€406 Cheap Flights London to Washington (LHR-IAD)

View €406 flight on Thu, 18 Sep 2025Opens in a new window

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

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 15% on select hotels after you book a flight*
  • payments icon

    Earn twice

    Earn your airline miles on top of our rewards
    Sign in

Cheap flights from London to Washington (LHR-IAD)

Prices were available within the past 7 days and start at €406 for one-way flights and €455 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Icelandair
Sun, 7 Dec - Sun, 14 Dec
LHR
London
IAD
Washington
€455 Return, found 1 day ago
€455
Return
found 1 day ago
Select Icelandair flight, departing Sun, 7 Dec from London to Washington, returning Sun, 14 Dec, priced at €455 found 1 day ago
Aer Lingus
Sun, 25 Jan - Fri, 30 Jan
LHR
London
IAD
Washington
€464 Return, found 6 days ago
€464
Return
found 6 days ago
Select Aer Lingus flight, departing Sun, 25 Jan from London to Washington, returning Fri, 30 Jan, priced at €464 found 6 days ago
TAP Portugal
Thu, 18 Sep - Thu, 2 Oct
LHR
London
IAD
Washington
€475 Return, found 6 days ago
€475
Return
found 6 days ago
Select TAP Portugal flight, departing Thu, 18 Sep from London to Washington, returning Thu, 2 Oct, priced at €475 found 6 days ago
Scandinavian Airlines
Fri, 26 Dec - Wed, 31 Dec
LHR
London
IAD
Washington
€531 Return, found 5 hours ago
€531
Return
found 5 hours ago
Select Scandinavian Airlines flight, departing Fri, 26 Dec from London to Washington, returning Wed, 31 Dec, priced at €531 found 5 hours ago
Swiss International Air Lines
Sat, 13 Sep - Mon, 22 Sep
LHR
London
IAD
Washington
€540 Return, found 2 days ago
€540
Return
found 2 days ago
Select Swiss International Air Lines flight, departing Sat, 13 Sep from London to Washington, returning Mon, 22 Sep, priced at €540 found 2 days ago
Austrian Airlines
Sat, 13 Sep - Mon, 22 Sep
LHR
London
IAD
Washington
€541 Return, found 2 days ago
€541
Return
found 2 days ago
Select Austrian Airlines flight, departing Sat, 13 Sep from London to Washington, returning Mon, 22 Sep, priced at €541 found 2 days ago
Lufthansa
Sat, 13 Sep - Mon, 22 Sep
LHR
London
IAD
Washington
€541 Return, found 2 days ago
€541
Return
found 2 days ago
Select Lufthansa flight, departing Sat, 13 Sep from London to Washington, returning Mon, 22 Sep, priced at €541 found 2 days ago
Brussels Airlines
Sat, 6 Sep - Tue, 9 Sep
LHR
London
IAD
Washington
€544 Return, found 3 days ago
€544
Return
found 3 days ago
Select Brussels Airlines flight, departing Sat, 6 Sep from London to Washington, returning Tue, 9 Sep, priced at €544 found 3 days ago
Austrian Airlines
Sat, 13 Sep - Mon, 22 Sep
LHR
London
IAD
Washington
€569 Return, found 2 days ago
€569
Return
found 2 days ago
Select Austrian Airlines flight, departing Sat, 13 Sep from London to Washington, returning Mon, 22 Sep, priced at €569 found 2 days ago
British Airways
Thu, 25 Sep - Wed, 1 Oct
LHR
London
IAD
Washington
€570 Return, found 14 hours ago
€570
Return
found 14 hours ago
Select British Airways flight, departing Thu, 25 Sep from London to Washington, returning Wed, 1 Oct, priced at €570 found 14 hours ago

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

October is typically the cheapest month to fly

From €404 - €716 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
€455
Distance
5866 km
Average flight time
3 hours 15 mins

Perfect flights from London to Washington

Embark on an unforgettable journey without breaking the bank with Expedia's incredible deals on cheap flights from London to Washington. Whether you're aching for a romantic escape with your partner, craving an adventurous solo expedition, or yearning to immerse yourself in the local history and culture, we've got you covered.
 
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 €406 and roundtrip prices from €455. 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 €455. 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.

Explore a world of travel with Expedia

*Available to Expedia members.