฿7,555 Cheap Flights from Washington (IAD) to London (LHR)

View ฿7,555 flight on Sun, 30 Nov 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 ฿7,555 for one-way flights and ฿14,730 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

TAP Portugal
Tue, 3 Mar - Tue, 10 Mar
IAD
Washington
LHR
London
฿14,730 Return, found 14 hours ago
฿14,730
Return
found 14 hours ago
Select TAP Portugal flight, departing Tue, 3 Mar from Washington to London, returning Tue, 10 Mar, priced at ฿14,730 found 14 hours ago
TAP Portugal
Fri, 16 Jan - Thu, 22 Jan
IAD
Washington
LHR
London
฿14,995 Return, found 2 days ago
฿14,995
Return
found 2 days ago
Select TAP Portugal flight, departing Fri, 16 Jan from Washington to London, returning Thu, 22 Jan, priced at ฿14,995 found 2 days ago
Icelandair
Tue, 3 Mar - Tue, 10 Mar
IAD
Washington
LHR
London
฿17,800 Return, found 14 hours ago
฿17,800
Return
found 14 hours ago
Select Icelandair flight, departing Tue, 3 Mar from Washington to London, returning Tue, 10 Mar, priced at ฿17,800 found 14 hours ago
Icelandair
Fri, 16 Jan - Thu, 22 Jan
IAD
Washington
LHR
London
฿18,695 Return, found 2 days ago
฿18,695
Return
found 2 days ago
Select Icelandair flight, departing Fri, 16 Jan from Washington to London, returning Thu, 22 Jan, priced at ฿18,695 found 2 days ago
United
Mon, 20 Oct - Tue, 28 Oct
IAD
Washington
LHR
London
฿19,685 Return, found 5 days ago
฿19,685
Return
found 5 days ago
Select United flight, departing Mon, 20 Oct from Washington to London, returning Tue, 28 Oct, priced at ฿19,685 found 5 days ago
Air Canada
Mon, 20 Oct - Tue, 28 Oct
IAD
Washington
LHR
London
฿19,900 Return, found 5 days ago
฿19,900
Return
found 5 days ago
Select Air Canada flight, departing Mon, 20 Oct from Washington to London, returning Tue, 28 Oct, priced at ฿19,900 found 5 days ago
United
Mon, 24 Nov - Mon, 1 Dec
IAD
Washington
LHR
London
฿20,260 Return, found 1 day ago
฿20,260
Return
found 1 day ago
Select United flight, departing Mon, 24 Nov from Washington to London, returning Mon, 1 Dec, priced at ฿20,260 found 1 day ago
Swiss International Air Lines
Mon, 20 Oct - Tue, 28 Oct
IAD
Washington
LHR
London
฿20,605 Return, found 5 days ago
฿20,605
Return
found 5 days ago
Select Swiss International Air Lines flight, departing Mon, 20 Oct from Washington to London, returning Tue, 28 Oct, priced at ฿20,605 found 5 days ago
Delta
Mon, 20 Oct - Tue, 28 Oct
IAD
Washington
LHR
London
฿20,620 Return, found 5 days ago
฿20,620
Return
found 5 days ago
Select Delta flight, departing Mon, 20 Oct from Washington to London, returning Tue, 28 Oct, priced at ฿20,620 found 5 days ago
Lufthansa
Wed, 19 Nov - Wed, 26 Nov
IAD
Washington
LHR
London
฿20,645 Return, found 1 day ago
฿20,645
Return
found 1 day ago
Select Lufthansa flight, departing Wed, 19 Nov from Washington to London, returning Wed, 26 Nov, priced at ฿20,645 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 ฿14,538 - ฿29,501 per traveller.
Flight from Washington to London route information
Origin airport
Washington Dulles Intl.
Destination airport
Heathrow
Airlines serving
Air France, American Airlines, Austrian Airlines, British Airways, Delta, Finnair, Iberia, KLM, Lufthansa, United
Return price
฿14,730
Distance
5866 km
Average flight time
12 hours 21 mins

Perfect flights from Washington to London

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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 ฿7,555 and roundtrip prices from ฿14,730. 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 ฿14,730. 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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