€608 Cheap Flights London to Washington (LHR-IAD)

View €608 flight on Tue, 26 Aug 2025Opens in a new window

Popular airlines from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD)

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Cheap flights from London to Washington (LHR-IAD)

Prices were available within the past 7 days and start at €608 for one-way flights and €429 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

TAP Portugal
Mon, 22 Sep - Mon, 29 Sep
LHR
London
IAD
Washington
€429 Return, found 3 hours ago
€429
Return
found 3 hours ago
Select TAP Portugal flight, departing Mon, 22 Sep from London to Washington, returning Mon, 29 Sep, priced at €429 found 3 hours ago
Icelandair
Sat, 1 Nov - Sat, 8 Nov
LHR
London
IAD
Washington
€495 Return, found 4 days ago
€495
Return
found 4 days ago
Select Icelandair flight, departing Sat, 1 Nov from London to Washington, returning Sat, 8 Nov, priced at €495 found 4 days ago
Swiss International Air Lines
Sun, 24 Aug - Tue, 9 Sep
LHR
London
IAD
Washington
€504 Return, found 6 hours ago
€504
Return
found 6 hours ago
Select Swiss International Air Lines flight, departing Sun, 24 Aug from London to Washington, returning Tue, 9 Sep, priced at €504 found 6 hours ago
Austrian Airlines
Mon, 22 Sep - Mon, 29 Sep
LHR
London
IAD
Washington
€504 Return, found 3 hours ago
€504
Return
found 3 hours ago
Select Austrian Airlines flight, departing Mon, 22 Sep from London to Washington, returning Mon, 29 Sep, priced at €504 found 3 hours ago
Lufthansa
Mon, 22 Sep - Mon, 29 Sep
LHR
London
IAD
Washington
€507 Return, found 3 hours ago
€507
Return
found 3 hours ago
Select Lufthansa flight, departing Mon, 22 Sep from London to Washington, returning Mon, 29 Sep, priced at €507 found 3 hours ago
Brussels Airlines
Mon, 22 Sep - Mon, 29 Sep
LHR
London
IAD
Washington
€508 Return, found 3 hours ago
€508
Return
found 3 hours ago
Select Brussels Airlines flight, departing Mon, 22 Sep from London to Washington, returning Mon, 29 Sep, priced at €508 found 3 hours ago
Scandinavian Airlines
Wed, 22 Oct - Wed, 29 Oct
LHR
London
IAD
Washington
€510 Return, found 18 hours ago
€510
Return
found 18 hours ago
Select Scandinavian Airlines flight, departing Wed, 22 Oct from London to Washington, returning Wed, 29 Oct, priced at €510 found 18 hours ago
British Airways
Mon, 22 Sep - Mon, 29 Sep
LHR
London
IAD
Washington
€529 Return, found 3 hours ago
€529
Return
found 3 hours ago
Select British Airways flight, departing Mon, 22 Sep from London to Washington, returning Mon, 29 Sep, priced at €529 found 3 hours ago
Virgin Atlantic
Mon, 22 Sep - Mon, 29 Sep
LHR
London
IAD
Washington
€529 Return, found 3 hours ago
€529
Return
found 3 hours ago
Select Virgin Atlantic flight, departing Mon, 22 Sep from London to Washington, returning Mon, 29 Sep, priced at €529 found 3 hours ago
Delta
Mon, 22 Sep - Mon, 29 Sep
LHR
London
IAD
Washington
€529 Return, found 3 hours ago
€529
Return
found 3 hours ago
Select Delta flight, departing Mon, 22 Sep from London to Washington, returning Mon, 29 Sep, priced at €529 found 3 hours ago

Find the cheapest month to fly from London (LHR) to Washington (IAD)

October is typically the cheapest month to fly

From €399 - €655 per traveller.

Graph displaying average flight prices per month

London to Washington route information
Origin airport
Heathrow
Destination airport
Washington Dulles Intl.
Airlines serving
Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, Icelandair, KLM, Lufthansa, Royal Air Maroc, Scandinavian Airlines, Swiss International Air Lines, TAP Portugal, Turkish Airlines, United, Virgin Atlantic
Return price
€429
Distance
5866 km
Average flight time
3 hours 15 mins

Perfect flights from London to Washington

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Our flexible Heathrow to Washington Dulles Intl. ticket options cater to your travel preferences, with incredible one-way fares from €608 and roundtrip prices from €429. Whether you're planning a short city break or a longer adventure, our dynamic pricing ensures that you find the best deals for your journey.
 
But the magic doesn't stop there. Expedia offers a range of partner services to enhance your trip. Rent a car at Washington Dulles Intl. and explore and its surrounding areas at your own pace. Discover hidden gems off the beaten path, and create unforgettable memories. We also provide a handpicked selection of accommodations, from charming bed and breakfasts to luxury hotels, ensuring that you have a comfortable and memorable stay.
 
Planning your next great adventure is a breeze with Expedia. Our user-friendly platform, unbeatable prices, and round-the-clock customer support are designed to make your travel experience seamless and stress-free. So, why wait? Book your to travel arrangements today and embark on the journey of a lifetime in Washington.

Frequently asked questions

How much is a flight from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD)?
Within the past 7 days on Expedia, for flights departing within the next year, the lowest price advertised for a round-trip journey between London Heathrow and Dulles Intl. Airport was €429. Fares this cheap don't wait forever, so make sure you book yours ASAP. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from LHR to Dulles Intl. Airport?
This can differ from airline to airline, as each has its own terms and conditions. Visit the Customer Service Portal, where you'll find easy instructions on how to cancel your flight online.
How do I find cheap flights from London Heathrow to IAD that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for Heathrow Airport to Dulles Intl. Airport flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Heathrow Airport (LHR) to Dulles Intl. Airport?
With around 5,900 kilometres separating Heathrow Airport and IAD, your flight will be a long one. Pack wisely to make your time on board comfortable. Simple things like warm clothes and some noise-cancelling headphones can make the biggest difference.
Which airlines fly direct from LHR to Dulles Intl. Airport?
United Airlines (UA) is a popular choice. It offers 60 flights between LHR and Washington Dulles Intl. Airport (IAD) each month. You could also have a look at the airfares with British Airways (BA). This airline operates 60 flights every month between Hounslow and Chantilly.
Are London Heathrow to IAD flight tickets cheaper when they're purchased at the last minute?
Flight prices fluctuate, so not always. While last-minute deals between LHR and Washington Dulles Intl. Airport (IAD) are of course possible, it's also a good idea to keep a close eye on prices well before you fly. In fact, some air carriers publish their prices up to a year ahead of the departure date. Expedia is constantly updating the best bargains around, so check back often and be ready to grab your seat when fare prices drop.

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