ 1,076
Wed 30/98:20 p.m.
IAD
-
LHR
2 stops15h 05m
Scandinavian Airlines
Sun 11/1010:20 a.m.
LHR
-
IAD
1 stop11h 40m
Scandinavian Airlines
Deal found 21/4C$ 1,090

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 23 April 2026.

Round-trip from

C$ 1,048

One-way from

C$ 619

Popular in

June

Cheapest in

August

Average price

C$ 1,065

Good round-trip deal

C$ 1,035 or less

Good one-way deal

C$ 605 or less
Icelandair
  • Icelandair
  • 30/9-11/10
  • 2 total stops
  • 21h 40m total
  • Washington, D.C. to London
Search Deals
TAP AIR PORTUGAL
  • TAP AIR PORTUGAL
  • 9/8
  • 1 total stop
  • 30h 45m total
  • Washington, D.C. to London
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (C$ 266 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 53 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals
Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to London Heathrow.
Search Deals
Price to beat on a one-way flight from Washington, D.C. Dulles Intl to London Heathrow.
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 23 April 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 27/9

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

Nonstop7h 20m

London Heathrow

Tue 6/10

6:50 a.m.-2:20 p.m.

1 stop12h 30m

C$ 1,164
Quickest round-trip

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 3/5

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

Nonstop7h 25m

London Heathrow

Tue 12/5

5:55 p.m.-8:55 p.m.

Nonstop8h 00m

C$ 1,205

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 26/8

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

Nonstop7h 25m

London Heathrow

Sun 30/8

8:40 a.m.-3:35 p.m.

1 stop11h 55m

C$ 1,232

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 6/5

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

Nonstop7h 25m

London Heathrow

Sun 10/5

6:30 a.m.-3:35 p.m.

1 stop14h 05m

C$ 1,233

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 6/5

8:15 a.m.-6:35 a.m.

2 stops17h 20m

London Heathrow

Sun 10/5

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

1 stop11h 40m

C$ 1,244

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Thu 20/8

8:20 p.m.-4:25 p.m.

2 stops15h 05m

London Heathrow

Wed 26/8

7:50 p.m.-7:16 p.m.

2 stops28h 26m

C$ 1,250

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Thu 1/10

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

Nonstop7h 25m

London Heathrow

Mon 5/10

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

1 stop10h 40m

C$ 1,302

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 22/8

8:20 p.m.-6:30 p.m.

1 stop17h 10m

London Heathrow

Mon 31/8

7:05 a.m.-5:00 p.m.

2 stops14h 55m

C$ 1,310

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Thu 14/5

9:50 p.m.-10:40 a.m.

Nonstop7h 50m

London Heathrow

Tue 19/5

6:50 a.m.-2:20 p.m.

1 stop12h 30m

C$ 1,317

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 25/7

5:45 p.m.-6:20 a.m.

Nonstop7h 35m

London Heathrow

Thu 13/8

5:05 p.m.-8:20 p.m.

Nonstop8h 15m

C$ 1,324

Flights are sorted by cheapest round-trip flights first.

Deals found on 22/4

Showing 1-10 of 21 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?

Use this chart to determine the optimal time to book a round-trip flight from Dulles Intl to Heathrow. Price data was last updated on 17 April 2026.

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 63 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, August 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$ 930). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of C$ 1,481). 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 23 April 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 20m. Fly via United Airlines, Delta, or KLM to get the fastest option. There are 5897 km between Washington, D.C. Dulles Intl Airport and London Heathrow Airport. All flights are typically direct.

  • 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 United Airlines (89%), Delta (85%) or Virgin Atlantic (85%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

    While on average a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport is generally C$ 820, our data shows the cheapest flight currently is C$ 605. When looking at the most popular route, (Washington, D.C. Dulles Intl - London Heathrow), you can expect to pay C$ 1,321 for that flight.

  • 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, August 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$ 930). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of C$ 1,481). 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
Twickenham
Bromley
Sutton
Slough
Marlow
Cobham
Leamington Spa
Watford
Luton
High Wycombe
Stratford-upon-Avon
Hounslow
Moreton-in-Marsh

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