฿21,285 Cheap Flights from London (LHR) to Washington (IAD)

View ฿21,285 flight on Wed, 2 Sept 2026Opens in a new window

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

  • Be in the know

    Get alerts if flight prices drop or rise*

  • Book smarter

    Save up to 40% on select hotels after you book a flight*

  • Earn twice

    Earn your airline miles on top of our rewards
    Sign in

Cheap Flights from London (LHR) to Washington (IAD)

Prices were available within the past 7 days and start at ฿21,285 for one-way flights and ฿22,865 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Swiss International Air Lines
Mon, 11 May - Mon, 18 May
LHR
London
IAD
Washington
฿22,865 Return, found 5 hours ago
฿22,865
Return
found 5 hours ago
Select Swiss International Air Lines flight, departing Mon, 11 May from London to Washington, returning Mon, 18 May, priced at ฿22,865 found 5 hours ago
Austrian Airlines
Mon, 11 May - Mon, 18 May
LHR
London
IAD
Washington
฿22,935 Return, found 5 hours ago
฿22,935
Return
found 5 hours ago
Select Austrian Airlines flight, departing Mon, 11 May from London to Washington, returning Mon, 18 May, priced at ฿22,935 found 5 hours ago
Lufthansa
Thu, 30 Apr - Thu, 7 May
LHR
London
IAD
Washington
฿23,065 Return, found 1 day ago
฿23,065
Return
found 1 day ago
Select Lufthansa flight, departing Thu, 30 Apr from London to Washington, returning Thu, 7 May, priced at ฿23,065 found 1 day ago
Brussels Airlines
Thu, 30 Apr - Thu, 7 May
LHR
London
IAD
Washington
฿23,095 Return, found 1 day ago
฿23,095
Return
found 1 day ago
Select Brussels Airlines flight, departing Thu, 30 Apr from London to Washington, returning Thu, 7 May, priced at ฿23,095 found 1 day ago
Austrian Airlines
Mon, 11 May - Mon, 18 May
LHR
London
IAD
Washington
฿23,635 Return, found 5 hours ago
฿23,635
Return
found 5 hours ago
Select Austrian Airlines flight, departing Mon, 11 May from London to Washington, returning Mon, 18 May, priced at ฿23,635 found 5 hours ago
Lufthansa
Thu, 30 Apr - Thu, 7 May
LHR
London
IAD
Washington
฿23,765 Return, found 1 day ago
฿23,765
Return
found 1 day ago
Select Lufthansa flight, departing Thu, 30 Apr from London to Washington, returning Thu, 7 May, priced at ฿23,765 found 1 day ago
United
Mon, 11 May - Mon, 18 May
LHR
London
IAD
Washington
฿24,065 Return, found 5 hours ago
฿24,065
Return
found 5 hours ago
Select United flight, departing Mon, 11 May from London to Washington, returning Mon, 18 May, priced at ฿24,065 found 5 hours ago
United
Mon, 11 May - Mon, 18 May
LHR
London
IAD
Washington
฿24,065 Return, found 5 hours ago
฿24,065
Return
found 5 hours ago
Select United flight, departing Mon, 11 May from London to Washington, returning Mon, 18 May, priced at ฿24,065 found 5 hours ago
American Airlines
Mon, 11 May - Mon, 18 May
LHR
London
IAD
Washington
฿24,250 Return, found 5 hours ago
฿24,250
Return
found 5 hours ago
Select American Airlines flight, departing Mon, 11 May from London to Washington, returning Mon, 18 May, priced at ฿24,250 found 5 hours ago
British Airways
Mon, 11 May - Mon, 18 May
LHR
London
IAD
Washington
฿25,380 Return, found 5 hours ago
฿25,380
Return
found 5 hours ago
Select British Airways flight, departing Mon, 11 May from London to Washington, returning Mon, 18 May, priced at ฿25,380 found 5 hours ago

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 ฿22,865. 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.

Travel information

Origin airport
Heathrow
Destination airport
Washington Dulles Intl.
Airlines serving
Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Delta, Finnair, Iberia, Icelandair, KLM, Lufthansa, Swiss International Air Lines, TAP Portugal, Turkish Airlines, United
Return price
฿22,865
Distance
5866 km
Average flight time
3 hours 11 mins

Book with confidence

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 ฿21,285 and roundtrip prices from ฿22,865. 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.
Perfect flights from London to Washington
*Available to Expedia members.