€301 Cheap Flights Washington to London (IAD-LHR)

View €301 flight on Wed, 4 Feb 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 €301 for one-way flights and €386 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

TAP Portugal
Mon, 9 Mar - Mon, 16 Mar
IAD
Washington
LHR
London
€386 Return, found 3 days ago
€386
Return
found 3 days ago
Select TAP Portugal flight, departing Mon, 9 Mar from Washington to London, returning Mon, 16 Mar, priced at €386 found 3 days ago
TAP Portugal
Mon, 19 Jan - Tue, 27 Jan
IAD
Washington
LHR
London
€392 Return, found 1 day ago
€392
Return
found 1 day ago
Select TAP Portugal flight, departing Mon, 19 Jan from Washington to London, returning Tue, 27 Jan, priced at €392 found 1 day ago
Icelandair
Sat, 24 Jan - Wed, 28 Jan
IAD
Washington
LHR
London
€447 Return, found 5 days ago
€447
Return
found 5 days ago
Select Icelandair flight, departing Sat, 24 Jan from Washington to London, returning Wed, 28 Jan, priced at €447 found 5 days ago
British Airways
Mon, 19 Jan - Tue, 27 Jan
IAD
Washington
LHR
London
€483 Return, found 1 day ago
€483
Return
found 1 day ago
Select British Airways flight, departing Mon, 19 Jan from Washington to London, returning Tue, 27 Jan, priced at €483 found 1 day ago
Aer Lingus
Mon, 19 Jan - Tue, 27 Jan
IAD
Washington
LHR
London
€489 Return, found 1 day ago
€489
Return
found 1 day ago
Select Aer Lingus flight, departing Mon, 19 Jan from Washington to London, returning Tue, 27 Jan, priced at €489 found 1 day ago
Scandinavian Airlines
Sat, 24 Jan - Wed, 28 Jan
IAD
Washington
LHR
London
€500 Return, found 5 days ago
€500
Return
found 5 days ago
Select Scandinavian Airlines flight, departing Sat, 24 Jan from Washington to London, returning Wed, 28 Jan, priced at €500 found 5 days ago
United
Mon, 19 Jan - Tue, 27 Jan
IAD
Washington
LHR
London
€510 Return, found 1 day ago
€510
Return
found 1 day ago
Select United flight, departing Mon, 19 Jan from Washington to London, returning Tue, 27 Jan, priced at €510 found 1 day ago
Austrian Airlines
Mon, 19 Jan - Tue, 27 Jan
IAD
Washington
LHR
London
€521 Return, found 1 day ago
€521
Return
found 1 day ago
Select Austrian Airlines flight, departing Mon, 19 Jan from Washington to London, returning Tue, 27 Jan, priced at €521 found 1 day ago
Swiss International Air Lines
Tue, 14 Apr - Fri, 24 Apr
IAD
Washington
LHR
London
€526 Return, found 1 day ago
€526
Return
found 1 day ago
Select Swiss International Air Lines flight, departing Tue, 14 Apr from Washington to London, returning Fri, 24 Apr, priced at €526 found 1 day ago
Brussels Airlines
Tue, 14 Apr - Fri, 24 Apr
IAD
Washington
LHR
London
€548 Return, found 1 day ago
€548
Return
found 1 day ago
Select Brussels Airlines flight, departing Tue, 14 Apr from Washington to London, returning Fri, 24 Apr, priced at €548 found 1 day ago

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

February is typically the cheapest month to fly

From €383 - €682 per traveller.
Washington to London route information
Origin airport
Washington Dulles Intl.
Destination airport
Heathrow
Airlines serving
Aer Lingus, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, Icelandair, KLM, Lufthansa, Royal Air Maroc, TAP Portugal, Turkish Airlines, United, Virgin Atlantic
Return price
€385
Distance
5866 km
Average flight time
12 hours 22 mins

Perfect flights from Washington to London

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Our flexible Washington Dulles Intl. to Heathrow ticket options cater to your travel preferences, with incredible one-way fares from €301 and roundtrip prices from €386. Whether you're planning a short city break or a longer adventure, our dynamic pricing ensures that you find the best deals for your journey.
 
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Planning your next great adventure is a breeze with Expedia. Our user-friendly platform, unbeatable prices, and round-the-clock customer support are designed to make your travel experience seamless and stress-free. So, why wait? Book your to travel arrangements today and embark on the journey of a lifetime in London.

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 €386. 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.

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