€404 Cheap Flights London to Washington (LHR-IAD)

View €404 flight on Fri, 10 Oct 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 €404 for one-way flights and €449 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Icelandair
Sat, 14 Feb - Sun, 22 Feb
LHR
London
IAD
Washington
€449 Return, found 4 days ago
€449
Return
found 4 days ago
Select Icelandair flight, departing Sat, 14 Feb from London to Washington, returning Sun, 22 Feb, priced at €449 found 4 days ago
Aer Lingus
Wed, 8 Oct - Sun, 19 Oct
LHR
London
IAD
Washington
€473 Return, found 1 day ago
€473
Return
found 1 day ago
Select Aer Lingus flight, departing Wed, 8 Oct from London to Washington, returning Sun, 19 Oct, priced at €473 found 1 day ago
TAP Portugal
Fri, 10 Oct - Tue, 21 Oct
LHR
London
IAD
Washington
€474 Return, found 4 days ago
€474
Return
found 4 days ago
Select TAP Portugal flight, departing Fri, 10 Oct from London to Washington, returning Tue, 21 Oct, priced at €474 found 4 days ago
Austrian Airlines
Thu, 5 Mar - Sat, 14 Mar
LHR
London
IAD
Washington
€502 Return, found 5 days ago
€502
Return
found 5 days ago
Select Austrian Airlines flight, departing Thu, 5 Mar from London to Washington, returning Sat, 14 Mar, priced at €502 found 5 days ago
Lufthansa
Mon, 8 Sep - Sun, 14 Sep
LHR
London
IAD
Washington
€504 Return, found 4 days ago
€504
Return
found 4 days ago
Select Lufthansa flight, departing Mon, 8 Sep from London to Washington, returning Sun, 14 Sep, priced at €504 found 4 days ago
Brussels Airlines
Mon, 8 Sep - Sun, 14 Sep
LHR
London
IAD
Washington
€505 Return, found 4 days ago
€505
Return
found 4 days ago
Select Brussels Airlines flight, departing Mon, 8 Sep from London to Washington, returning Sun, 14 Sep, priced at €505 found 4 days ago
Scandinavian Airlines
Wed, 22 Oct - Mon, 27 Oct
LHR
London
IAD
Washington
€518 Return, found 1 day ago
€518
Return
found 1 day ago
Select Scandinavian Airlines flight, departing Wed, 22 Oct from London to Washington, returning Mon, 27 Oct, priced at €518 found 1 day ago
Lufthansa
Mon, 8 Sep - Sun, 14 Sep
LHR
London
IAD
Washington
€529 Return, found 4 days ago
€529
Return
found 4 days ago
Select Lufthansa flight, departing Mon, 8 Sep from London to Washington, returning Sun, 14 Sep, priced at €529 found 4 days ago
Air Canada
Mon, 8 Sep - Sun, 14 Sep
LHR
London
IAD
Washington
€529 Return, found 4 days ago
€529
Return
found 4 days ago
Select Air Canada flight, departing Mon, 8 Sep from London to Washington, returning Sun, 14 Sep, priced at €529 found 4 days ago
British Airways
Sat, 14 Feb - Sun, 22 Feb
LHR
London
IAD
Washington
€545 Return, found 4 days ago
€545
Return
found 4 days ago
Select British Airways flight, departing Sat, 14 Feb from London to Washington, returning Sun, 22 Feb, priced at €545 found 4 days ago

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

October is typically the cheapest month to fly

From €408 - €711 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, Lufthansa, Royal Air Maroc, Scandinavian Airlines, Swiss International Air Lines, TAP Portugal, Turkish Airlines, United, Virgin Atlantic
Return price
€449
Distance
5866 km
Average flight time
3 hours 15 mins

Perfect flights from London to Washington

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Picture yourself strolling through the streets of , surrounded by breathtaking architecture and absorbing the vibrant atmosphere of this captivating city. Indulge in the mouth-watering local specialties, from tantalizing street food to exquisite fine dining. With Expedia, you can experience all of this and more, without sacrificing your budget.
 
Our flexible Heathrow to Washington Dulles Intl. ticket options cater to your travel preferences, with incredible one-way fares from €404 and roundtrip prices from €449. 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 €449. 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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