S$488 Cheap Flights from Washington to London

View S$488 flight on Sun, 3 May, 2026Opens in a new window

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$488 for one-way flights and S$782 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sun, 8 Mar - Tue, 17 Mar
IAD
Washington
LHR
London
S$782 Return, found 4 days ago
S$782
Return
found 4 days ago
Select United flight, departing Sun, 8 Mar from Washington to London, returning Tue, 17 Mar, priced at S$782 found 4 days ago
Swiss International Air Lines
Sun, 8 Mar - Tue, 17 Mar
IAD
Washington
LHR
London
S$794 Return, found 4 days ago
S$794
Return
found 4 days ago
Select Swiss International Air Lines flight, departing Sun, 8 Mar from Washington to London, returning Tue, 17 Mar, priced at S$794 found 4 days ago
United
Sun, 8 Mar - Tue, 17 Mar
IAD
Washington
LHR
London
S$796 Return, found 4 days ago
S$796
Return
found 4 days ago
Select United flight, departing Sun, 8 Mar from Washington to London, returning Tue, 17 Mar, priced at S$796 found 4 days ago
Swiss International Air Lines
Sun, 8 Mar - Tue, 17 Mar
IAD
Washington
LHR
London
S$808 Return, found 4 days ago
S$808
Return
found 4 days ago
Select Swiss International Air Lines flight, departing Sun, 8 Mar from Washington to London, returning Tue, 17 Mar, priced at S$808 found 4 days ago
Air Canada
Sun, 8 Mar - Tue, 17 Mar
IAD
Washington
LHR
London
S$809 Return, found 4 days ago
S$809
Return
found 4 days ago
Select Air Canada flight, departing Sun, 8 Mar from Washington to London, returning Tue, 17 Mar, priced at S$809 found 4 days ago
Virgin Atlantic
Sun, 8 Mar - Tue, 17 Mar
IAD
Washington
LHR
London
S$817 Return, found 4 days ago
S$817
Return
found 4 days ago
Select Virgin Atlantic flight, departing Sun, 8 Mar from Washington to London, returning Tue, 17 Mar, priced at S$817 found 4 days ago
Lufthansa
Sun, 8 Mar - Tue, 17 Mar
IAD
Washington
LHR
London
S$821 Return, found 4 days ago
S$821
Return
found 4 days ago
Select Lufthansa flight, departing Sun, 8 Mar from Washington to London, returning Tue, 17 Mar, priced at S$821 found 4 days ago
Austrian Airlines
Sun, 8 Mar - Tue, 17 Mar
IAD
Washington
LHR
London
S$834 Return, found 4 days ago
S$834
Return
found 4 days ago
Select Austrian Airlines flight, departing Sun, 8 Mar from Washington to London, returning Tue, 17 Mar, priced at S$834 found 4 days ago
KLM
Sun, 8 Mar - Tue, 17 Mar
IAD
Washington
LHR
London
S$854 Return, found 4 days ago
S$854
Return
found 4 days ago
Select KLM flight, departing Sun, 8 Mar from Washington to London, returning Tue, 17 Mar, priced at S$854 found 4 days ago
Air France
Sun, 8 Mar - Tue, 17 Mar
IAD
Washington
LHR
London
S$861 Return, found 4 days ago
S$861
Return
found 4 days ago
Select Air France flight, departing Sun, 8 Mar from Washington to London, returning Tue, 17 Mar, priced at S$861 found 4 days ago

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

February is typically the cheapest month to fly

From S$579 - S$1,030 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$782. 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 France, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, KLM, Lufthansa, Scandinavian Airlines, Turkish Airlines, United, Virgin Atlantic
Return price
S$782
Distance
5866 km
Average flight time
12 hours 20 mins

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Perfect flights from Washington to London

Your Journey from Washington to London

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

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