฿17,995 Cheap Flights from London (LHR) to Washington (IAD)

View ฿17,995 flight on Sun, 1 Feb 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at ฿17,995 for one-way flights and ฿23,935 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Iberia
Mon, 14 Sept - Mon, 28 Sept
LHR
London
IAD
Washington
฿23,935 Return, found 5 days ago
฿23,935
Return
found 5 days ago
Select Iberia flight, departing Mon, 14 Sept from London to Washington, returning Mon, 28 Sept, priced at ฿23,935 found 5 days ago
Iberia
Mon, 14 Sept - Mon, 28 Sept
LHR
London
IAD
Washington
฿24,380 Return, found 5 days ago
฿24,380
Return
found 5 days ago
Select Iberia flight, departing Mon, 14 Sept from London to Washington, returning Mon, 28 Sept, priced at ฿24,380 found 5 days ago
Delta
Mon, 14 Sept - Mon, 28 Sept
LHR
London
IAD
Washington
฿25,435 Return, found 5 days ago
฿25,435
Return
found 5 days ago
Select Delta flight, departing Mon, 14 Sept from London to Washington, returning Mon, 28 Sept, priced at ฿25,435 found 5 days ago
KLM
Mon, 14 Sept - Mon, 28 Sept
LHR
London
IAD
Washington
฿25,785 Return, found 5 days ago
฿25,785
Return
found 5 days ago
Select KLM flight, departing Mon, 14 Sept from London to Washington, returning Mon, 28 Sept, priced at ฿25,785 found 5 days ago
Iberia
Mon, 14 Sept - Mon, 28 Sept
LHR
London
IAD
Washington
฿25,945 Return, found 5 days ago
฿25,945
Return
found 5 days ago
Select Iberia flight, departing Mon, 14 Sept from London to Washington, returning Mon, 28 Sept, priced at ฿25,945 found 5 days ago
Finnair
Mon, 14 Sept - Mon, 28 Sept
LHR
London
IAD
Washington
฿26,205 Return, found 5 days ago
฿26,205
Return
found 5 days ago
Select Finnair flight, departing Mon, 14 Sept from London to Washington, returning Mon, 28 Sept, priced at ฿26,205 found 5 days ago
American Airlines
Mon, 14 Sept - Mon, 28 Sept
LHR
London
IAD
Washington
฿26,390 Return, found 5 days ago
฿26,390
Return
found 5 days ago
Select American Airlines flight, departing Mon, 14 Sept from London to Washington, returning Mon, 28 Sept, priced at ฿26,390 found 5 days ago
Air France
Mon, 14 Sept - Mon, 28 Sept
LHR
London
IAD
Washington
฿26,405 Return, found 5 days ago
฿26,405
Return
found 5 days ago
Select Air France flight, departing Mon, 14 Sept from London to Washington, returning Mon, 28 Sept, priced at ฿26,405 found 5 days ago
British Airways
Mon, 14 Sept - Mon, 28 Sept
LHR
London
IAD
Washington
฿26,500 Return, found 5 days ago
฿26,500
Return
found 5 days ago
Select British Airways flight, departing Mon, 14 Sept from London to Washington, returning Mon, 28 Sept, priced at ฿26,500 found 5 days ago
British Airways
Mon, 14 Sept - Mon, 28 Sept
LHR
London
IAD
Washington
฿29,065 Return, found 5 days ago
฿29,065
Return
found 5 days ago
Select British Airways flight, departing Mon, 14 Sept from London to Washington, returning Mon, 28 Sept, priced at ฿29,065 found 5 days ago

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

January is typically the cheapest month to fly

From ฿14,823 - ฿36,471 per traveller.
Flight from London to Washington route information
Origin airport
Heathrow
Destination airport
Washington Dulles Intl.
Airlines serving
Austrian Airlines, British Airways, Finnair, Lufthansa, United
Return price
฿23,935
Distance
5866 km
Average flight time
3 hours 36 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 ฿17,995 and roundtrip prices from ฿23,935. 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 ฿23,935. 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

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