Cheap flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport from £354
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 31/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — IAD
2 Oct — 9 Oct1
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 September, booked 82 days in advance, depart on a Friday or Thursday and return on a Monday
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 2 September 2026.
Thu 10/915:50 -
Nonstop8h 25m
Wed 23/922:05 -
Nonstop7h 35m
Deal found 1/9£431
Tue 29/908:55 -
1 stop12h 10m
Tue 6/1022:05 -
Nonstop7h 35m
Deal found 1/9£432
Sat 3/1015:50 -
Nonstop8h 25m
Fri 9/1017:30 -
1 stop22h 25m
Deal found 1/9£433
Mon 14/915:50 -
Nonstop8h 25m
Sat 3/406:10 -
1 stop20h 00m
Deal found 1/9£434
Sat 12/916:20 -
1 stop24h 25m
Sun 28/310:05 -
1 stop15h 20m
Deal found 1/9£434
Sat 12/908:20 -
1 stop14h 26m
Thu 7/120:45 -
Nonstop7h 25m
Deal found 1/9£437
Tue 20/1017:05 -
Nonstop8h 15m
Sun 25/1022:45 -
Nonstop7h 15m
Deal found 1/9£439
Tue 3/1108:40 -
1 stop12h 05m
Thu 7/120:45 -
Nonstop7h 25m
Deal found 31/8£440
Mon 21/1206:20 -
1 stop15h 10m
Wed 20/118:30 -
1 stop11h 00m
Deal found 1/9£440
Mon 14/908:20 -
1 stop14h 26m
Sun 28/312:30 -
1 stop12h 50m
Deal found 1/9£441
Wed 30/915:50 -
Nonstop8h 25m
Wed 7/1022:05 -
Nonstop7h 35m
Deal found 31/8£443
Thu 17/1212:15 -
Nonstop8h 25m
Fri 1/118:05 -
Nonstop7h 10m
Deal found 1/9£444
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 2 September 2026.
Sat 12/909:40 -
2 stops20h 01m
Tue 30/318:30 -
2 stops14h 15m
Deal found 28/8£446
Wed 2/1216:25 -
Nonstop8h 30m
Sun 6/1218:05 -
Nonstop7h 10m
Deal found 29/8£457
Wed 2/1209:00 -
1 stop13h 00m
Sun 6/1222:15 -
Nonstop7h 35m
Deal found 1/9£496
Thu 1/1015:50 -
Nonstop8h 25m
Thu 8/1021:45 -
1 stop11h 00m
Deal found 31/8£509
Tue 29/1213:20 -
Nonstop8h 40m
Wed 13/118:55 -
Nonstop7h 25m
Deal found 29/8£522
Sun 7/219:50 -
2 stops26h 25m
Sat 13/220:30 -
2 stops19h 50m
Deal found 1/9£549
Fri 18/906:00 -
1 stop13h 00m
Fri 25/917:45 -
1 stop19h 55m
Deal found 1/9£566
Mon 26/1008:50 -
1 stop11h 55m
Fri 30/1022:45 -
Nonstop7h 15m
Deal found 30/8£492
Sun 27/1212:05 -
Nonstop8h 35m
Wed 13/118:20 -
Nonstop7h 20m
Deal found 29/8£525
Sat 12/909:30 -
2 stops16h 32m
Fri 26/318:25 -
1 stop14h 35m
Deal found 28/8£603
Wed 23/1219:50 -
2 stops26h 25m
Wed 6/120:30 -
2 stops14h 55m
Deal found 29/8£723
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 2 September 2026.
Sat 27/211:45 -
Nonstop8h 40m
Sat 6/318:55 -
Nonstop7h 25m
Deal found 31/8£437
Wed 21/1014:00 -
Nonstop8h 25m
Mon 26/1022:45 -
Nonstop7h 15m
Deal found 31/8£437
Tue 20/1017:05 -
Nonstop8h 15m
Sun 25/1022:45 -
Nonstop7h 15m
Deal found 1/9£439
Sun 1/1112:15 -
Nonstop8h 25m
Thu 5/1121:45 -
Nonstop7h 15m
Deal found 31/8£440
Wed 30/915:50 -
Nonstop8h 25m
Wed 7/1022:05 -
Nonstop7h 35m
Deal found 31/8£441
Thu 17/1212:15 -
Nonstop8h 25m
Fri 1/118:05 -
Nonstop7h 10m
Deal found 1/9£444
Thu 17/1212:15 -
Nonstop8h 25m
Wed 30/1221:55 -
Nonstop7h 15m
Deal found 1/9£445
Mon 28/915:50 -
Nonstop8h 25m
Tue 29/1218:55 -
Nonstop7h 25m
Deal found 31/8£446
Tue 16/212:15 -
Nonstop8h 25m
Fri 26/221:45 -
Nonstop7h 15m
Deal found 28/8£448
Tue 15/1212:15 -
Nonstop8h 25m
Sat 2/121:45 -
Nonstop7h 15m
Deal found 1/9£449
Tue 29/915:50 -
Nonstop8h 25m
Tue 6/1022:05 -
Nonstop7h 35m
Deal found 1/9£451
Last-minute flights from Heathrow to Dulles Intl
Discover last-minute flight deals from Heathrow to Dulles Intl. Data last updated 2 September 2026 and is based on user searches.
Thu 10/915:50 -
Nonstop8h 25m
Wed 23/922:05 -
Nonstop7h 35m
Deal found 1/9£431
Thu 10/915:50 -
Nonstop8h 25m
Fri 2/417:40 -
1 stop12h 05m
Deal found 1/9£444
Sat 12/916:20 -
1 stop24h 25m
Sun 28/310:05 -
1 stop15h 20m
Deal found 1/9£434
Sat 12/908:20 -
1 stop14h 26m
Thu 7/120:45 -
Nonstop7h 25m
Deal found 1/9£437
Sat 12/915:50 -
Nonstop8h 25m
Fri 2/407:00 -
2 stops18h 20m
Deal found 30/8£445
Mon 14/915:50 -
Nonstop8h 25m
Sat 3/406:10 -
1 stop20h 00m
Deal found 1/9£434
Mon 14/908:20 -
1 stop14h 26m
Sun 28/312:30 -
1 stop12h 50m
Deal found 1/9£441
Tue 29/908:55 -
1 stop12h 10m
Tue 6/1022:05 -
Nonstop7h 35m
Deal found 1/9£432
Wed 30/915:50 -
Nonstop8h 25m
Wed 7/1022:05 -
Nonstop7h 35m
Deal found 31/8£443
Sat 3/1015:50 -
Nonstop8h 25m
Fri 9/1017:30 -
1 stop22h 25m
Deal found 1/9£433
Tue 20/1017:05 -
Nonstop8h 15m
Sun 25/1022:45 -
Nonstop7h 15m
Deal found 1/9£439
Fri 30/1006:30 -
1 stop14h 25m
Wed 6/118:55 -
Nonstop7h 25m
Deal found 31/8£440
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 2 September 2026.
Sat 31/1007:30 -
1 stop13h 50m
Deal found 30/8£354
Wed 21/1014:00 -
Nonstop8h 25m
Deal found 29/8£355
Wed 28/1006:15 -
1 stop15h 05m
Deal found 30/8£355
Thu 22/1017:05 -
Nonstop8h 15m
Deal found 30/8£356
Wed 30/909:55 -
3 stops58h 50m
Deal found 30/8£358
Tue 24/1119:40 -
2 stops29h 55m
Deal found 28/8£358
Mon 30/1109:55 -
2 stops33h 50m
Deal found 28/8£359
Tue 1/1210:45 -
2 stops38h 50m
Deal found 31/8£360
Sun 29/1109:15 -
1 stop36h 05m
Deal found 28/8£361
Wed 25/1115:30 -
3 stops28h 45m
Deal found 28/8£361
Fri 22/112:15 -
Nonstop8h 25m
Deal found 1/9£362
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 2 September 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 2 September 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 12/9
09:40-00:41
2 stops20h 01m
Washington, D.C. Dulles Intl
Tue 30/3
18:30-13:45
2 stops14h 15m
£446
Fastest return journey
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Wed 2/12
16:25-19:55
Nonstop8h 30m
Washington, D.C. Dulles Intl
Sun 6/12
18:05-06:15
Nonstop7h 10m
£457
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Mon 26/10
08:50-16:45
1 stop11h 55m
Washington, D.C. Dulles Intl
Fri 30/10
22:45-10:00
Nonstop7h 15m
£492
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Wed 2/12
09:00-17:00
1 stop13h 00m
Washington, D.C. Dulles Intl
Sun 6/12
22:15-10:50
Nonstop7h 35m
£496
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Thu 1/10
15:50-19:15
Nonstop8h 25m
Washington, D.C. Dulles Intl
Thu 8/10
21:45-13:45
1 stop11h 00m
£509
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Tue 29/12
13:20-17:00
Nonstop8h 40m
Washington, D.C. Dulles Intl
Wed 13/1
18:55-07:20
Nonstop7h 25m
£522
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Sun 27/12
12:05-15:40
Nonstop8h 35m
Washington, D.C. Dulles Intl
Wed 13/1
18:20-06:40
Nonstop7h 20m
£525
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Sun 7/2
19:50-17:15
2 stops26h 25m
Washington, D.C. Dulles Intl
Sat 13/2
20:30-21:20
2 stops19h 50m
£549
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Fri 18/9
06:00-14:00
1 stop13h 00m
Washington, D.C. Dulles Intl
Fri 25/9
17:45-18:40
1 stop19h 55m
£566
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Sat 12/9
09:30-21:02
2 stops16h 32m
Washington, D.C. Dulles Intl
Fri 26/3
18:25-13:00
1 stop14h 35m
£603
Flights are sorted by cheapest return flights first.
Deals found on 29/8
Showing 1-10 of 21 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
Airlines
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 81 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 £465). Flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £581). 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 2 September 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 typical for this route at the moment.
London Heathrow Airport to Washington, D.C. Dulles Intl Airport flights typically cost between £420 and £541 in September.The cheapest return price found within the last 5 days was £431 on Delta (14 Sept–15 Apr).
Weekly flight availability from London Heathrow Airport to Washington, D.C. Dulles Intl Airport
Explore weekly flight availability from Heathrow to Dulles Intl. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 2 September 2026.
The most flights from LHR to IAD are scheduled on a Monday (29 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (24 on average).
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 early afternoon are less likely to be delayed, whereas flights leaving in the morning tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Monday 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 53% 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.
Reykjavik (KEF) is the most affordable one-stop option, with an average return flight price of £419.
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 2 September 2026.
Read reviews from past customers who have flown with United Airlines,Virgin Atlantic, andAer Lingus
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.
It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
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 Delta, British Airways, and United Airlines fly from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in about 8h 30m. The time it takes to get you to your destination can typically vary by up to 11h 31m. 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 £321, 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 Aer Lingus and TAP AIR PORTUGAL - these airlines can fly you to your destination from £374 and £380, 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 £312 on British Airways. Other airlines that offer cheap prices include Aer Lingus from £350 and United Airlines from £422 one-way.
What are the most reliable airlines from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?
Consider Air Canada (80%), Austrian Airlines (80%) or Copa Airlines (80%) 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 £1,391 for a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is £333 while the most popular route, (London Heathrow - Washington, D.C. Dulles Intl) is currently priced at £225.
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 £465). Flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £581). 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
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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 2 September 2026.
Explore flights to Dulles Intl departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 2 September 2026.
Browse through other flights departing from Heathrow. Flights are based on user searches made on Cheapflights and were last updated on 2 September 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 2 September 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.
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