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Cheap flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport from £412

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 7/6. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — IAD
4 Jun — 11 Jun1
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 75 days in advance, depart on a Wednesday or Thursday 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 5 May 2026.

Sun 19/717:05
LHR
-
IAD
Nonstop8h 15m
British Airways
Tue 28/722:25
IAD
-
LHR
Nonstop7h 25m
British Airways
Deal found 4/5£430
Thu 24/913:05
LHR
-
IAD
1 stop11h 15m
Icelandair
Sat 10/1020:30
IAD
-
LHR
1 stop10h 25m
Icelandair
Deal found 30/4£432
Fri 21/812:35
LHR
-
IAD
Nonstop8h 20m
British Airways
Sat 12/922:25
IAD
-
LHR
Nonstop7h 25m
British Airways
Deal found 3/5£434
Tue 6/1013:05
LHR
-
IAD
1 stop11h 15m
Icelandair
Tue 13/1020:30
IAD
-
LHR
1 stop10h 25m
Icelandair
Deal found 30/4£435
Tue 8/913:05
LHR
-
IAD
1 stop14h 10m
Icelandair
Sat 12/920:30
IAD
-
LHR
1 stop10h 25m
Icelandair
Deal found 4/5£436
Thu 18/614:00
LHR
-
IAD
Nonstop8h 30m
British Airways
Mon 22/619:20
IAD
-
LHR
Nonstop7h 25m
British Airways
Deal found 4/5£437
Thu 2/711:45
LHR
-
IAD
1 stop11h 47m
Delta
Mon 13/710:21
IAD
-
LHR
1 stop15h 04m
Delta
Deal found 4/5£438
Mon 1/621:25
LHR
-
IAD
1 stop26h 55m
Icelandair
Wed 30/923:20
IAD
-
LHR
1 stop16h 00m
Icelandair
Deal found 2/5£440
Tue 6/1013:05
LHR
-
IAD
1 stop11h 15m
Icelandair
Tue 20/1020:30
IAD
-
LHR
1 stop10h 25m
Icelandair
Deal found 1/5£440

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 5 May 2026.

Round-trip from

£430

One-way from

£412

Popular in

July

Cheapest in

February

Average price

£562

Good round-trip deal

£534 or less

Good one-way deal

£613 or less
British Airways
  • British Airways
  • 19/7-28/7
  • Nonstop
  • 15h 40m total
  • London to Washington, D.C.
Search Deals
7/6
  • 7/6
  • 2 total stops
  • 27h 10m total
  • London to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£48 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£6 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 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 5 May 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 11/6

09:55-15:35

1 stop10h 40m

Washington, D.C. Dulles Intl

Mon 15/6

22:55-11:20

Nonstop7h 25m

£531

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 10/6

09:55-15:35

1 stop10h 40m

Washington, D.C. Dulles Intl

Mon 20/7

22:55-11:20

Nonstop7h 25m

£534

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 29/10

13:00-20:54

1 stop11h 54m

Washington, D.C. Dulles Intl

Thu 5/11

13:05-05:55

1 stop11h 50m

£536

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 3/8

17:05-20:20

Nonstop8h 15m

Washington, D.C. Dulles Intl

Mon 10/8

17:45-06:20

Nonstop7h 35m

£552

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sat 13/6

06:15-16:05

1 stop14h 50m

Washington, D.C. Dulles Intl

Wed 9/9

12:30-06:20

1 stop12h 50m

£555
Fastest return journey

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 26/6

17:55-20:55

Nonstop8h 00m

Washington, D.C. Dulles Intl

Mon 29/6

22:55-11:20

Nonstop7h 25m

£562

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 17/7

12:35-15:55

Nonstop8h 20m

Washington, D.C. Dulles Intl

Wed 12/8

13:23-06:55

1 stop12h 32m

£583

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 25/6

17:55-20:55

Nonstop8h 00m

Washington, D.C. Dulles Intl

Fri 17/7

22:55-11:20

Nonstop7h 25m

£585

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 5/6

09:55-15:35

1 stop10h 40m

Washington, D.C. Dulles Intl

Sun 7/6

12:29-06:45

1 stop13h 16m

£595

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 12/6

06:30-15:35

1 stop14h 05m

Washington, D.C. Dulles Intl

Tue 30/6

19:14-12:10

1 stop11h 56m

£601

Flights are sorted by cheapest return flights first.

Deals found on 1/5

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

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 74 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 £461). Flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £620). 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 5 May 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 5 May 2026.
Read reviews from past customers who have flown with United Airlines,Virgin Atlantic, 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.
United Airlines
7.4
Good
9,683 reviews
Check prices

Comfort

7.3

Crew

8.1

Overall

7.4

Boarding

7.7

Entertainment

7.1

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
United Airlines
7.4
Good
9,683 reviews
United Airlines
7.4
Good
9,683 reviews
Check prices

Comfort

7.3

Crew

8.1

Overall

7.4

Boarding

7.7

Entertainment

7.1

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
Virgin Atlantic
7.4
Good
688 reviews
United Airlines
7.4
Good
9,683 reviews
Check prices

Comfort

7.3

Crew

8.1

Overall

7.4

Boarding

7.7

Entertainment

7.1

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
Aer Lingus
7.3
Good
1,541 reviews
United Airlines
7.4
Good
9,683 reviews
Check prices

Comfort

7.3

Crew

8.1

Overall

7.4

Boarding

7.7

Entertainment

7.1

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
Lufthansa
6.8
Okay
7,972 reviews
United Airlines
7.4
Good
9,683 reviews
Check prices

Comfort

7.3

Crew

8.1

Overall

7.4

Boarding

7.7

Entertainment

7.1

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
British Airways
6.7
Okay
7,945 reviews
United Airlines
7.4
Good
9,683 reviews
Check prices

Comfort

7.3

Crew

8.1

Overall

7.4

Boarding

7.7

Entertainment

7.1

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.

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 KLM, United Airlines, and British Airways fly from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in about 8h 15m. The time it takes to get you to your destination can typically vary by up to 3h 39m. 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 £292, Delta will fly you from London Heathrow Airport to Washington, D.C. Dulles Intl Airport and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from TAP AIR PORTUGAL and Icelandair - these airlines can fly you to your destination from £328 and £329, respectively. Delta is currently priced 46% 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 £344 on TAP AIR PORTUGAL. Other airlines that offer cheap prices include Aer Lingus from £382 and United Airlines from £421 one-way.

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

    Consider Air Canada (86%), Austrian Airlines (86%) or Copa Airlines (86%) 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 £936 for a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is £463 while the most popular route, (London Heathrow - Washington, D.C. Dulles Intl) is currently priced at £430.

  • 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 £461). Flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £620). 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
Hanover
Oxon Hill
Gaithersburg
Woodbridge
Arlington
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 5 May 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 5 May 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest£292Average£532FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
TAP AIR PORTUGALCheapest£328Average£401FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
IcelandairCheapest£329Average£422FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£360Average£563FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
LufthansaCheapest£399Average£572FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Virgin AtlanticCheapest£404Average£545FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£407Average£557FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Scandinavian AirlinesCheapest£413Average£589FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Austrian AirlinesCheapest£413Average£567FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
FinnairCheapest£413Average£634FlexibilityNo cancel feeOn-time76%
Search Finnair 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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