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

View AU$352 flight on Thu, 23 Oct 2025Opens in a new window

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

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

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

TAP Portugal
Wed, 6 May - Wed, 20 May
IAD
Washington
LHR
London
AU$709 Return, found 6 days ago
AU$709
Return
found 6 days ago
Select TAP Portugal flight, departing Wed, 6 May from Washington to London, returning Wed, 20 May, priced at AU$709 found 6 days ago
Icelandair
Thu, 12 Feb - Fri, 27 Feb
IAD
Washington
LHR
London
AU$804 Return, found 2 hours ago
AU$804
Return
found 2 hours ago
Select Icelandair flight, departing Thu, 12 Feb from Washington to London, returning Fri, 27 Feb, priced at AU$804 found 2 hours ago
Aer Lingus
Sun, 25 Jan - Tue, 3 Feb
IAD
Washington
LHR
London
AU$857 Return, found 5 days ago
AU$857
Return
found 5 days ago
Select Aer Lingus flight, departing Sun, 25 Jan from Washington to London, returning Tue, 3 Feb, priced at AU$857 found 5 days ago
Delta
Wed, 26 Nov - Wed, 3 Dec
IAD
Washington
LHR
London
AU$890 Return, found 3 days ago
AU$890
Return
found 3 days ago
Select Delta flight, departing Wed, 26 Nov from Washington to London, returning Wed, 3 Dec, priced at AU$890 found 3 days ago
Virgin Atlantic
Tue, 18 Nov - Thu, 27 Nov
IAD
Washington
LHR
London
AU$917 Return, found 5 days ago
AU$917
Return
found 5 days ago
Select Virgin Atlantic flight, departing Tue, 18 Nov from Washington to London, returning Thu, 27 Nov, priced at AU$917 found 5 days ago
United
Wed, 19 Nov - Thu, 27 Nov
IAD
Washington
LHR
London
AU$921 Return, found 5 days ago
AU$921
Return
found 5 days ago
Select United flight, departing Wed, 19 Nov from Washington to London, returning Thu, 27 Nov, priced at AU$921 found 5 days ago
British Airways
Wed, 26 Nov - Wed, 3 Dec
IAD
Washington
LHR
London
AU$963 Return, found 3 days ago
AU$963
Return
found 3 days ago
Select British Airways flight, departing Wed, 26 Nov from Washington to London, returning Wed, 3 Dec, priced at AU$963 found 3 days ago
Air France
Wed, 26 Nov - Wed, 3 Dec
IAD
Washington
LHR
London
AU$969 Return, found 3 days ago
AU$969
Return
found 3 days ago
Select Air France flight, departing Wed, 26 Nov from Washington to London, returning Wed, 3 Dec, priced at AU$969 found 3 days ago
KLM
Sun, 19 Oct - Tue, 28 Oct
IAD
Washington
LHR
London
AU$983 Return, found 16 hours ago
AU$983
Return
found 16 hours ago
Select KLM flight, departing Sun, 19 Oct from Washington to London, returning Tue, 28 Oct, priced at AU$983 found 16 hours ago
Brussels Airlines
Wed, 1 Apr - Fri, 17 Apr
IAD
Washington
LHR
London
AU$1,013 Return, found 2 hours ago
AU$1,013
Return
found 2 hours ago
Select Brussels Airlines flight, departing Wed, 1 Apr from Washington to London, returning Fri, 17 Apr, priced at AU$1,013 found 2 hours ago

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

October is typically the cheapest month to fly

From AU$677 - AU$1,374 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 AU$709. 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
Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Delta, Finnair, Iberia, Icelandair, KLM, Lufthansa, Scandinavian Airlines, Swiss International Air Lines, TAP Portugal, Turkish Airlines, United, Virgin Atlantic, avianca
Return price
AU$709
Distance
5866 km
Average flight time
12 hours 20 mins

Book with confidence

Your quick guide to flights from Washington to London

Pick up great flights from Washington to London

With Expedia, you have your pick of flights a day with 20 airlines covering flights from Washington to London. Whether you’re on a business trip, a family holiday or a luxury break, just enter your travel dates, hit search then check out your choice of flights. Select from return, one way or multi-city flights, and use the advance search tool if you want a direct or refundable flight. You can narrow your search to show you just your preferred cabin class and airline, too. It’s all easy. You can book direct flights from Washington to London that take around hours.

Find cheap flights from Washington to London

From the great flight deals with prices currently ranging from AU$709 to AU$1,013, you can choose to see the cheapest flights first. Generally, you can book the cheapest flights from Washington to London around 4 to 6 weeks in advance. If your travel dates are flexible, try to avoid weekends and peak seasons – when you are more likely to grab the lowest prices. Even last minute, there are some impressive deals. The cheapest time to fly to London is normally in May.

Reasons to book your flight from Washington to London with Expedia

Expedia makes it easy to find, book, and travel, with everything you need all in one place. When you enter your travel details, find fantastic deals just for you on flight tickets from Washington to London across all the main airline carriers, so you can save time, dollars, and hassle finding the perfect flight. If you think your plans could change, choose refundable flights so any changes won’t cost you more. Book your flight to London right now and, if you join Expedia Rewards, you earn points this time and every time you travel with Expedia.

Your quick guide to flights from Washington to London

Explore a world of travel with Expedia

*Available to Expedia members.