Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport from £390

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 12/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — IAD
16 Jul — 23 Jul1
1 adult

Cheapflights Tip: The best prices from London Heathrow to Washington, D.C. Dulles Intl are usually found in February or March, booked 68 days in advance, depart on a Wednesday or Saturday 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 11 July 2025.

Round-trip from

£476

One-way from

£390

Popular in

August

Cheapest in

February

Average price

£731

Good round-trip deal

£538 or less

Good one-way deal

£589 or less
Scandinavian Airlines
  • Scandinavian Airlines
  • 17/11-29/11
  • 4 total stops
  • 30h 30m total
  • London to Washington, D.C.
Search Deals
12/10
  • 12/10
  • 3 total stops
  • 40h 00m total
  • London to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (£68 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£12 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2025
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

Find flight deals from Heathrow to Dulles Intl

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 11 July 2025.

Mon 17/1106:40LHR - IAD
2 stops15h 35mScandinavian Airlines
Sat 29/1120:30IAD - LHR
2 stops14h 55mScandinavian Airlines
Deal found 11/7£476
Thu 4/908:40LHR - IAD
1 stop11h 55mKLM
Wed 10/917:25IAD - LHR
1 stop12h 20mKLM
Deal found 9/7£479
Sat 13/1219:55LHR - IAD
1 stop30h 05mTAP AIR PORTUGAL
Sat 27/1217:30IAD - LHR
1 stop14h 10mTAP AIR PORTUGAL
Deal found 10/7£481
Mon 17/1107:50LHR - IAD
1 stop12h 45mAer Lingus
Wed 19/1121:00IAD - LHR
1 stop9h 25mAer Lingus
Deal found 9/7£482
Fri 12/908:40LHR - IAD
2 stops34h 45mSWISS
Fri 19/917:25IAD - LHR
2 stops23h 20mSWISS
Deal found 9/7£483
Sat 6/1213:25LHR - IAD
1 stop12h 34mAir Canada
Fri 19/1209:00IAD - LHR
1 stop16h 30mAir Canada
Deal found 10/7£488
Thu 21/808:30LHR - IAD
1 stop12h 20mLufthansa
Mon 25/822:20IAD - LHR
Nonstop7h 20mLufthansa
Deal found 9/7£490
Sat 6/917:00LHR - IAD
2 stops23h 34mFinnair
Mon 15/919:21IAD - LHR
2 stops29h 59mFinnair
Deal found 11/7£491
Wed 6/821:25LHR - IAD
1 stop29h 45mIcelandair
Tue 12/820:30IAD - LHR
1 stop10h 25mIcelandair
Deal found 9/7£494
Tue 14/1007:45LHR - IAD
1 stop11h 40mMultiple Airlines
Fri 7/1118:20IAD - LHR
Nonstop7h 20mMultiple Airlines
Deal found 10/7£496
Mon 18/806:50LHR - IAD
1 stop11h 40mUnited Airlines
Sun 24/818:35IAD - LHR
Nonstop7h 20mUnited Airlines
Deal found 10/7£499
Mon 27/1013:35LHR - IAD
Nonstop8h 45mVirgin Atlantic
Sat 8/1119:10IAD - LHR
Nonstop7h 30mVirgin Atlantic
Deal found 9/7£505

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 11 July 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 17/11

06:40-17:15

2 stops15h 35m

Washington, D.C. Dulles Intl

Sat 29/11

20:30-16:25

2 stops14h 55m

£476

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 4/9

08:40-15:35

1 stop11h 55m

Washington, D.C. Dulles Intl

Wed 10/9

17:25-10:45

1 stop12h 20m

£479

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sat 13/12

19:55-21:00

1 stop30h 05m

Washington, D.C. Dulles Intl

Sat 27/12

17:30-12:40

1 stop14h 10m

£481

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 17/11

07:50-15:35

1 stop12h 45m

Washington, D.C. Dulles Intl

Wed 19/11

21:00-11:25

1 stop9h 25m

£482

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 12/9

08:40-14:25

2 stops34h 45m

Washington, D.C. Dulles Intl

Fri 19/9

17:25-21:45

2 stops23h 20m

£483

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sat 6/12

13:25-20:59

1 stop12h 34m

Washington, D.C. Dulles Intl

Fri 19/12

09:00-06:30

1 stop16h 30m

£488

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 21/8

08:30-15:50

1 stop12h 20m

Washington, D.C. Dulles Intl

Mon 25/8

22:20-10:40

Nonstop7h 20m

£490

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sat 6/9

17:00-11:34

2 stops23h 34m

Washington, D.C. Dulles Intl

Mon 15/9

19:21-06:20

2 stops29h 59m

£491

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 6/8

21:25-22:10

1 stop29h 45m

Washington, D.C. Dulles Intl

Tue 12/8

20:30-11:55

1 stop10h 25m

£494

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Tue 14/10

07:45-14:25

1 stop11h 40m

Washington, D.C. Dulles Intl

Fri 17/10

22:25-10:40

Nonstop7h 15m

£496

Flights are sorted by cheapest return flights first.

Deals found on 10/7

Showing 1-10 of 16 results
1
2

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 27 June 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 68 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, January is the cheapest month in which you can book a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport (average of £599). Flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £947). 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 11 July 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 20% 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 6 July 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.

Weekly flight availability from London Heathrow Airport to Washington, D.C. Dulles Intl Airport

Explore weekly flight availability from Heathrow to Dulles Intl. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 11 July 2025.

The most flights from LHR to IAD are scheduled on a Wednesday (28 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (18 on average).

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 11 July 2025.
Read reviews from past customers who have flown with KLM, Finnair, andAir France 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.
KLM
7.8
Good
1,372 reviews
Check prices

Overall

7.8

Food

7.3

Crew

8.4

Entertainment

7.1

Boarding

7.8

Comfort

7.7

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
KLM
7.8
Good
1,372 reviews
KLM
7.8
Good
1,372 reviews
Check prices

Overall

7.8

Food

7.3

Crew

8.4

Entertainment

7.1

Boarding

7.8

Comfort

7.7

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
Finnair
7.6
Good
1,312 reviews
KLM
7.8
Good
1,372 reviews
Check prices

Overall

7.8

Food

7.3

Crew

8.4

Entertainment

7.1

Boarding

7.8

Comfort

7.7

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
Air France
7.5
Good
1,467 reviews
KLM
7.8
Good
1,372 reviews
Check prices

Overall

7.8

Food

7.3

Crew

8.4

Entertainment

7.1

Boarding

7.8

Comfort

7.7

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
SWISS
7.5
Good
1,655 reviews
KLM
7.8
Good
1,372 reviews
Check prices

Overall

7.8

Food

7.3

Crew

8.4

Entertainment

7.1

Boarding

7.8

Comfort

7.7

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
United Airlines
7.4
Good
8,848 reviews
KLM
7.8
Good
1,372 reviews
Check prices

Overall

7.8

Food

7.3

Crew

8.4

Entertainment

7.1

Boarding

7.8

Comfort

7.7

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

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.

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

    Currently priced at £476, Scandinavian Airlines will fly you from London Heathrow Airport to Washington, D.C. Dulles Intl Airport and back. In addition to Scandinavian Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from KLM and TAP AIR PORTUGAL - these airlines can fly you to your destination from £479 and £481, respectively. Scandinavian Airlines is currently priced 21% 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 £396 on TAP AIR PORTUGAL. Other airlines that offer cheap prices include Aer Lingus from £411 and Icelandair from £422 one-way.

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

    Consider Air Canada (76%), Austrian Airlines (76%) or Copa Airlines (76%) 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 £1,778 for a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is £431 while the most popular route, (London Heathrow - Washington, D.C. Dulles Intl) is currently priced at £343.

  • 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 Vicar Street more than anywhere else. Bord Gáis Energy Theatre, 3Olympia Theatre, and Vicar Street are located about 5.7 mi, 5.7 mi, and 5.9 mi, respectively from Dublin. Those on a stopover in Dublin in need of a car hire can book one at Dublin for about £19.

  • 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, January is the cheapest month in which you can book a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport (average of £599). Flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £947). 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
Silver Spring
Hanover
Oxon Hill
Arlington
Woodbridge
College Park
Laurel
Tysons

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 11 July 2025.
British Airways flights from London Heathrow to Washington, D.C. Dulles Intl
Virgin Atlantic 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 11 July 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest£186Average£531FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
PLAYCheapest£274Average£451FlexibilityNo cancel feeOn-timeN/A
Search PLAY flights
TAP AIR PORTUGALCheapest£365Average£547FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
IcelandairCheapest£377Average£500FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Scandinavian AirlinesCheapest£433Average£569FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
FinnairCheapest£433Average£607FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Air FranceCheapest£434Average£602FlexibilityNo cancel feeOn-time77%
Search Air France flights
LufthansaCheapest£442Average£636FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£446Average£729FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
British AirwaysCheapest£456Average£602FlexibilityNo cancel feeOn-time70%
Search British Airways 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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
©2025 Cheapflights