S$631 Cheap Flights from Washington to London

View S$631 flight on Sun, 10 May, 2026Opens in a new window

Flight 1

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

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Cheap Flights from Washington to London (IAD-LHR)

Prices were available within the past 7 days and start at S$631 for one-way flights and S$970 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Scandinavian Airlines
Sun, 19 Apr - Tue, 28 Apr
IAD
Washington
LHR
London
S$970 Return, found 6 days ago
S$970
Return
found 6 days ago
Select Scandinavian Airlines flight, departing Sun, 19 Apr from Washington to London, returning Tue, 28 Apr, priced at S$970 found 6 days ago
Scandinavian Airlines
Sun, 19 Apr - Tue, 28 Apr
IAD
Washington
LHR
London
S$975 Return, found 6 days ago
S$975
Return
found 6 days ago
Select Scandinavian Airlines flight, departing Sun, 19 Apr from Washington to London, returning Tue, 28 Apr, priced at S$975 found 6 days ago
Scandinavian Airlines
Sun, 19 Apr - Tue, 28 Apr
IAD
Washington
LHR
London
S$979 Return, found 6 days ago
S$979
Return
found 6 days ago
Select Scandinavian Airlines flight, departing Sun, 19 Apr from Washington to London, returning Tue, 28 Apr, priced at S$979 found 6 days ago
Scandinavian Airlines
Sun, 19 Apr - Tue, 28 Apr
IAD
Washington
LHR
London
S$1,022 Return, found 6 days ago
S$1,022
Return
found 6 days ago
Select Scandinavian Airlines flight, departing Sun, 19 Apr from Washington to London, returning Tue, 28 Apr, priced at S$1,022 found 6 days ago
Scandinavian Airlines
Sun, 19 Apr - Tue, 28 Apr
IAD
Washington
LHR
London
S$1,027 Return, found 6 days ago
S$1,027
Return
found 6 days ago
Select Scandinavian Airlines flight, departing Sun, 19 Apr from Washington to London, returning Tue, 28 Apr, priced at S$1,027 found 6 days ago
Delta
Sun, 19 Apr - Tue, 28 Apr
IAD
Washington
LHR
London
S$1,129 Return, found 6 days ago
S$1,129
Return
found 6 days ago
Select Delta flight, departing Sun, 19 Apr from Washington to London, returning Tue, 28 Apr, priced at S$1,129 found 6 days ago
Virgin Atlantic
Sun, 19 Apr - Tue, 28 Apr
IAD
Washington
LHR
London
S$1,129 Return, found 6 days ago
S$1,129
Return
found 6 days ago
Select Virgin Atlantic flight, departing Sun, 19 Apr from Washington to London, returning Tue, 28 Apr, priced at S$1,129 found 6 days ago
United
Sun, 19 Apr - Tue, 28 Apr
IAD
Washington
LHR
London
S$1,129 Return, found 6 days ago
S$1,129
Return
found 6 days ago
Select United flight, departing Sun, 19 Apr from Washington to London, returning Tue, 28 Apr, priced at S$1,129 found 6 days ago
British Airways
Sun, 19 Apr - Tue, 28 Apr
IAD
Washington
LHR
London
S$1,165 Return, found 6 days ago
S$1,165
Return
found 6 days ago
Select British Airways flight, departing Sun, 19 Apr from Washington to London, returning Tue, 28 Apr, priced at S$1,165 found 6 days ago
Turkish Airlines
Wed, 22 Apr - Sat, 16 May
IAD
Washington
LHR
London
S$1,194 Return, found 2 days ago
S$1,194
Return
found 2 days ago
Select Turkish Airlines flight, departing Wed, 22 Apr from Washington to London, returning Sat, 16 May, priced at S$1,194 found 2 days ago

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

April is typically the cheapest month to fly

From S$606 - S$1,172 per traveller.

Frequently asked questions

How much is a flight from Washington Dulles Intl. Airport (IAD) to Heathrow Airport (LHR)?
Start packing your suitcase, because round-trip journeys from IAD to London Heathrow start from S$970. That's based on airfares listed within the last 7 days on Expedia for flights departing within the next year. Prices can change quickly, so book today to nab the best deal. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Dulles Intl. Airport to Heathrow Airport?
We understand that things come up unexpectedly, so we've made it as easy as possible for you to cancel your trip online. Just head to the Customer Service Portal and follow the instructions.
How do I find cheap flights from Dulles Intl. Airport to Heathrow Airport (LHR) 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 IAD to Heathrow Airport flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Dulles Intl. Airport to LHR?
You'll have 5,900 kilometres to cover on the long-haul Chantilly to Hounslow route. Dress in layers of comfortable clothes and consider taking a sleep mask and earplugs.
Which airlines fly direct from Washington Dulles Intl. Airport (IAD) to Heathrow Airport?
With 60 flights a month from Dulles Intl. Airport to LHR, United Airlines (UA) is an excellent choice. Another carrier operating on this route is British Airways (BA). You'll have 60 flights every month to choose from.
Are IAD to LHR flight tickets cheaper when they're purchased at the last minute?
Booking your trip from IAD to London Heathrow at the last minute could be your ticket to a great deal. However, it could end up costing a great deal more! If you'd prefer to err on the side of caution, book well ahead of your departure date. In fact, Expedia has some of the biggest bargains up to a year in advance. If your preferred carrier hasn't released tickets yet, check back regularly as deals are updated on Expedia all the time.

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Heathrow
Airlines serving
Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, KLM, Lufthansa, Scandinavian Airlines, United, Virgin Atlantic
Return price
S$969
Distance
5866 km
Average flight time
12 hours 32 mins

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