฿11,120 Cheap Flights from Washington (IAD) to London (LHR)

View ฿11,120 flight on Wed, 12 Aug 2026Opens 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 ฿11,120 for one-way flights and ฿18,325 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

TAP Portugal
Mon, 20 Apr - Tue, 28 Apr
IAD
Washington
LHR
London
฿18,325 Return, found 1 day ago
฿18,325
Return
found 1 day ago
Select TAP Portugal flight, departing Mon, 20 Apr from Washington to London, returning Tue, 28 Apr, priced at ฿18,325 found 1 day ago
United
Mon, 20 Apr - Tue, 28 Apr
IAD
Washington
LHR
London
฿19,950 Return, found 1 day ago
฿19,950
Return
found 1 day ago
Select United flight, departing Mon, 20 Apr from Washington to London, returning Tue, 28 Apr, priced at ฿19,950 found 1 day ago
British Airways
Mon, 20 Apr - Tue, 28 Apr
IAD
Washington
LHR
London
฿20,170 Return, found 1 day ago
฿20,170
Return
found 1 day ago
Select British Airways flight, departing Mon, 20 Apr from Washington to London, returning Tue, 28 Apr, priced at ฿20,170 found 1 day ago
United
Mon, 20 Apr - Tue, 28 Apr
IAD
Washington
LHR
London
฿20,315 Return, found 1 day ago
฿20,315
Return
found 1 day ago
Select United flight, departing Mon, 20 Apr from Washington to London, returning Tue, 28 Apr, priced at ฿20,315 found 1 day ago
United
Mon, 20 Apr - Tue, 28 Apr
IAD
Washington
LHR
London
฿20,400 Return, found 1 day ago
฿20,400
Return
found 1 day ago
Select United flight, departing Mon, 20 Apr from Washington to London, returning Tue, 28 Apr, priced at ฿20,400 found 1 day ago
United
Mon, 20 Apr - Tue, 28 Apr
IAD
Washington
LHR
London
฿20,865 Return, found 1 day ago
฿20,865
Return
found 1 day ago
Select United flight, departing Mon, 20 Apr from Washington to London, returning Tue, 28 Apr, priced at ฿20,865 found 1 day ago
Swiss International Air Lines
Mon, 20 Apr - Tue, 28 Apr
IAD
Washington
LHR
London
฿20,900 Return, found 1 day ago
฿20,900
Return
found 1 day ago
Select Swiss International Air Lines flight, departing Mon, 20 Apr from Washington to London, returning Tue, 28 Apr, priced at ฿20,900 found 1 day ago
United
Mon, 20 Apr - Tue, 28 Apr
IAD
Washington
LHR
London
฿20,970 Return, found 1 day ago
฿20,970
Return
found 1 day ago
Select United flight, departing Mon, 20 Apr from Washington to London, returning Tue, 28 Apr, priced at ฿20,970 found 1 day ago
Virgin Atlantic
Mon, 20 Apr - Tue, 28 Apr
IAD
Washington
LHR
London
฿21,080 Return, found 1 day ago
฿21,080
Return
found 1 day ago
Select Virgin Atlantic flight, departing Mon, 20 Apr from Washington to London, returning Tue, 28 Apr, priced at ฿21,080 found 1 day ago
Swiss International Air Lines
Mon, 20 Apr - Tue, 28 Apr
IAD
Washington
LHR
London
฿21,150 Return, found 1 day ago
฿21,150
Return
found 1 day ago
Select Swiss International Air Lines flight, departing Mon, 20 Apr from Washington to London, returning Tue, 28 Apr, priced at ฿21,150 found 1 day ago
Flight from Washington to London route information
Origin airport
Washington Dulles Intl.
Destination airport
Heathrow
Airlines serving
Air France, Austrian Airlines, British Airways, Delta, ITA Airways, Iberia, KLM, Lufthansa, TAP Portugal, Turkish Airlines, United
Return price
฿18,325
Distance
5866 km
Average flight time
12 hours 25 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 , 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 ฿11,120 and roundtrip prices from ฿18,325. 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.

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 ฿18,325. 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.
*Available to Expedia members.