Cheap Flights from Washington (IAD) to London (LHR) from HK$2,918~

View HK$2,918 flight on Mon, 12 Jan 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at HK$2,918 for one-way flights and HK$4,696 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Tue, 9 Dec - Tue, 16 Dec
IAD
Washington
LHR
London
HK$4,696 Return, found 6 days ago
HK$4,696
Return
found 6 days ago
Select United flight, departing Tue, 9 Dec from Washington to London, returning Tue, 16 Dec, priced at HK$4,696 found 6 days ago
Air Canada
Tue, 9 Dec - Tue, 16 Dec
IAD
Washington
LHR
London
HK$4,747 Return, found 6 days ago
HK$4,747
Return
found 6 days ago
Select Air Canada flight, departing Tue, 9 Dec from Washington to London, returning Tue, 16 Dec, priced at HK$4,747 found 6 days ago
United
Mon, 12 Jan - Mon, 19 Jan
IAD
Washington
LHR
London
HK$4,870 Return, found 3 days ago
HK$4,870
Return
found 3 days ago
Select United flight, departing Mon, 12 Jan from Washington to London, returning Mon, 19 Jan, priced at HK$4,870 found 3 days ago
United
Tue, 9 Dec - Tue, 16 Dec
IAD
Washington
LHR
London
HK$4,895 Return, found 6 days ago
HK$4,895
Return
found 6 days ago
Select United flight, departing Tue, 9 Dec from Washington to London, returning Tue, 16 Dec, priced at HK$4,895 found 6 days ago
Swiss International Air Lines
Tue, 9 Dec - Tue, 16 Dec
IAD
Washington
LHR
London
HK$4,912 Return, found 6 days ago
HK$4,912
Return
found 6 days ago
Select Swiss International Air Lines flight, departing Tue, 9 Dec from Washington to London, returning Tue, 16 Dec, priced at HK$4,912 found 6 days ago
Virgin Atlantic
Tue, 9 Dec - Tue, 16 Dec
IAD
Washington
LHR
London
HK$4,918 Return, found 6 days ago
HK$4,918
Return
found 6 days ago
Select Virgin Atlantic flight, departing Tue, 9 Dec from Washington to London, returning Tue, 16 Dec, priced at HK$4,918 found 6 days ago
Delta
Tue, 9 Dec - Tue, 16 Dec
IAD
Washington
LHR
London
HK$4,918 Return, found 6 days ago
HK$4,918
Return
found 6 days ago
Select Delta flight, departing Tue, 9 Dec from Washington to London, returning Tue, 16 Dec, priced at HK$4,918 found 6 days ago
United
Mon, 12 Jan - Mon, 19 Jan
IAD
Washington
LHR
London
HK$4,954 Return, found 3 days ago
HK$4,954
Return
found 3 days ago
Select United flight, departing Mon, 12 Jan from Washington to London, returning Mon, 19 Jan, priced at HK$4,954 found 3 days ago
United
Mon, 12 Jan - Mon, 19 Jan
IAD
Washington
LHR
London
HK$4,976 Return, found 3 days ago
HK$4,976
Return
found 3 days ago
Select United flight, departing Mon, 12 Jan from Washington to London, returning Mon, 19 Jan, priced at HK$4,976 found 3 days ago
United
Mon, 12 Jan - Mon, 19 Jan
IAD
Washington
LHR
London
HK$4,987 Return, found 3 days ago
HK$4,987
Return
found 3 days ago
Select United flight, departing Mon, 12 Jan from Washington to London, returning Mon, 19 Jan, priced at HK$4,987 found 3 days ago

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

January is typically the cheapest month to fly

From HK$3,465 - HK$6,558 per traveller.
Washington to London route information
Origin airport
Washington Dulles Intl.
Destination airport
Heathrow
Airlines serving
American Airlines, Austrian Airlines, Delta, Finnair, Swiss International Air Lines, Turkish Airlines, United, Virgin Atlantic
Return price
HK$4,696
Distance
5866 km
Average flight time
12 hours 22 mins

Flights from Chantilly to London

Book cheap flights from Chantilly (IAD) to London (LHR) on Expedia.com.hk. Find the best flight deals to destinations around the world for your next leisure or business travel on Expedia.com.hk.

Search for flights from Chantilly (IAD) to London (LHR) to find great flight deals suitable to your travel date and time. Expedia.com.hk flight booking search engine is simple to use and looking for cheap flights is as easy as a click of a mouse or on your mobile devices.

Be assured that you’re seeing the best price guaranteed! Our friendly customer service representatives are here to serve you 24 hours day to provide assistance and answer any questions that you may have about booking your Chantilly (IAD) to London (LHR) trip. Call us at 3077-4857 (direct number - 24 hours day for English).

Save more when combine your London flight with a hotel for a package deal! Discover additional savings by booking in advance. Now you can find activities in London and things to do in London for your perfect vacation with Expedia Thing to Do.

If you would like to book flights to London more flexibly, many prefer to purchase one-way tickets with options to take different airlines. A one way ticket to London is HK$2,918 now!

 

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 HK$4,696. 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 kilometers 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.

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