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Cheap flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport from £327

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 27/8. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — IAD
3 Aug — 10 Aug1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London Heathrow to Washington, D.C. Dulles Intl are usually found in February or September, booked 82 days in advance, depart on a Thursday or Wednesday and return on a Tuesday

Cheap flight deals from Heathrow to Dulles Intl

Enter your travel dates to find the best prices.

Cheapest flights from Heathrow to Dulles Intl
Explore the most affordable flight options available from Heathrow to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 4 July 2026.

Mon 17/813:05
LHR
-
IAD
1 stop11h 15m
Icelandair
Mon 24/820:30
IAD
-
LHR
1 stop10h 25m
Icelandair
Deal found 29/6£439
Tue 14/721:25
LHR
-
IAD
1 stop29h 50m
Icelandair
Fri 28/823:20
IAD
-
LHR
1 stop16h 00m
Icelandair
Deal found 29/6£440
Mon 24/821:25
LHR
-
IAD
1 stop26h 55m
Icelandair
Sun 6/920:30
IAD
-
LHR
1 stop18h 50m
Icelandair
Deal found 30/6£441
Tue 25/821:25
LHR
-
IAD
1 stop26h 55m
Icelandair
Thu 10/920:30
IAD
-
LHR
1 stop18h 50m
Icelandair
Deal found 30/6£445
Wed 16/906:00
LHR
-
IAD
1 stop14h 10m
TAP AIR PORTUGAL
Mon 21/922:35
IAD
-
LHR
1 stop18h 25m
TAP AIR PORTUGAL
Deal found 29/6£445
Fri 7/808:00
LHR
-
IAD
1 stop13h 30m
United Airlines
Sat 22/813:10
IAD
-
LHR
1 stop14h 20m
United Airlines
Deal found 1/7£446
Thu 15/1011:20
LHR
-
IAD
1 stop14h 15m
TAP AIR PORTUGAL
Sun 18/1022:35
IAD
-
LHR
1 stop19h 20m
TAP AIR PORTUGAL
Deal found 30/6£447
Thu 24/906:00
LHR
-
IAD
1 stop14h 10m
TAP AIR PORTUGAL
Tue 29/922:35
IAD
-
LHR
1 stop19h 20m
TAP AIR PORTUGAL
Deal found 2/7£448
Mon 17/813:05
LHR
-
IAD
1 stop11h 15m
Icelandair
Thu 27/820:30
IAD
-
LHR
1 stop10h 25m
Icelandair
Deal found 30/6£449
Mon 17/813:05
LHR
-
IAD
1 stop11h 15m
Icelandair
Sun 30/820:30
IAD
-
LHR
1 stop10h 25m
Icelandair
Deal found 1/7£450
Sat 17/1018:45
LHR
-
IAD
1 stop25h 25m
TAP AIR PORTUGAL
Fri 23/1022:50
IAD
-
LHR
1 stop15h 00m
TAP AIR PORTUGAL
Deal found 2/7£451

Find flight deals from Heathrow to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to Dulles Intl (IAD). 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 4 July 2026.

Round-trip from

£439

One-way from

£327

Popular in

August

Cheapest in

February

Average price

£597

Good round-trip deal

£505 or less

Good one-way deal

£487 or less
Icelandair
  • Icelandair
  • 17/8-24/8
  • 2 total stops
  • 21h 40m total
  • London to Washington, D.C.
Search Deals
British Airways
  • British Airways
  • 27/8
  • 1 total stop
  • 13h 05m total
  • London to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 2% potential increase in price (£11 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 0% potential price decrease (£4 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2026
Search Deals
Price to beat on a round-trip flight from London Heathrow to Washington, D.C. Dulles Intl.
Search Deals
Price to beat on a one-way flight from London Heathrow to Washington, D.C. Dulles Intl.
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Heathrow to Dulles Intl 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 858,174 searches. Data last updated 4 July 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 29/10

09:30-16:55

1 stop11h 25m

Washington, D.C. Dulles Intl

Thu 5/11

06:10-20:35

1 stop9h 25m

£514

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 27/8

09:05-14:35

1 stop34h 30m

Washington, D.C. Dulles Intl

Fri 11/9

18:35-06:55

Nonstop7h 20m

£515

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sun 23/8

06:50-14:20

1 stop12h 30m

Washington, D.C. Dulles Intl

Mon 7/9

12:35-05:55

1 stop12h 20m

£518

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 20/8

20:05-15:30

1 stop24h 25m

Washington, D.C. Dulles Intl

Wed 26/8

20:20-17:50

1 stop16h 30m

£520

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 15/10

21:05-17:00

2 stops24h 55m

Washington, D.C. Dulles Intl

Thu 5/11

20:30-18:50

2 stops17h 20m

£534

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 10/9

16:40-20:15

Nonstop8h 35m

Washington, D.C. Dulles Intl

Wed 16/9

18:35-06:55

Nonstop7h 20m

£535

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Tue 15/12

16:25-19:55

Nonstop8h 30m

Washington, D.C. Dulles Intl

Wed 6/1

18:20-06:30

Nonstop7h 10m

£537
Fastest return journey

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sat 10/10

17:55-21:05

Nonstop8h 10m

Washington, D.C. Dulles Intl

Tue 13/10

22:55-11:20

Nonstop7h 25m

£539

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 22/7

18:40-16:45

1 stop27h 05m

Washington, D.C. Dulles Intl

Wed 12/8

20:20-16:25

1 stop15h 05m

£543

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 18/9

07:05-17:00

2 stops14h 55m

Washington, D.C. Dulles Intl

Mon 21/9

20:20-16:25

2 stops15h 05m

£564

Flights are sorted by cheapest return flights first.

Deals found on 29/6

Showing 1-10 of 22 resultsSorted by cheapest first
1
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Best time to book a flight from Heathrow to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Heathrow with our price prediction graph.
Estimated return 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 Heathrow Airport to Washington, D.C. Dulles Intl Airport

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

To ensure you get the cheapest price possible for a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport, you should look to book at least 81 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport (average of £470). Flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in August is currently the most expensive (average of £598). 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 LHR to IAD?

Find hourly flight availability from Heathrow to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 4 July 2026.

When flying from London Heathrow Airport to Washington, D.C. Dulles Intl 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 for a return flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?

Reviews of airlines servicing Dulles Intl

Get insights into the airlines that provide service to Dulles Intl. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Dulles Intl. Reviews last updated 4 July 2026.
Read reviews from past customers who have flown with Virgin Atlantic,United Airlines, andAer Lingus from London Heathrow Airport to Washington, D.C. Dulles Intl Airport. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Virgin Atlantic
7.5
Good
691 reviews
Check prices

Food

6.9

Overall

7.5

Crew

8.1

Entertainment

7.5

Comfort

7.3

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
Virgin Atlantic
7.5
Good
691 reviews
Virgin Atlantic
7.5
Good
691 reviews
Check prices

Food

6.9

Overall

7.5

Crew

8.1

Entertainment

7.5

Comfort

7.3

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
United Airlines
7.4
Good
9,933 reviews
Virgin Atlantic
7.5
Good
691 reviews
Check prices

Food

6.9

Overall

7.5

Crew

8.1

Entertainment

7.5

Comfort

7.3

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
Aer Lingus
7.3
Good
1,642 reviews
Virgin Atlantic
7.5
Good
691 reviews
Check prices

Food

6.9

Overall

7.5

Crew

8.1

Entertainment

7.5

Comfort

7.3

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
Lufthansa
6.8
Okay
8,109 reviews
Virgin Atlantic
7.5
Good
691 reviews
Check prices

Food

6.9

Overall

7.5

Crew

8.1

Entertainment

7.5

Comfort

7.3

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
British Airways
6.7
Okay
8,095 reviews
Virgin Atlantic
7.5
Good
691 reviews
Check prices

Food

6.9

Overall

7.5

Crew

8.1

Entertainment

7.5

Comfort

7.3

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.

Related info for your journey

Find useful and relevant information for your journey from Heathrow to Dulles Intl. 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 London Heathrow Airport to Washington, D.C. Dulles Intl Airport?

    Airlines like United Airlines, Austrian Airlines, and SWISS fly from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in about 11h 25m. The time it takes to get you to your destination can typically vary by up to 23h 05m. There are 3664 mi between London Heathrow Airport and Washington, D.C. Dulles Intl Airport. Both multi-stop and direct flights can be found to your destination and back.

  • What are the cheapest airlines flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport round-trip?

    Currently priced at £325, Icelandair will fly you from London Heathrow Airport to Washington, D.C. Dulles Intl Airport and back. In addition to Icelandair, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from TAP AIR PORTUGAL and Aer Lingus - these airlines can fly you to your destination from £351 and £365, respectively. Icelandair is currently priced 40% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from London Heathrow Airport to Washington, D.C. Dulles Intl Airport one-way?

    One-way options have recently been found by users for as low as £346 on British Airways. Other airlines that offer cheap prices include Aer Lingus from £355 and TAP AIR PORTUGAL from £371 one-way.

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

    Consider Air Canada (88%), Austrian Airlines (88%) or Copa Airlines (88%) when booking your flight. These represent the most reliable airlines when flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport.

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

    On average you can expect to pay £1,576 for a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is £430 while the most popular route, (London Heathrow - Washington, D.C. Dulles Intl) is currently priced at £406.

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

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

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

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

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

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

    Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport (average of £470). Flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in August is currently the most expensive (average of £598). 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 Washington, D.C. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Silver Spring
Oxon Hill
Gaithersburg
Hanover
Woodbridge
Alexandria
Sterling

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Fly from Heathrow to Dulles Intl on these airlines

Choose from the following airlines for your flight from Heathrow to Dulles Intl. Flights are based on user searches made on Cheapflights and were last updated on 4 July 2026.
Virgin Atlantic flights from London Heathrow to Washington, D.C. Dulles Intl
British Airways flights from London Heathrow to Washington, D.C. Dulles Intl
Lufthansa flights from London Heathrow to Washington, D.C. Dulles Intl

Top 10 airlines flying from Heathrow to Dulles Intl

Discover the top 10 airlines that operate flights from Heathrow to Dulles Intl. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 4 July 2026.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£325Average£396FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
TAP AIR PORTUGALCheapest£351Average£415FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Aer LingusCheapest£365Average£563FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
LufthansaCheapest£404Average£554FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Virgin AtlanticCheapest£405Average£550FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£410Average£567FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Scandinavian AirlinesCheapest£411Average£532FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Austrian AirlinesCheapest£418Average£565FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
FinnairCheapest£420Average£626FlexibilityNo cancel feeOn-time76%
Search Finnair flights
DeltaCheapest£424Average£571FlexibilityNo cancel feeOn-timeN/A
Search Delta flights

Fly with Cheapflights

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

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

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Heathrow to Dulles Intl. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Heathrow to Dulles Intl.

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

Need flexible booking options for your flight to Dulles Intl from Heathrow? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

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

Yes! Start tracking prices for Heathrow to Dulles Intl flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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