€197 Cheap Flights Washington to London (IAD-LHR)

View €197 flight on Tue, 12 Aug 2025Opens 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 €197 for one-way flights and €444 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Mon, 11 Aug - Wed, 20 Aug
IAD
Washington
LHR
London
€444 Return, found 3 days ago
€444
Return
found 3 days ago
Select Delta flight, departing Mon, 11 Aug from Washington to London, returning Wed, 20 Aug, priced at €444 found 3 days ago
Virgin Atlantic
Tue, 19 Aug - Tue, 26 Aug
IAD
Washington
LHR
London
€444 Return, found 4 days ago
€444
Return
found 4 days ago
Select Virgin Atlantic flight, departing Tue, 19 Aug from Washington to London, returning Tue, 26 Aug, priced at €444 found 4 days ago
Iberia
Sun, 10 Aug - Tue, 19 Aug
IAD
Washington
LHR
London
€445 Return, found 1 day ago
€445
Return
found 1 day ago
Select Iberia flight, departing Sun, 10 Aug from Washington to London, returning Tue, 19 Aug, priced at €445 found 1 day ago
Iberia
Mon, 6 Oct - Wed, 5 Nov
IAD
Washington
LHR
London
€446 Return, found 3 days ago
€446
Return
found 3 days ago
Select Iberia flight, departing Mon, 6 Oct from Washington to London, returning Wed, 5 Nov, priced at €446 found 3 days ago
Iberia
Wed, 16 Jul - Fri, 29 Aug
IAD
Washington
LHR
London
€455 Return, found 3 days ago
€455
Return
found 3 days ago
Select Iberia flight, departing Wed, 16 Jul from Washington to London, returning Fri, 29 Aug, priced at €455 found 3 days ago
TAP Portugal
Mon, 18 Aug - Mon, 25 Aug
IAD
Washington
LHR
London
€455 Return, found 1 day ago
€455
Return
found 1 day ago
Select TAP Portugal flight, departing Mon, 18 Aug from Washington to London, returning Mon, 25 Aug, priced at €455 found 1 day ago
Icelandair
Sat, 6 Sep - Wed, 10 Sep
IAD
Washington
LHR
London
€460 Return, found 5 days ago
€460
Return
found 5 days ago
Select Icelandair flight, departing Sat, 6 Sep from Washington to London, returning Wed, 10 Sep, priced at €460 found 5 days ago
KLM
Mon, 6 Oct - Wed, 5 Nov
IAD
Washington
LHR
London
€488 Return, found 3 days ago
€488
Return
found 3 days ago
Select KLM flight, departing Mon, 6 Oct from Washington to London, returning Wed, 5 Nov, priced at €488 found 3 days ago
Aer Lingus
Wed, 16 Jul - Fri, 29 Aug
IAD
Washington
LHR
London
€489 Return, found 3 days ago
€489
Return
found 3 days ago
Select Aer Lingus flight, departing Wed, 16 Jul from Washington to London, returning Fri, 29 Aug, priced at €489 found 3 days ago
Scandinavian Airlines
Mon, 18 Aug - Mon, 25 Aug
IAD
Washington
LHR
London
€516 Return, found 1 day ago
€516
Return
found 1 day ago
Select Scandinavian Airlines flight, departing Mon, 18 Aug from Washington to London, returning Mon, 25 Aug, priced at €516 found 1 day ago

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

October is typically the cheapest month to fly

From €382 - €671 per traveller.

Graph displaying average flight prices per month

Washington to London route 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, Iberia, Icelandair, KLM, Lufthansa, Royal Air Maroc, Scandinavian Airlines, Swiss International Air Lines, TAP Portugal, Turkish Airlines, United, Virgin Atlantic
Return price
€443
Distance
5866 km
Average flight time
12 hours 23 mins

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 London, 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 €197 and roundtrip prices from €444. 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 London 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 IAD to LHR 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 €444. 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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