Cheap flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport from £374
This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/11. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — IAD
25 Nov — 2 Dec1
Return
1 adult
Economy
Return
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London Heathrow to Washington, D.C. Dulles Intl are usually found in February or March, booked 48 days in advance, depart on a Friday or Wednesday and return on a Tuesday
Cheap flight deals from Heathrow to Dulles Intl
Enter your travel dates to find the best prices.
Cheapest
Best
Direct
Last-minute
One-way
Cheapest flights from Heathrow to Dulles Intl
Explore the most affordable flight options available from Heathrow to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 26 October 2026.
Thu 29/1020:35 -
1 stop26h 55m
Fri 4/1219:40 -
1 stop18h 50m
Deal found 21/10£404
Tue 1/1220:35 -
1 stop26h 55m
Sun 6/1219:40 -
1 stop18h 50m
Deal found 21/10£404
Mon 23/1118:30 -
1 stop25h 10m
Sun 6/1222:30 -
1 stop19h 10m
Deal found 23/10£405
Wed 2/1220:35 -
1 stop26h 55m
Wed 9/1219:40 -
1 stop18h 50m
Deal found 22/10£406
Sat 5/1220:35 -
1 stop26h 55m
Sat 12/1219:40 -
1 stop18h 50m
Deal found 21/10£407
Tue 8/1212:15 -
1 stop11h 15m
Fri 11/1219:40 -
1 stop18h 50m
Deal found 23/10£408
Thu 3/1220:35 -
1 stop26h 55m
Wed 9/1219:40 -
1 stop18h 50m
Deal found 22/10£409
Tue 1/1220:35 -
1 stop26h 55m
Mon 28/1219:40 -
1 stop10h 10m
Deal found 24/10£410
Thu 24/1212:15 -
1 stop11h 15m
Wed 6/119:40 -
1 stop10h 10m
Deal found 21/10£410
Wed 2/1208:15 -
1 stop17h 15m
Fri 4/1222:30 -
1 stop14h 00m
Deal found 25/10£411
Fri 30/1012:15 -
1 stop11h 15m
Mon 16/1119:40 -
1 stop10h 10m
Deal found 22/10£412
Fri 25/1212:15 -
1 stop11h 15m
Fri 8/119:40 -
1 stop18h 50m
Deal found 22/10£413
Best flights from Heathrow to Dulles Intl
Discover carefully curated flight deals from Heathrow to Dulles Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 26 October 2026.
Mon 19/409:50 -
1 stop10h 55m
Tue 4/522:25 -
Nonstop7h 25m
Deal found 23/10£456
Mon 23/1108:40 -
1 stop12h 15m
Wed 9/1218:20 -
1 stop11h 10m
Deal found 21/10£469
Mon 23/1106:30 -
1 stop14h 25m
Thu 3/1220:45 -
Nonstop7h 25m
Deal found 23/10£486
Wed 2/1207:30 -
1 stop12h 05m
Sun 6/1218:20 -
Nonstop7h 20m
Deal found 21/10£501
Thu 11/212:05 -
Nonstop8h 35m
Mon 15/218:20 -
Nonstop7h 20m
Deal found 25/10£535
Thu 5/1106:00 -
1 stop14h 15m
Sat 24/421:35 -
1 stop31h 45m
Deal found 25/10£549
Sun 21/309:00 -
1 stop13h 00m
Sun 28/318:25 -
Nonstop7h 30m
Deal found 22/10£504
Sat 7/1113:05 -
Nonstop8h 40m
Sat 14/1118:55 -
Nonstop7h 25m
Deal found 21/10£572
Fri 25/1212:05 -
Nonstop8h 35m
Fri 8/110:05 -
1 stop14h 50m
Deal found 22/10£525
Sun 28/311:05 -
1 stop32h 15m
Sun 4/418:25 -
Nonstop7h 30m
Deal found 21/10£529
Sat 14/1118:00 -
1 stop26h 45m
Sun 15/1122:35 -
1 stop17h 45m
Deal found 25/10£541
Direct flights from Heathrow to Dulles Intl
Explore direct flight options from Heathrow to Dulles Intl based on user searches, and compare prices and availability for your desired travel dates. Data last updated 26 October 2026.
Thu 21/116:25 -
Nonstop8h 30m
Tue 9/218:05 -
Nonstop7h 10m
Deal found 22/10£412
Tue 1/1216:25 -
Nonstop8h 30m
Sun 6/1218:05 -
Nonstop7h 10m
Deal found 21/10£454
Fri 15/114:00 -
Nonstop8h 40m
Fri 22/119:30 -
Nonstop7h 25m
Deal found 24/10£454
Thu 26/1113:20 -
Nonstop8h 40m
Wed 2/1218:55 -
Nonstop7h 25m
Deal found 21/10£462
Mon 15/313:20 -
Nonstop8h 40m
Tue 30/322:35 -
Nonstop7h 25m
Deal found 22/10£463
Mon 23/1113:20 -
Nonstop8h 40m
Sun 6/1218:55 -
Nonstop7h 25m
Deal found 23/10£466
Sun 28/213:05 -
Nonstop8h 40m
Mon 15/319:55 -
Nonstop7h 25m
Deal found 22/10£467
Sun 10/113:05 -
Nonstop8h 40m
Fri 15/119:30 -
Nonstop7h 25m
Deal found 21/10£469
Sun 10/113:05 -
Nonstop8h 40m
Fri 15/119:30 -
Nonstop7h 25m
Deal found 25/10£469
Mon 23/1113:20 -
Nonstop8h 40m
Sun 6/1218:55 -
Nonstop7h 25m
Deal found 23/10£474
Fri 20/1116:25 -
Nonstop8h 30m
Tue 1/1221:45 -
Nonstop7h 15m
Deal found 25/10£475
Fri 20/1116:25 -
Nonstop8h 30m
Sun 29/1121:45 -
Nonstop7h 15m
Deal found 25/10£475
Last-minute flights from Heathrow to Dulles Intl
Discover last-minute flight deals from Heathrow to Dulles Intl. Data last updated 26 October 2026 and is based on user searches.
Thu 29/1020:35 -
1 stop26h 55m
Fri 4/1219:40 -
1 stop18h 50m
Deal found 21/10£404
Fri 30/1012:15 -
1 stop11h 15m
Mon 16/1119:40 -
1 stop10h 10m
Deal found 22/10£412
Wed 4/1118:30 -
1 stop25h 45m
Sun 8/1122:30 -
1 stop19h 10m
Deal found 22/10£417
Wed 4/1118:30 -
1 stop25h 45m
Thu 26/1117:25 -
1 stop13h 00m
Deal found 22/10£421
Thu 5/1106:00 -
1 stop14h 15m
Sat 14/1117:25 -
1 stop13h 00m
Deal found 21/10£424
Thu 5/1106:00 -
1 stop14h 15m
Fri 13/1122:30 -
1 stop19h 10m
Deal found 22/10£425
Wed 11/1118:30 -
1 stop25h 45m
Sun 15/1122:30 -
1 stop19h 10m
Deal found 22/10£422
Thu 19/1106:00 -
1 stop14h 15m
Tue 1/1217:25 -
1 stop23h 10m
Deal found 23/10£418
Mon 23/1118:30 -
1 stop25h 10m
Sun 6/1222:30 -
1 stop19h 10m
Deal found 23/10£405
Mon 23/1118:30 -
1 stop25h 10m
Wed 9/1222:30 -
1 stop14h 00m
Deal found 21/10£424
One-way flights from Heathrow to Dulles Intl
Search for one-way flight options from Heathrow to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated 26 October 2026.
Fri 6/1120:45 -
3 stops26h 45m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 21/10£374
Mon 23/1118:30 -
1 stop25h 10m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 22/10£374
Fri 13/1119:45 -
3 stops27h 45m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 24/10£375
Thu 19/1119:55 -
1 stop29h 35m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 22/10£376
Mon 9/1109:55 -
2 stops33h 45m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 21/10£377
Wed 9/1206:00 -
3 stops37h 49m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 25/10£378
Sun 13/1212:25 -
3 stops35h 40m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 24/10£380
Sat 12/1220:35 -
1 stop26h 55m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 24/10£380
Sat 21/1106:00 -
1 stop14h 15m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 21/10£381
Tue 3/1108:15 -
3 stops35h 30m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 26/10£382
Find flight deals from Heathrow to Dulles Intl
Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to Dulles Intl (IAD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 26 October 2026.
Customise your flight search to find flights from Heathrow to Dulles Intl that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated 26 October 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
Cheapest return flight
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Sat 24/4
21:25-19:20
1 stop26h 55m
Washington, D.C. Dulles Intl
Wed 31/12
00:00-06:00
Nonstop0h 00m
£374
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Wed 2/12
06:00-20:30
1 stop19h 30m
Washington, D.C. Dulles Intl
Wed 31/12
00:00-06:00
Nonstop0h 00m
£392
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Fri 29/1
16:25-19:55
Nonstop8h 30m
Washington, D.C. Dulles Intl
Wed 31/12
00:00-06:00
Nonstop0h 00m
£454
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Tue 19/1
12:15-15:40
Nonstop8h 25m
Washington, D.C. Dulles Intl
Wed 31/12
00:00-06:00
Nonstop0h 00m
£456
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Mon 19/4
09:50-15:45
1 stop10h 55m
Washington, D.C. Dulles Intl
Tue 4/5
22:25-10:50
Nonstop7h 25m
£456
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Mon 23/11
08:40-15:55
1 stop12h 15m
Washington, D.C. Dulles Intl
Wed 9/12
18:20-10:30
1 stop11h 10m
£469
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Wed 6/1
11:10-20:10
1 stop14h 00m
Washington, D.C. Dulles Intl
Wed 31/12
00:00-06:00
Nonstop0h 00m
£472
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Tue 5/1
18:00-21:28
1 stop32h 28m
Washington, D.C. Dulles Intl
Wed 31/12
00:00-06:00
Nonstop0h 00m
£472
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Wed 6/1
18:40-17:00
1 stop27h 20m
Washington, D.C. Dulles Intl
Wed 31/12
00:00-06:00
Nonstop0h 00m
£475
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Fri 11/12
09:30-00:24
2 stops19h 54m
Washington, D.C. Dulles Intl
Wed 31/12
00:00-06:00
Nonstop0h 00m
£477
Flights are sorted by cheapest return flights first.
Deals found on 25/10
Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3
Best time to book a flight from Heathrow to Dulles Intl
Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Heathrow with our price prediction graph.
LHR-IAD
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport
Prices
Delays
More
How far ahead should I book a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?
To ensure you get the cheapest price possible for a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport, you should look to book at least 47 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?
Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport (average of £481). Flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £588). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from LHR to IAD?
Find hourly flight availability from Heathrow to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 26 October 2026.
When flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
How much does it cost for a return flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?
Airfare is below average for this route at the moment.
London Heathrow Airport to Washington, D.C. Dulles Intl Airport flights typically cost between £473 and £673 in January.The cheapest return price found within the last 5 days was £403 on Icelandair (13 Jan–20 Jan).
How often are flights from London to Washington, D.C. delayed?
About 16% of weekly flights between London and Washington, D.C. have experienced delays in the past year, with the average delay time being 140 minutes.
What is the most punctual flight time for London to Washington, D.C. flights?
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Saturday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on London to Washington, D.C. flights?
Over the past year, United Airlines have had the lowest number of delays on this route, with just 10% of flights being delayed.
What’s the top stopover airport for flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?
Share of one-stop return flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport chosen by Cheapflights users in the past 12 months, using the same stopover each way.
Dublin (DUB) – chosen by Cheapflights users on 48% of one-stop itineraries from London Heathrow Airport to Washington, D.C. Dulles Intl Airport on Cheapflights.
What’s the cheapest stopover airport for flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?
Average return fare for one-stop flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport, chosen by Cheapflights users in the past 12 months, with the same stopover each way.
Lisbon (LIS) is the most affordable one-stop option, with an average return flight price of £458.
What’s the fastest stopover option from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?
Shortest average travel time for one-stop one-way flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.
Flights via Amsterdam (AMS) have the shortest average one-way travel time for one-stop routes: 11h 22m.
Which airport typically offers the quickest stopover for flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?
Average stopover duration for one-stop one-way flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Amsterdam (AMS) offer the fastest connection on this route, with an average stopover time of 1h 12m.
Reviews of airlines servicing Dulles Intl
Get insights into the airlines that provide service to Dulles Intl. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Dulles Intl. Reviews last updated 26 October 2026.
Read reviews from past customers who have flown with Austrian Airlines,Virgin Atlantic, andUnited Airlines
from London Heathrow Airport to Washington, D.C. Dulles Intl Airport. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Flight was delayed 2 1/2 hours. they told us mechanical. Otherwise, fine service
Related info for your journey
Find useful and relevant information for your journey from Heathrow to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
How long is the flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?
Airlines like British Airways, KLM, and Delta fly from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in about 10h 55m. The time it takes to get you to your destination can typically vary by up to 3h 30m. There are 3664 mi between London Heathrow Airport and Washington, D.C. Dulles Intl Airport. Both multi-stop and direct flights can be found to your destination and back.
What are the cheapest airlines flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport round-trip?
Currently priced at £323, Icelandair will fly you from London Heathrow Airport to Washington, D.C. Dulles Intl Airport and back. In addition to Icelandair, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from TAP AIR PORTUGAL and Virgin Atlantic - these airlines can fly you to your destination from £342 and £402, respectively. Icelandair is currently priced 40% below the average price you’ll pay for this route.
What are the cheapest airlines to fly from London Heathrow Airport to Washington, D.C. Dulles Intl Airport one-way?
One-way options have recently been found by users for as low as £334 on British Airways. Other airlines that offer cheap prices include Finnair from £361 and Aer Lingus from £417 one-way.
What are the most reliable airlines from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?
Consider Air Canada (74%), Austrian Airlines (74%) or Copa Airlines (74%) when booking your flight. These represent the most reliable airlines when flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport.
What are the cheapest flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?
On average you can expect to pay £1,245 for a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is £362 while the most popular route, (London Heathrow - Washington, D.C. Dulles Intl) is currently priced at £391.
Can I find deals for business class flights from Heathrow to Dulles Intl?
Yes. Cheapflights offers flight deals from Heathrow to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?
Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport (average of £481). Flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £588). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
Travelling to a place near Washington, D.C. Dulles Intl Airport?
Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Silver Spring
Alexandria
Gaithersburg
Oxon Hill
Hanover
Woodbridge
Glen Burnie
Springfield
Sterling
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Airlines
Alternative routes
Complete your trip
Direct flights to District of Columbia
Dulles Intl flight routes
Flights by cabin class
Other flight options
Other flights from Heathrow
Popular flights
Fly from Heathrow to Dulles Intl on these airlines
Choose from the following airlines for your flight from Heathrow to Dulles Intl. Flights are based on user searches made on Cheapflights and were last updated on 26 October 2026.
Explore flights to Dulles Intl departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 26 October 2026.
Browse through other flights departing from Heathrow. Flights are based on user searches made on Cheapflights and were last updated on 26 October 2026.
Top 10 airlines flying from Heathrow to Dulles Intl
Discover the top 10 airlines that operate flights from Heathrow to Dulles Intl. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated 26 October 2026.
Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.
How does Cheapflights help users find flights from Heathrow to Dulles Intl?
Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Heathrow to Dulles Intl. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.
Why should you use Cheapflights to find cheap flight tickets from Heathrow to Dulles Intl?
It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Heathrow to Dulles Intl.
Can Cheapflights find flights from Heathrow to Dulles Intl with no change fees?
Need flexible booking options for your flight to Dulles Intl from Heathrow? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.
Can Cheapflights notify me if prices for flights from Heathrow to Dulles Intl become cheaper?
Yes! Start tracking prices for Heathrow to Dulles Intl flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
We value your privacy
Cheapflights and its partners wish to use cookies or similar technologies to store and/or access information on and about your device and process personal data such as your IP address, device identifiers etc., in order to improve your experience on the site, to analyse navigation, to offer and measure personalised advertising, and to facilitate sharing on social networks. We also allow the use of third-party cookies (including those from our advertising partners) on our sites.
By clicking 'Accept', you consent to your data being processed by 0 vendors on this web site for the purposes described in this notice. You can review the vendors and their individual processing purposes on the .
To review individual processing purposes and cookie categories, please click ’Select individual purposes’. You can review your choices and withdraw your consent at any time by clicking the ’Privacy Preferences’ link in the page side navigation.