฿16,365 Cheap Flights from London (LHR) to Washington (IAD)

View ฿16,365 flight on Sun, 30 Nov 2025Opens 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 ฿16,365 for one-way flights and ฿18,215 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sat, 13 Sept - Sat, 20 Sept
LHR
London
IAD
Washington
฿18,215 Return, found 1 day ago
฿18,215
Return
found 1 day ago
Select Delta flight, departing Sat, 13 Sept from London to Washington, returning Sat, 20 Sept, priced at ฿18,215 found 1 day ago
KLM
Sat, 13 Sept - Sat, 20 Sept
LHR
London
IAD
Washington
฿19,090 Return, found 1 day ago
฿19,090
Return
found 1 day ago
Select KLM flight, departing Sat, 13 Sept from London to Washington, returning Sat, 20 Sept, priced at ฿19,090 found 1 day ago
KLM
Sat, 13 Sept - Sat, 20 Sept
LHR
London
IAD
Washington
฿19,965 Return, found 1 day ago
฿19,965
Return
found 1 day ago
Select KLM flight, departing Sat, 13 Sept from London to Washington, returning Sat, 20 Sept, priced at ฿19,965 found 1 day ago
Delta
Sat, 13 Sept - Sat, 20 Sept
LHR
London
IAD
Washington
฿23,015 Return, found 1 day ago
฿23,015
Return
found 1 day ago
Select Delta flight, departing Sat, 13 Sept from London to Washington, returning Sat, 20 Sept, priced at ฿23,015 found 1 day ago
Austrian Airlines
Tue, 14 Jul - Fri, 24 Jul
LHR
London
IAD
Washington
฿24,660 Return, found 1 day ago
฿24,660
Return
found 1 day ago
Select Austrian Airlines flight, departing Tue, 14 Jul from London to Washington, returning Fri, 24 Jul, priced at ฿24,660 found 1 day ago
KLM
Sat, 13 Sept - Sat, 20 Sept
LHR
London
IAD
Washington
฿24,765 Return, found 1 day ago
฿24,765
Return
found 1 day ago
Select KLM flight, departing Sat, 13 Sept from London to Washington, returning Sat, 20 Sept, priced at ฿24,765 found 1 day ago
Lufthansa
Tue, 14 Jul - Fri, 24 Jul
LHR
London
IAD
Washington
฿24,780 Return, found 1 day ago
฿24,780
Return
found 1 day ago
Select Lufthansa flight, departing Tue, 14 Jul from London to Washington, returning Fri, 24 Jul, priced at ฿24,780 found 1 day ago
Austrian Airlines
Tue, 14 Jul - Fri, 24 Jul
LHR
London
IAD
Washington
฿25,295 Return, found 1 day ago
฿25,295
Return
found 1 day ago
Select Austrian Airlines flight, departing Tue, 14 Jul from London to Washington, returning Fri, 24 Jul, priced at ฿25,295 found 1 day ago
Lufthansa
Tue, 14 Jul - Fri, 24 Jul
LHR
London
IAD
Washington
฿25,415 Return, found 1 day ago
฿25,415
Return
found 1 day ago
Select Lufthansa flight, departing Tue, 14 Jul from London to Washington, returning Fri, 24 Jul, priced at ฿25,415 found 1 day ago
United
Tue, 14 Jul - Fri, 24 Jul
LHR
London
IAD
Washington
฿25,710 Return, found 1 day ago
฿25,710
Return
found 1 day ago
Select United flight, departing Tue, 14 Jul from London to Washington, returning Fri, 24 Jul, priced at ฿25,710 found 1 day ago

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

October is typically the cheapest month to fly

From ฿15,243 - ฿27,767 per traveller.
Flight from London to Washington route information
Origin airport
Heathrow
Destination airport
Washington Dulles Intl.
Return price
฿18,215
Distance
5866 km
Average flight time
3 hours 14 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 ฿16,365 and roundtrip prices from ฿18,215. 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.
 
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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 ฿18,215. 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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