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Cheap flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport from £376

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 12/2. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — IAD
4 Dec — 11 Dec1
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 September or February, booked 65 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Cheap 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 November 2025.

Round-trip from

£414

One-way from

£376

Popular in

July

Cheapest in

September

Average price

£575

Good round-trip deal

£528 or less

Good one-way deal

£526 or less
TAP AIR PORTUGAL
  • TAP AIR PORTUGAL
  • 2/4-9/4
  • 2 total stops
  • 28h 25m total
  • London to Washington, D.C.
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12/2
  • 12/2
  • 2 total stops
  • 15h 40m total
  • London to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£61 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£10 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
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Price to beat on a round-trip flight from London Heathrow to Washington, D.C. Dulles Intl.
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Price to beat on a one-way flight from London Heathrow to Washington, D.C. Dulles Intl.
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Find 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 November 2025.

Thu 25/1206:40LHR - IAD
1 stop15h 35mScandinavian Airlines
Sat 31/120:30IAD - LHR
1 stop17h 00mScandinavian Airlines
Deal found 2/11£438
Mon 8/1206:00LHR - IAD
1 stop14h 15mTAP AIR PORTUGAL
Thu 11/1217:30IAD - LHR
1 stop14h 10mTAP AIR PORTUGAL
Deal found 2/11£446
Sun 7/1208:15LHR - IAD
1 stop17h 45mTAP AIR PORTUGAL
Thu 11/1217:30IAD - LHR
1 stop12h 55mTAP AIR PORTUGAL
Deal found 1/11£448
Thu 27/1106:40LHR - IAD
1 stop15h 35mScandinavian Airlines
Mon 1/1220:30IAD - LHR
1 stop17h 00mScandinavian Airlines
Deal found 1/11£448
Mon 8/1206:00LHR - IAD
1 stop14h 15mTAP AIR PORTUGAL
Fri 12/1222:30IAD - LHR
1 stop14h 00mTAP AIR PORTUGAL
Deal found 1/11£451
Mon 15/1216:50LHR - IAD
Nonstop8h 40mVirgin Atlantic
Wed 31/1222:20IAD - LHR
Nonstop7h 30mVirgin Atlantic
Deal found 3/11£453
Thu 27/1106:40LHR - IAD
1 stop15h 35mScandinavian Airlines
Thu 4/1220:30IAD - LHR
1 stop14h 30mScandinavian Airlines
Deal found 2/11£454
Wed 26/1118:40LHR - IAD
1 stop27h 35mScandinavian Airlines
Sat 6/1220:30IAD - LHR
1 stop14h 30mScandinavian Airlines
Deal found 2/11£455
Tue 25/1117:30LHR - IAD
2 stops52h 45mScandinavian Airlines
Mon 1/1220:30IAD - LHR
1 stop17h 00mScandinavian Airlines
Deal found 1/11£456
Wed 24/1217:00LHR - IAD
1 stop29h 15mScandinavian Airlines
Mon 5/120:30IAD - LHR
1 stop14h 30mScandinavian Airlines
Deal found 3/11£457

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 November 2025.
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

Heathrow

Fly to

Dulles Intl

Route

Depart

Return

Price

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 15/12

10:00-16:05

1 stop11h 05m

Washington, D.C. Dulles Intl

Wed 31/12

22:20-10:50

Nonstop7h 30m

£486

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 13/11

12:15-18:30

1 stop11h 15m

Washington, D.C. Dulles Intl

Sun 16/11

19:40-10:50

1 stop10h 10m

£492

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 19/3

12:10-16:35

Nonstop8h 25m

Washington, D.C. Dulles Intl

Wed 1/4

17:40-06:20

Nonstop7h 40m

£496

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 18/12

06:30-16:05

1 stop14h 35m

Washington, D.C. Dulles Intl

Tue 23/12

06:00-08:45

1 stop21h 45m

£498

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 19/3

06:40-18:15

1 stop15h 35m

Washington, D.C. Dulles Intl

Wed 1/4

20:20-18:50

2 stops17h 30m

£502

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 25/12

08:40-16:05

1 stop12h 25m

Washington, D.C. Dulles Intl

Wed 31/12

18:05-09:00

1 stop9h 55m

£502

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 5/12

16:50-20:30

Nonstop8h 40m

Washington, D.C. Dulles Intl

Thu 11/12

22:20-10:50

Nonstop7h 30m

£507

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 4/12

16:50-20:30

Nonstop8h 40m

Washington, D.C. Dulles Intl

Wed 10/12

22:20-10:50

Nonstop7h 30m

£508

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 6/2

16:25-19:55

Nonstop8h 30m

Washington, D.C. Dulles Intl

Fri 27/2

18:20-06:30

Nonstop7h 10m

£518

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 24/11

09:55-16:49

1 stop11h 54m

Washington, D.C. Dulles Intl

Thu 11/12

16:40-09:15

1 stop11h 35m

£522

Flights are sorted by cheapest return flights first.

Deals found on 2/11

Showing 1-10 of 22 results
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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?

Use this chart to determine the optimal time to book a return flight from Heathrow to Dulles Intl. Price data was last updated on 31 October 2025.

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 65 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, September is the cheapest month in which you can book a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport (average of £387). Flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £547). 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 November 2025.

A simple way to save on the total cost of your ticket is to fly from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in the evening. If you’re flexible enough to do this you can expect to save up to 17% on your trip compared to booking a flight in the afternoon.

What is the cheapest day to fly from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?

Use this chart to determine the cheapest time to fly return from Heathrow to Dulles Intl. Price data was last updated on 2 November 2025.

Travellers seeking maximum savings on their London Heathrow Airport to Washington, D.C. Dulles Intl Airport flight should consider departing on Monday evenings when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 November 2025.
Read reviews from past customers who have flown with Virgin Atlantic, Aer Lingus, andIcelandair 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
671 reviews
Check prices

Crew

8.1

Overall

7.5

Boarding

7.7

Comfort

7.3

Food

6.9

Entertainment

7.5

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
Virgin Atlantic
7.5
Good
671 reviews
Virgin Atlantic
7.5
Good
671 reviews
Check prices

Crew

8.1

Overall

7.5

Boarding

7.7

Comfort

7.3

Food

6.9

Entertainment

7.5

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
Aer Lingus
7.2
Good
1,365 reviews
Virgin Atlantic
7.5
Good
671 reviews
Check prices

Crew

8.1

Overall

7.5

Boarding

7.7

Comfort

7.3

Food

6.9

Entertainment

7.5

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
Icelandair
7.1
Good
568 reviews
Virgin Atlantic
7.5
Good
671 reviews
Check prices

Crew

8.1

Overall

7.5

Boarding

7.7

Comfort

7.3

Food

6.9

Entertainment

7.5

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
Lufthansa
6.8
Okay
7,547 reviews
Virgin Atlantic
7.5
Good
671 reviews
Check prices

Crew

8.1

Overall

7.5

Boarding

7.7

Comfort

7.3

Food

6.9

Entertainment

7.5

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
British Airways
6.7
Okay
7,494 reviews
Virgin Atlantic
7.5
Good
671 reviews
Check prices

Crew

8.1

Overall

7.5

Boarding

7.7

Comfort

7.3

Food

6.9

Entertainment

7.5

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!

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 Icelandair, British Airways, and Delta fly from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in about 8h 25m. The time it takes to get you to your destination can typically vary by up to 6h 10m. 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 £193, 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 £361 and £382, respectively. Delta is currently priced 67% 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 £391 on Aer Lingus. Other airlines that offer cheap prices include United Airlines from £431 and Austrian Airlines from £433 one-way.

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

    Consider KLM (95%), Air France (92%) or Delta (92%) 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 £1,527 for a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is £417 while the most popular route, (London Heathrow - Washington, D.C. Dulles Intl) is currently priced at £395.

  • Where are the most common stopover locations when flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?

    Flights departing from London Heathrow Airport and landing in Washington, D.C. Dulles Intl Airport stopover in Dublin most frequently.

  • What are some popular things to do or see while on a stopover in Dublin?

    Dublin travellers tend to visit Bord Gáis Energy Theatre, 3Olympia Theatre, and Dublin Castle more than anywhere else. Bord Gáis Energy Theatre, 3Olympia Theatre, and Dublin Castle are located about 5.7 mi, 5.7 mi, and 5.8 mi, respectively from Dublin. Those on a stopover in Dublin in need of a car hire can book one at Dublin for about £16.

  • Where are the least popular stopover locations for London Heathrow Airport to Washington, D.C. Dulles Intl Airport flights?

    Of the flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport that have stopovers, the fewest flights stop in Reykjavik.

  • 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, September is the cheapest month in which you can book a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport (average of £387). Flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £547). 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
Woodbridge
Arlington
Alexandria
College Park

Browse thousands of different options on Cheapflights for your next trip

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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 November 2025.
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 November 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest£193Average£528FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
TAP AIR PORTUGALCheapest£361Average£499FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
IcelandairCheapest£382Average£516FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£394Average£590FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
United AirlinesCheapest£401Average£580FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
FinnairCheapest£431Average£644FlexibilityNo cancel feeOn-time76%
Search Finnair flights
LufthansaCheapest£436Average£612FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Scandinavian AirlinesCheapest£441Average£585FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Virgin AtlanticCheapest£443Average£602FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
KLMCheapest£447Average£607FlexibilityNo cancel feeOn-time75%
Search KLM 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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