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Cheap flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from C$ 487

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 14/7. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — LHR
26 Feb — 5 Mar1
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 September, booked 45 days in advance, depart on a Wednesday or Tuesday 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 27 January 2026.

Tue 14/48:30 p.m.
IAD
-
LHR
1 stop10h 25m
Icelandair
Sun 10/59:25 p.m.
LHR
-
IAD
1 stop26h 55m
Icelandair
Deal found 25/1C$ 759
Wed 25/28:30 p.m.
IAD
-
LHR
2 stops17h 20m
Scandinavian Airlines
Tue 3/39:05 p.m.
LHR
-
IAD
2 stops25h 10m
Scandinavian Airlines
Deal found 26/1C$ 801
Mon 23/28:30 p.m.
IAD
-
LHR
2 stops17h 20m
Scandinavian Airlines
Tue 3/39:05 p.m.
LHR
-
IAD
2 stops25h 10m
Scandinavian Airlines
Deal found 27/1C$ 805
Wed 11/28:30 p.m.
IAD
-
LHR
2 stops18h 25m
Scandinavian Airlines
Thu 19/27:05 a.m.
LHR
-
IAD
2 stops15h 10m
Scandinavian Airlines
Deal found 26/1C$ 815
Thu 9/48:20 p.m.
IAD
-
LHR
1 stop17h 10m
Scandinavian Airlines
Tue 21/49:05 p.m.
LHR
-
IAD
2 stops24h 45m
Scandinavian Airlines
Deal found 26/1C$ 831
Sun 26/48:20 p.m.
IAD
-
LHR
2 stops17h 30m
Scandinavian Airlines
Sun 3/59:05 p.m.
LHR
-
IAD
2 stops24h 45m
Scandinavian Airlines
Deal found 26/1C$ 837
Wed 25/26:20 p.m.
IAD
-
LHR
Nonstop7h 20m
United Airlines
Wed 4/36:50 a.m.
LHR
-
IAD
1 stop12h 45m
United Airlines
Deal found 26/1C$ 842
Mon 16/311:15 p.m.
IAD
-
LHR
Nonstop7h 35m
United Airlines
Thu 26/39:00 a.m.
LHR
-
IAD
1 stop12h 40m
United Airlines
Deal found 26/1C$ 843
Fri 13/311:20 p.m.
IAD
-
LHR
Nonstop7h 20m
Delta
Tue 24/38:40 a.m.
LHR
-
IAD
1 stop12h 25m
Delta
Deal found 26/1C$ 845
Mon 16/210:15 p.m.
IAD
-
LHR
Nonstop7h 35m
United Airlines
Wed 25/26:50 a.m.
LHR
-
IAD
1 stop12h 45m
United Airlines
Deal found 27/1C$ 846

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 27 January 2026.

Round-trip from

C$ 759

One-way from

C$ 487

Popular in

June

Cheapest in

August

Average price

C$ 972

Good round-trip deal

C$ 1,096 or less

Good one-way deal

C$ 479 or less
Icelandair
  • Icelandair
  • 14/4-10/5
  • 2 total stops
  • 37h 20m total
  • Washington, D.C. to London
Search Deals
TAP AIR PORTUGAL
  • TAP AIR PORTUGAL
  • 14/7
  • 1 total stop
  • 12h 15m total
  • Washington, D.C. to London
Search Deals
Highest demand for flights based on searches. 14% potential increase in price (C$ 237 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 46 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 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.
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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 27 January 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

Dulles Intl

Fly to

Heathrow

Route

Depart

Return

Price

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 26/4

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

2 stops15h 05m

London Heathrow

Sun 3/5

6:40 a.m.-4:50 p.m.

2 stops15h 10m

C$ 841

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 6/3

10:20 p.m.-10:40 a.m.

Nonstop7h 20m

London Heathrow

Thu 12/3

8:40 a.m.-5:05 p.m.

1 stop12h 25m

C$ 848

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 26/4

6:25 p.m.-6:55 a.m.

Nonstop7h 30m

London Heathrow

Wed 6/5

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

1 stop12h 30m

C$ 864

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 7/2

8:30 p.m.-5:00 p.m.

2 stops15h 30m

London Heathrow

Wed 18/2

9:05 p.m.-5:15 p.m.

2 stops25h 10m

C$ 864

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 29/4

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

Nonstop7h 30m

London Heathrow

Tue 5/5

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

1 stop11h 40m

C$ 868

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 16/2

10:15 p.m.-10:50 a.m.

Nonstop7h 35m

London Heathrow

Wed 1/4

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

1 stop15h 25m

C$ 869

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 22/2

10:20 p.m.-10:40 a.m.

Nonstop7h 20m

London Heathrow

Sun 8/3

4:50 p.m.-9:30 p.m.

Nonstop8h 40m

C$ 882

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 18/3

1:19 p.m.-6:55 a.m.

1 stop13h 36m

London Heathrow

Sun 22/3

4:50 p.m.-9:30 p.m.

Nonstop8h 40m

C$ 889

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Thu 12/3

6:00 a.m.-8:35 p.m.

1 stop10h 35m

London Heathrow

Sat 21/3

4:20 p.m.-9:15 p.m.

Nonstop8h 55m

C$ 889

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 29/3

6:00 a.m.-8:40 p.m.

1 stop9h 40m

London Heathrow

Mon 6/4

11:05 a.m.-1:30 p.m.

1 stop31h 25m

C$ 889

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/1

Showing 1-10 of 23 results
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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 23 January 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 45 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$ 597). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of C$ 1,008). 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 27 January 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.

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 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 American Airlines (84%), Aer Lingus (84%) or Finnair (84%) 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$ 926, our data shows the cheapest flight currently is C$ 479. When looking at the most popular route, (Washington, D.C. Dulles Intl - London Heathrow), you can expect to pay C$ 1,136 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$ 597). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of C$ 1,008). 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
Sutton
Twickenham
Gatwick
Slough
Marlow
Cobham
Milton Keynes
Leamington Spa
Romford
Bedford
Watford
Luton
High Wycombe
Stratford-upon-Avon
Hounslow

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