฿7,545 Cheap Flights from Washington (IAD) to London (LON)

View ฿7,545 flight on Thu, 27 Nov 2025Opens in a new window

Popular airlines from Washington Dulles International Airport (IAD) to London

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

Prices were available within the past 7 days and start at ฿7,545 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 4 days ago
฿14,770
Return
found 4 days ago
Select TAP Portugal flight, departing Mon, 8 Sep from Washington to London, returning Mon, 15 Sep, priced at ฿14,770 found 4 days ago
TAP Portugal
Thu, 27 Nov - Wed, 3 Dec
IAD
Washington
LGW
London
฿17,340 Return, found 2 days ago
฿17,340
Return
found 2 days ago
Select TAP Portugal flight, departing Thu, 27 Nov from Washington to London, returning Wed, 3 Dec, priced at ฿17,340 found 2 days ago
TAP Portugal
Mon, 8 Sep - Mon, 15 Sep
IAD
Washington
LHR
London
฿19,010 Return, found 4 days ago
฿19,010
Return
found 4 days ago
Select TAP Portugal flight, departing Mon, 8 Sep from Washington to London, returning Mon, 15 Sep, priced at ฿19,010 found 4 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
United
Wed, 26 Nov - Wed, 3 Dec
IAD
Washington
LHR
London
฿20,195 Return, found 1 day ago
฿20,195
Return
found 1 day ago
Select United flight, departing Wed, 26 Nov from Washington to London, returning Wed, 3 Dec, priced at ฿20,195 found 1 day ago
KLM
Mon, 4 Aug - Wed, 20 Aug
IAD
Washington
LCY
London
฿20,245 Return, found 3 days ago
฿20,245
Return
found 3 days ago
Select KLM flight, departing Mon, 4 Aug from Washington to London, returning Wed, 20 Aug, priced at ฿20,245 found 3 days ago
Virgin Atlantic
Thu, 27 Nov - Wed, 3 Dec
IAD
Washington
LHR
London
฿20,465 Return, found 2 days ago
฿20,465
Return
found 2 days ago
Select Virgin Atlantic flight, departing Thu, 27 Nov from Washington to London, returning Wed, 3 Dec, priced at ฿20,465 found 2 days ago
United
Wed, 26 Nov - Wed, 3 Dec
IAD
Washington
LHR
London
฿20,790 Return, found 1 day ago
฿20,790
Return
found 1 day ago
Select United flight, departing Wed, 26 Nov from Washington to London, returning Wed, 3 Dec, priced at ฿20,790 found 1 day ago
Delta
Wed, 26 Nov - Wed, 3 Dec
IAD
Washington
LHR
London
฿20,790 Return, found 1 day ago
฿20,790
Return
found 1 day ago
Select Delta flight, departing Wed, 26 Nov from Washington to London, returning Wed, 3 Dec, priced at ฿20,790 found 1 day ago

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

March is typically the cheapest month to fly

From ฿12,277 - ฿24,262 per traveller.

Graph displaying average flight prices per month

Flight from Washington to London route information
Origin airport
Washington Dulles Intl.
Destination airport
Heathrow
Return price
฿14,770
Distance
5866 km

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 LON-All Airports ticket options cater to your travel preferences, with incredible one-way fares from ฿7,545 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 LON-All Airports 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 IAD to London (LON-All Airports)?
If you're travelling from Washington Dulles Intl. Airport (IAD) to London (LON-All Airports), round-trip journeys start from ฿14,770. This figure is based on fares listed within the last 7 days on Expedia for flights departing within the next year, so don't let a good deal slip through your fingers. Book today and save yourself money and time. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from IAD to London (LON-All Airports)?
This varies between airlines, as each has its own terms and conditions. Head to the Customer Service Portal, where there are easy-to-follow instructions on how to cancel your flight online.
How do I find cheap flights from Dulles Intl. Airport to London (LON-All Airports) 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 Dulles Intl. Airport to London (LON-All Airports) flights, you'll see a "no change fees" filter for you to select.
How far is the flight from IAD to London (LON-All Airports)?
The distance is around 5,900 kilometres, so fill your carry-on luggage with whatever you need to make your journey comfortable. Wondering what to take on board your Chantilly to England flight? A travel pillow, earplugs and a sleep mask are among the essentials.
Which airlines fly direct from Washington Dulles Intl. Airport (IAD) to London (LON-All Airports)?
United Airlines (UA) is the number one choice for many travellers. It offers 60 flights from Dulles Intl. Airport to London (LON-All Airports) each month. If you want more options, check out the fares from British Airways (BA). This airlines operates 60 monthly flights between these airports.
Are Dulles Intl. Airport to London (LON-All Airports) flight tickets cheaper when they're purchased at the last minute?
It is possible to pick up great last-minute deals from IAD to London (LON-All Airports), but it can also be hit-or-miss. As many airlines release seats up to a year in advance, it's worth keeping an eye on fares early and being ready to book when you spot a good bargain. Expedia compares carrier prices and updates flight deals regularly, so you can rest easy knowing you're always getting the latest offers.

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London Airports

London

Washington to Heathrow
฿14,770.00
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Washington

Baltimore

*Available to Expedia members.