S$724 Cheap Flights from London to Washington

View S$724 flight on Wed, 4 Mar, 2026Opens 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 S$724 for one-way flights and S$719 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Austrian Airlines
Thu, 22 Jan - Mon, 26 Jan
LHR
London
IAD
Washington
S$719 Return, found 2 days ago
S$719
Return
found 2 days ago
Select Austrian Airlines flight, departing Thu, 22 Jan from London to Washington, returning Mon, 26 Jan, priced at S$719 found 2 days ago
Lufthansa
Thu, 22 Jan - Mon, 26 Jan
LHR
London
IAD
Washington
S$724 Return, found 2 days ago
S$724
Return
found 2 days ago
Select Lufthansa flight, departing Thu, 22 Jan from London to Washington, returning Mon, 26 Jan, priced at S$724 found 2 days ago
Brussels Airlines
Thu, 22 Jan - Mon, 26 Jan
LHR
London
IAD
Washington
S$725 Return, found 2 days ago
S$725
Return
found 2 days ago
Select Brussels Airlines flight, departing Thu, 22 Jan from London to Washington, returning Mon, 26 Jan, priced at S$725 found 2 days ago
United
Fri, 18 Sept - Wed, 30 Sept
LHR
London
IAD
Washington
S$744 Return, found 2 days ago
S$744
Return
found 2 days ago
Select United flight, departing Fri, 18 Sept from London to Washington, returning Wed, 30 Sept, priced at S$744 found 2 days ago
Austrian Airlines
Thu, 22 Jan - Mon, 26 Jan
LHR
London
IAD
Washington
S$744 Return, found 2 days ago
S$744
Return
found 2 days ago
Select Austrian Airlines flight, departing Thu, 22 Jan from London to Washington, returning Mon, 26 Jan, priced at S$744 found 2 days ago
Brussels Airlines
Thu, 29 Jan - Wed, 4 Feb
LHR
London
IAD
Washington
S$758 Return, found 4 days ago
S$758
Return
found 4 days ago
Select Brussels Airlines flight, departing Thu, 29 Jan from London to Washington, returning Wed, 4 Feb, priced at S$758 found 4 days ago
United
Thu, 22 Jan - Mon, 26 Jan
LHR
London
IAD
Washington
S$763 Return, found 2 days ago
S$763
Return
found 2 days ago
Select United flight, departing Thu, 22 Jan from London to Washington, returning Mon, 26 Jan, priced at S$763 found 2 days ago
Lufthansa
Fri, 18 Sept - Wed, 30 Sept
LHR
London
IAD
Washington
S$769 Return, found 2 days ago
S$769
Return
found 2 days ago
Select Lufthansa flight, departing Fri, 18 Sept from London to Washington, returning Wed, 30 Sept, priced at S$769 found 2 days ago
American Airlines
Thu, 16 Apr - Thu, 23 Apr
LHR
London
IAD
Washington
S$784 Return, found 2 days ago
S$784
Return
found 2 days ago
Select American Airlines flight, departing Thu, 16 Apr from London to Washington, returning Thu, 23 Apr, priced at S$784 found 2 days ago
Swiss International Air Lines
Fri, 18 Sept - Wed, 30 Sept
LHR
London
IAD
Washington
S$805 Return, found 2 days ago
S$805
Return
found 2 days ago
Select Swiss International Air Lines flight, departing Fri, 18 Sept from London to Washington, returning Wed, 30 Sept, priced at S$805 found 2 days ago

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

February is typically the cheapest month to fly

From S$600 - S$1,007 per traveller.

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 S$719. 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
American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Finnair, Lufthansa, Scandinavian Airlines, United, Virgin Atlantic
Return price
S$719
Distance
5866 km
Average flight time
3 hours 36 mins

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Perfect flights from London to Washington

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*Note: Prices may vary based on availability and are subject to change.
Perfect flights from London to Washington

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