IAD - LHR

£242 Find Cheap Flights from Washington Dulles Airport to London Heathrow Airport – Compare and Save

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Everything you should know

Cheapest return fare
£504
Typical prices: £493-£712
Multiple Airlines
Tue 20/10Tue 27/10
IAD - LHR • 2 stops
Cheapest direct flights
£524
Typical prices: £469-£721
Finnair
Mon 9/11Tue 24/11
IAD - LHR • Direct
Advice from real travellers
For comfort, BA premium economy adds legroom; Lufthansa Premium Economy adds a bag.
Virgin Economy Delight adds legroom and priority boarding; United Wi-Fi has messaging.
Expert advice
Expert advice
+1
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Expert advice
Expert advice
+1
Direct flights
You can fly direct with British Airways, United Airlines, and Virgin Atlantic. Average duration is 7h 28m
Direct flights
Direct flights
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+1
Direct flights
Direct flights
+1
Avoid delays
Most punctual • 87% on-time
Best time • Fewest delays
Insights
Insights
Insights
Insights
Top stopover airports
Cheapest • Avg £331 (return)
Shortest trip • 9h 44m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travellers who book at least 3 weeks in advance save around 14% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 23% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
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KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Heathrow!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights from Dulles Intl to Heathrow (IAD-LHR)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from Dulles Intl to Heathrow

Tue, 20 Oct - Tue, 27 Oct
Multiple Airlines Logo
20:30 - 16:00IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
14h 30m2 stops Reykjavik Keflavik Intl Kastrup Copenhagen
Multiple Airlines Logo
06:40 - 19:30LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
16h 50m2 stops Kastrup Copenhagen Reykjavik Keflavik Intl
£504Multiple Airlines
Wed, 30 Sep - Wed, 7 Oct
Aer Lingus Logo
17:15 - 09:05IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
10h 50m1 stop Dublin
Aer Lingus Logo
08:50 - 15:45LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
11h 55m1 stop Dublin
£504Aer Lingus
Wed, 9 Dec - Wed, 16 Dec
British Airways Logo
18:05 - 06:15IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
7h 10mdirect
British Airways Logo
07:35 - 16:20LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
13h 45m1 stop Madrid Barajas
£506British Airways
Tue, 8 Dec - Tue, 15 Dec
British Airways Logo
21:45 - 10:00IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
7h 15mdirect
British Airways Logo
07:30 - 16:20LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
13h 50m1 stop Madrid Barajas
£507British Airways
Sat, 24 Oct - Sat, 31 Oct
Icelandair Logo
20:40 - 11:50IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
10h 10m1 stop Reykjavik Keflavik Intl
Icelandair Logo
12:15 - 19:30LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
11h 15m1 stop Reykjavik Keflavik Intl
£511Icelandair
Sun, 25 Oct - Fri, 30 Oct
Icelandair Logo
20:40 - 10:50IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
10h 10m1 stop Reykjavik Keflavik Intl
Icelandair Logo
12:15 - 19:30LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
11h 15m1 stop Reykjavik Keflavik Intl
£511Icelandair
Sun, 20 Sep - Tue, 29 Sep
Virgin Atlantic Logo
22:05 - 10:40IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
7h 35mdirect
Virgin Atlantic Logo
09:55 - 15:35LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
10h 40m1 stop Amsterdam Schiphol
£520Virgin Atlantic
Fri, 6 Nov - Fri, 20 Nov
Virgin Atlantic Logo
19:30 - 07:55IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
7h 25mdirect
Virgin Atlantic Logo
08:40 - 15:55LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
12h 15m1 stop Amsterdam Schiphol
£523Virgin Atlantic
Tue, 27 Oct - Tue, 3 Nov
United Airlines Logo
19:20 - 06:40IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
7h 20mdirect
United Airlines Logo
09:00 - 17:00LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
13h 00m1 stop Zurich
£528United Airlines
Tue, 6 Oct - Tue, 13 Oct
United Airlines Logo
22:05 - 10:40IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
7h 35mdirect
United Airlines Logo
08:45 - 16:45LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
13h 00m1 stop Zurich
£528United Airlines
Booking Insights

KAYAK’s insights & trends for Dulles Intl to Heathrow flights

Get data-powered insights and trends into flights from Dulles Intl to Heathrow to help you find the cheapest flights, the best time to fly and much more.

How much is a return flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Flight prices are below average for this route right now.

Flights to London Heathrow Airport from Washington, D.C. Dulles Intl Airport usually cost between £522 and £800 in September.
The lowest price found in the past 5 days was £504 on Aer Lingus (28 Sept–2 Oct).

What’s the cheapest day of the week to fly from Washington Dulles Airport to London Heathrow Airport?

For Washington Dulles Airport to London Heathrow Airport, Monday is the cheapest day to fly on average and Saturday is the most expensive. Flying from London Heathrow Airport back to Washington Dulles Airport, the best deals are generally found on Friday, with Sunday being the most expensive.

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

The cheapest month for flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport is February, where tickets cost £512 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is £963 and £812 respectively.

Can I save money by flying with a stopover from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Yes, flying with a stopover may cost you more time, but you can also save money on the route, with a 1 stop stopover the cheapest option at £771 on average.

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

To get a below average price on the flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport, you should book around 3 weeks before departure, which saves you about 14% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 25 weeks before departure.

Expert advice

Expert advice for your flight from Dulles Intl to Heathrow

 
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Blane Bachelor

Blane Bachelor

Expert on KLM

Blane Bachelor is a journalist and editor specialising in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favourite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history.

Gabriel Leigh

Gabriel Leigh

Expert on Finnair

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Jessica Macdonald

Jessica Macdonald

Expert on Lufthansa

Currently based in Scotland after living in South Africa and the United States, Jessica has been writing travel and aviation content for more than 10 years. She regularly contributes to Travel + Leisure and TripSavvy, and has had work published by Condé Nast Traveller and The Independent. She has travelled to more than 50 countries across six continents.

Duncan Madden

Duncan Madden

Expert on British Airways

Duncan is a freelance travel writer, copywriter and book author in constant search of travel stories and the perpetual sensation of being on holiday. He’s never happier than when on a dusty trail in search of empty waves or ducking under the piste tape in search of snowbound solitude. British born, living in Germany, but happiest heading for the horizon. His first book, Found in Translation, explores the etymologies and stories of country names around the world and is out now.

Stefanie Waldek

Stefanie Waldek

Expert on United Airlines and IAD

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or out at sea, likely en route to Antarctica or the Arctic.

Laura Ratliff

Laura Ratliff

Expert on Virgin Atlantic

Laura Ratliff is a New York-based writer and editor. She lives in downtown Brooklyn with her husband and their beloved dogs. Originally from Texas, she now considers New York City her home. She typically spends more than 200,000 miles on a plane each year and stays in plenty of hotels.

Kirstie Pickering

Kirstie Pickering

Expert on LHR

Aviation and business journalist Kirstie didn’t leave England until she was 18 years old, but has since travelled to over 20 countries including Japan, Canada, and Iceland. Her travel expertise lies in European city breaks, including how to find the best locally-owned hotels and restaurants and how to optimise the airport experience for your needs.

Good to know - Cheap tickets from Washington Dulles Airport to London Heathrow Airport

Low season

February

Cheapest flight

£242
Best time to beat the crowds (23% less expensive on average)
Most popular time to fly (22% more expensive on average)
Flight from Washington Dulles Airport to London Heathrow Airport

When to book flights from Dulles Intl to Heathrow

Are your dates flexible? Find out the best times to travel from Dulles Intl to Heathrow based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price

Flights from Dulles Intl to Heathrow: the best tips from KAYAK users' own experiences

Insights shared by verified travellers who flew the route from Dulles Intl to Heathrow 
DeeFlew with United AirlinesFeb 2025
For me the best route to LHR is the late night departure on UAL. The flight is often roughly 6.5 hours so I skip dinner, use an eye mask and earplugs and try to sleep.
EllenFlew with British AirwaysOct 2024
Do not check your bag if at all possible, especially if you have a connecting flight. Your bag will not make it.
CraigFlew with United AirlinesJun 2024
Get to beginning of boarding group early. Bring as little on board as possible due to small overhead bin space.

FAQs for booking Washington Dulles Airport to London Heathrow Airport flights

  • What accessibility services are there at Dulles Intl Airport?

    To cater to travelers with limited mobility and disabilities, Dulles Airport offers a wide range of accessibility services. These include elevators with Braille signage and self-voicing announcements, wheelchair access, a pet relief area for service or companion dogs, public restrooms with disability access, and assisted security screenings.

  • Are there nonstop flights from Dulles Intl to London-Heathrow Airport?

    Passengers wishing to fly from Washington, DC, to London can get nonstop flights from several airlines, including Lufthansa. Other nonstop flights are operated by multiple airlines, although the tickets come at a higher price. Most flights operated by American Airlines, Finnair, Icelandair, Delta Air Lines, and Virgin Atlantic have one- or two-stop flights. Depending on the airline, you may board your connecting flight in Keflavik, Dallas, Chicago, Helsinki, Boston, or Atlanta.

  • Are there airport hotels at London-Heathrow Airport?

    There are hotels located right within Heathrow Airport. They include the Hilton Garden Inn Airport Hotel, situated right next to Terminal 2 and a few minutes walk to Terminal 3. Alternatively, you can choose to stay at the Aerotel London Heathrow situated near Terminal 2 and 3. Other hotels within a comfortable walking distance include the Novotel London Heathrow Airport T1 T2 and T3, Ibis Styles London Heathrow Airport, Radisson Blu Edwardian Heathrow Hotel, and more.

  • How can I get from Heathrow Airport to the London city center?

    You can get from London-Heathrow Airport to the city center by train. You can board a train from Heathrow Central Station, located about 5min from terminals 2 and 3. You can get train tickets at the automated ticketing machines or booking office at the station. Trains from the airport arrive in the downtown area at Paddington Station after about 15min.

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

    In the last 5 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport was £242 for a one-way ticket and £504 for a return.

  • Which airports will I be using when flying from Washington Dulles Airport to London Heathrow Airport?

    On your way to London Heathrow Airport, you’ll fly out from Washington, D.C. Dulles Intl. You’ll be landing at London Heathrow.

  • Which airlines offer Wi-Fi service onboard planes from Washington Dulles Airport to London Heathrow Airport?

    Only KLM offers inflight Wi-Fi service on the Washington Dulles Airport to London Heathrow Airport flight route.

  • Which aircraft models fly most regularly from Washington Dulles Airport to London Heathrow Airport?

    The Boeing 777 is the aircraft model that flies most regularly on the Washington Dulles Airport to London Heathrow Airport flight route.

  • Which airline alliances offer flights from Washington Dulles Airport to London Heathrow Airport?

    Star Alliance, SkyTeam, and oneworld are the airline alliances operating flights between Washington Dulles Airport and London Heathrow Airport, with Star Alliance being the most commonly used for this route.

  • On which days can I fly direct from Washington Dulles Airport to London Heathrow Airport?

    There are direct flights from Washington Dulles Airport to London Heathrow Airport on a daily basis.

  • Which is the best airline for flights from Washington, D.C. to London, Delta or United Airlines?

    The two airlines most popular with KAYAK users for flights from Washington, D.C. to London are Delta and United Airlines. With an average price for the route of £956 and an overall rating of 7.8, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of £717 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Washington Dulles Airport to London Heathrow Airport?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Washington Dulles Airport to London Heathrow Airport.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington Dulles Airport to London Heathrow Airport?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London Heathrow Airport from Washington Dulles Airport is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Washington Dulles Airport to London Heathrow Airport?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to London Heathrow Airport with an airline and back to Washington Dulles Airport with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington Dulles Airport to London Heathrow Airport?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London Heathrow Airport from Washington Dulles Airport up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

  • Looking for a cheap flight from London Heathrow Airport to Washington Dulles Airport? 25% of our users found flights on this route for £341 or less one-way and £765 or less round-trip.
  • You can get to Dulles International Airport (IAD) from downtown Washington, DC, by car, bus, or train. If you require quick access to the airport, we recommend taking the train. A train ticket goes for about $11 and is a great way to avoid traffic.
  • Do you have a flight departure and want to return your rental car to one of the rental car companies at Dulles Intl Airport (IAD)? Follow the "Rental Car Return" signs at the airport, which lead to Autopilot Dr. Here, you'll find the rental car parking lots. Your rental company's shuttle bus should take you to the terminal.
  • If you feel like relaxing after touching down in London, you can access VIP services from one of the Heathrow (LHR) lounges. They include the Plaza Premium Lounge in Terminal 4, which charges around £27.45 ($38), the Club Aspire Lounge in Terminal 3, which charges approximately £27.45 ($38), and the Sky Team Lounge in Terminal 4, which charges around £31.39 ($43.50).
  • Pet lovers can travel with their pets from Washington, DC. The airport has pet relief areas outside the terminal building, right after security, and another one inside the concourses. If you plan to travel with your pet in the cabin or send him as baggage, we recommend that you contact your airline in advance.
  • Washington, DC/London air route is popular among business travelers. London Heathrow Airport is located about 14 miles from London city, offering easy access to business-centric points of interest like the Royal Horticultural Halls and the Excel Business Expo Center.

Prefer to fly direct from Washington Dulles Airport to London Heathrow Airport?

 
Find which airlines fly direct from Washington, D.C. Dulles Intl Airport to London Heathrow Airport, which days they fly and book direct flights.

Direct departures

Washington, D.C. Dulles Intl to London Heathrow

Monday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Tuesday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Wednesday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Thursday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Friday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Saturday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Sunday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

See more direct flights

Direct returns

London Heathrow to Washington, D.C. Dulles Intl

Monday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Tuesday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Wednesday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Thursday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Friday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Saturday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Sunday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

See more direct flights

More options for your flight from Dulles Intl to Heathrow

Complete your trip to Heathrow with a hotel stay or car hire