฿7,560 Cheap Flights from Washington (IAD) to London (LHR)

View ฿7,560 flight on Mon, 8 Sep 2025Opens in a new window

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

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

Prices were available within the past 7 days and start at ฿7,560 for one-way flights and ฿14,770 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

TAP Portugal
Mon, 8 Sep - Mon, 15 Sep
IAD
Washington
LHR
London
฿14,770 Return, found 5 days ago
฿14,770
Return
found 5 days ago
Select TAP Portugal flight, departing Mon, 8 Sep from Washington to London, returning Mon, 15 Sep, priced at ฿14,770 found 5 days ago
TAP Portugal
Mon, 8 Sep - Mon, 15 Sep
IAD
Washington
LHR
London
฿19,010 Return, found 5 days ago
฿19,010
Return
found 5 days ago
Select TAP Portugal flight, departing Mon, 8 Sep from Washington to London, returning Mon, 15 Sep, priced at ฿19,010 found 5 days ago
Delta
Mon, 4 Aug - Wed, 20 Aug
IAD
Washington
LHR
London
฿19,020 Return, found 3 days ago
฿19,020
Return
found 3 days ago
Select Delta flight, departing Mon, 4 Aug from Washington to London, returning Wed, 20 Aug, priced at ฿19,020 found 3 days ago
KLM
Mon, 4 Aug - Wed, 20 Aug
IAD
Washington
LHR
London
฿19,870 Return, found 3 days ago
฿19,870
Return
found 3 days ago
Select KLM flight, departing Mon, 4 Aug from Washington to London, returning Wed, 20 Aug, priced at ฿19,870 found 3 days ago
British Airways
Sun, 31 Aug - Sat, 4 Oct
IAD
Washington
LHR
London
฿20,350 Return, found 10 hours ago
฿20,350
Return
found 10 hours ago
Select British Airways flight, departing Sun, 31 Aug from Washington to London, returning Sat, 4 Oct, priced at ฿20,350 found 10 hours ago
Icelandair
Mon, 1 Sep - Sat, 4 Oct
IAD
Washington
LHR
London
฿20,620 Return, found 10 hours ago
฿20,620
Return
found 10 hours ago
Select Icelandair flight, departing Mon, 1 Sep from Washington to London, returning Sat, 4 Oct, priced at ฿20,620 found 10 hours ago
United
Mon, 1 Sep - Wed, 1 Oct
IAD
Washington
LHR
London
฿20,640 Return, found 10 hours ago
฿20,640
Return
found 10 hours ago
Select United flight, departing Mon, 1 Sep from Washington to London, returning Wed, 1 Oct, priced at ฿20,640 found 10 hours ago
Delta
Wed, 26 Nov - Wed, 3 Dec
IAD
Washington
LHR
London
฿20,790 Return, found 2 days ago
฿20,790
Return
found 2 days ago
Select Delta flight, departing Wed, 26 Nov from Washington to London, returning Wed, 3 Dec, priced at ฿20,790 found 2 days ago
Austrian Airlines
Mon, 1 Sep - Wed, 1 Oct
IAD
Washington
LHR
London
฿21,900 Return, found 10 hours ago
฿21,900
Return
found 10 hours ago
Select Austrian Airlines flight, departing Mon, 1 Sep from Washington to London, returning Wed, 1 Oct, priced at ฿21,900 found 10 hours ago
Air France
Thu, 27 Nov - Wed, 3 Dec
IAD
Washington
LHR
London
฿21,925 Return, found 2 days ago
฿21,925
Return
found 2 days ago
Select Air France flight, departing Thu, 27 Nov from Washington to London, returning Wed, 3 Dec, priced at ฿21,925 found 2 days ago

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

October is typically the cheapest month to fly

From ฿14,664 - ฿26,226 per traveller.

Graph displaying average flight prices per month

Flight from 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, Delta, Finnair, Iberia, KLM, Lufthansa, Turkish Airlines, United
Return price
฿14,770
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 ฿7,560 and roundtrip prices from ฿14,770. 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 ฿14,770. 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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