€350 Cheap Flights Washington to London (IAD-LHR)

View €350 flight on Mon, 10 Aug 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 €350 for one-way flights and €624 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Scandinavian Airlines
Mon, 27 Apr - Fri, 1 May
IAD
Washington
LHR
London
€624 Return, found 3 days ago
€624
Return
found 3 days ago
Select Scandinavian Airlines flight, departing Mon, 27 Apr from Washington to London, returning Fri, 1 May, priced at €624 found 3 days ago
TAP Portugal
Wed, 11 Nov - Fri, 27 Nov
IAD
Washington
LHR
London
€632 Return, found 6 days ago
€632
Return
found 6 days ago
Select TAP Portugal flight, departing Wed, 11 Nov from Washington to London, returning Fri, 27 Nov, priced at €632 found 6 days ago
Icelandair
Fri, 11 Sept - Thu, 17 Sept
IAD
Washington
LHR
London
€675 Return, found 6 days ago
€675
Return
found 6 days ago
Select Icelandair flight, departing Fri, 11 Sept from Washington to London, returning Thu, 17 Sept, priced at €675 found 6 days ago
Aer Lingus
Wed, 19 Aug - Tue, 25 Aug
IAD
Washington
LHR
London
€718 Return, found 16 hours ago
€718
Return
found 16 hours ago
Select Aer Lingus flight, departing Wed, 19 Aug from Washington to London, returning Tue, 25 Aug, priced at €718 found 16 hours ago
Turkish Airlines
Tue, 8 Sept - Mon, 14 Sept
IAD
Washington
LHR
London
€719 Return, found 6 days ago
€719
Return
found 6 days ago
Select Turkish Airlines flight, departing Tue, 8 Sept from Washington to London, returning Mon, 14 Sept, priced at €719 found 6 days ago
Iberia
Mon, 27 Apr - Tue, 5 May
IAD
Washington
LHR
London
€741 Return, found 1 day ago
€741
Return
found 1 day ago
Select Iberia flight, departing Mon, 27 Apr from Washington to London, returning Tue, 5 May, priced at €741 found 1 day ago
Brussels Airlines
Wed, 19 Aug - Tue, 25 Aug
IAD
Washington
LHR
London
€745 Return, found 16 hours ago
€745
Return
found 16 hours ago
Select Brussels Airlines flight, departing Wed, 19 Aug from Washington to London, returning Tue, 25 Aug, priced at €745 found 16 hours ago
American Airlines
Wed, 19 Aug - Tue, 25 Aug
IAD
Washington
LHR
London
€752 Return, found 16 hours ago
€752
Return
found 16 hours ago
Select American Airlines flight, departing Wed, 19 Aug from Washington to London, returning Tue, 25 Aug, priced at €752 found 16 hours ago
British Airways
Sun, 3 May - Tue, 12 May
IAD
Washington
LHR
London
€752 Return, found 10 hours ago
€752
Return
found 10 hours ago
Select British Airways flight, departing Sun, 3 May from Washington to London, returning Tue, 12 May, priced at €752 found 10 hours ago
Virgin Atlantic
Wed, 19 Aug - Tue, 25 Aug
IAD
Washington
LHR
London
€752 Return, found 16 hours ago
€752
Return
found 16 hours ago
Select Virgin Atlantic flight, departing Wed, 19 Aug from Washington to London, returning Tue, 25 Aug, priced at €752 found 16 hours ago

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

April is typically the cheapest month to fly

From €410 - €792 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 €624. 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, Brussels Airlines, Delta, Finnair, ITA Airways, Iberia, KLM, Lufthansa, Royal Air Maroc, Scandinavian Airlines, Swiss International Air Lines, TAP Portugal, Turkish Airlines, United, Virgin Atlantic
Return price
€624
Distance
5866 km
Average flight time
12 hours 32 mins

Book with confidence

Perfect flights from Washington to London

Embark on an unforgettable journey without breaking the bank with Expedia's incredible deals on cheap flights from Washington to London. Whether you're aching for a romantic escape with your partner, craving an adventurous solo expedition, or yearning to immerse yourself in the local history and culture, we've got you covered.
 
Picture yourself strolling through the streets of , surrounded by breathtaking architecture and absorbing the vibrant atmosphere of this captivating city. Indulge in the mouth-watering local specialties, from tantalizing street food to exquisite fine dining. With Expedia, you can experience all of this and more, without sacrificing your budget.
 
Our flexible Washington Dulles Intl. to Heathrow ticket options cater to your travel preferences, with incredible one-way fares from €350 and roundtrip prices from €624. 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.
 
But the magic doesn't stop there. Expedia offers a range of partner services to enhance your trip. Rent a car at Heathrow and explore and its surrounding areas at your own pace. Discover hidden gems off the beaten path, and create unforgettable memories. We also provide a handpicked selection of accommodations, from charming bed and breakfasts to luxury hotels, ensuring that you have a comfortable and memorable stay.
 
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.
Perfect flights from Washington to London

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