Cheap flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from £248
This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 28/12. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — LHR
3 Nov — 10 Nov1
Return
1 adult
Economy
Return
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to London Heathrow are usually found in February or January, booked 71 days in advance, depart on a Tuesday or Sunday and return on a Friday
Cheap flight deals from Dulles Intl to Heathrow
Enter your travel dates to find the best prices.
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Best
Direct
Last-minute
One-way
Cheapest flights from Dulles Intl to Heathrow
Explore the most affordable flight options available from Dulles Intl to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 4 October 2026.
Mon 23/1119:40 -
1 stop10h 10m
Wed 2/1220:35 -
1 stop26h 55m
Deal found 30/9£521
Sat 12/1219:40 -
1 stop18h 50m
Sat 27/212:15 -
1 stop11h 15m
Deal found 29/9£522
Sat 12/1219:40 -
1 stop10h 10m
Mon 1/320:35 -
1 stop26h 55m
Deal found 29/9£522
Tue 3/1119:40 -
1 stop18h 50m
Fri 13/1112:15 -
1 stop11h 15m
Deal found 30/9£523
Sat 5/1220:30 -
2 stops19h 50m
Mon 7/1206:40 -
1 stop15h 35m
Deal found 30/9£524
Sun 11/1017:00 -
1 stop18h 20m
Tue 20/1009:15 -
1 stop14h 35m
Deal found 30/9£525
Sat 5/1220:30 -
2 stops19h 50m
Tue 8/1218:05 -
2 stops28h 10m
Deal found 29/9£526
Tue 24/1119:40 -
1 stop10h 10m
Tue 1/1220:35 -
1 stop26h 55m
Deal found 29/9£527
Tue 27/1018:25 -
1 stop24h 15m
Tue 17/1106:00 -
1 stop13h 40m
Deal found 29/9£528
Thu 5/1120:30 -
2 stops59h 25m
Mon 9/1110:20 -
1 stop11h 55m
Deal found 2/10£528
Sun 18/1020:20 -
1 stop16h 20m
Fri 23/1018:40 -
1 stop27h 20m
Deal found 2/10£530
Mon 16/1117:25 -
1 stop14h 15m
Wed 25/1118:30 -
1 stop25h 45m
Deal found 29/9£531
Best flights from Dulles Intl to Heathrow
Discover carefully curated flight deals from Dulles Intl to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 4 October 2026.
Wed 13/122:30 -
1 stop19h 10m
Tue 19/106:00 -
1 stop13h 40m
Deal found 2/10£550
Wed 3/220:30 -
2 stops20h 05m
Sun 7/218:40 -
1 stop27h 35m
Deal found 3/10£578
Thu 11/220:10 -
1 stop15h 10m
Sat 13/212:05 -
Nonstop8h 35m
Deal found 29/9£646
Wed 4/1118:20 -
Nonstop7h 20m
Mon 9/1117:10 -
1 stop28h 50m
Deal found 1/10£661
Sun 10/118:05 -
Nonstop7h 10m
Thu 21/112:15 -
Nonstop8h 25m
Deal found 3/10£673
Sun 1/1121:30 -
1 stop11h 15m
Sun 8/1113:05 -
Nonstop8h 40m
Deal found 3/10£721
Wed 28/1021:30 -
2 stops14h 55m
Wed 4/1117:30 -
2 stops28h 45m
Deal found 4/10£581
Mon 9/1118:20 -
Nonstop7h 20m
Tue 17/1109:00 -
1 stop13h 00m
Deal found 2/10£693
Fri 11/1218:20 -
Nonstop7h 20m
Thu 24/1209:00 -
1 stop13h 00m
Deal found 3/10£695
Fri 23/1020:20 -
1 stop14h 40m
Mon 2/1107:05 -
2 stops15h 10m
Deal found 30/9£723
Tue 3/1122:15 -
Nonstop7h 35m
Sat 14/1109:00 -
1 stop13h 00m
Deal found 3/10£695
Wed 18/1120:30 -
2 stops15h 30m
Mon 30/1107:05 -
2 stops15h 10m
Deal found 4/10£723
Direct flights from Dulles Intl to Heathrow
Explore direct flight options from Dulles Intl to Heathrow based on user searches, and compare prices and availability for your desired travel dates. Data last updated 4 October 2026.
Wed 28/1022:55 -
Nonstop7h 15m
Thu 5/1116:25 -
Nonstop8h 30m
Deal found 30/9£553
Sat 12/1218:05 -
Nonstop7h 10m
Tue 2/312:15 -
Nonstop8h 25m
Deal found 1/10£597
Mon 14/1218:05 -
Nonstop7h 10m
Tue 2/312:15 -
Nonstop8h 25m
Deal found 1/10£599
Fri 11/1221:45 -
Nonstop7h 15m
Fri 18/1212:15 -
Nonstop8h 25m
Deal found 1/10£599
Wed 25/1121:55 -
Nonstop7h 15m
Tue 1/1212:15 -
Nonstop8h 25m
Deal found 3/10£605
Sun 13/1221:45 -
Nonstop7h 15m
Wed 3/312:15 -
Nonstop8h 25m
Deal found 1/10£608
Sat 28/1118:05 -
Nonstop7h 10m
Tue 1/1216:25 -
Nonstop8h 30m
Deal found 3/10£609
Sun 31/118:55 -
Nonstop7h 25m
Sun 7/212:15 -
Nonstop8h 25m
Deal found 3/10£609
Sat 12/1218:05 -
Nonstop7h 10m
Sun 28/212:15 -
Nonstop8h 25m
Deal found 1/10£610
Tue 5/118:05 -
Nonstop7h 10m
Tue 12/116:25 -
Nonstop8h 30m
Deal found 3/10£611
Wed 13/121:55 -
Nonstop7h 15m
Wed 20/112:15 -
Nonstop8h 25m
Deal found 30/9£612
Sat 12/1218:05 -
Nonstop7h 10m
Fri 5/316:25 -
Nonstop8h 30m
Deal found 1/10£612
Last-minute flights from Dulles Intl to Heathrow
Discover last-minute flight deals from Dulles Intl to Heathrow. Data last updated 4 October 2026 and is based on user searches.
Sun 11/1017:00 -
1 stop18h 20m
Tue 20/1009:15 -
1 stop14h 35m
Deal found 30/9£525
Sun 18/1020:20 -
1 stop16h 20m
Fri 23/1018:40 -
1 stop27h 20m
Deal found 2/10£530
Sat 24/1020:20 -
2 stops33h 15m
Mon 26/1021:05 -
2 stops49h 10m
Deal found 30/9£532
Tue 27/1018:25 -
1 stop24h 15m
Tue 17/1106:00 -
1 stop13h 40m
Deal found 29/9£528
Mon 2/1120:30 -
2 stops19h 50m
Tue 10/1113:55 -
2 stops32h 20m
Deal found 4/10£534
Tue 3/1118:00 -
3 stops23h 40m
Tue 10/1120:50 -
3 stops28h 33m
Deal found 2/10£522
Tue 3/1119:40 -
1 stop18h 50m
Fri 13/1112:15 -
1 stop11h 15m
Deal found 30/9£523
Tue 3/1119:40 -
1 stop10h 10m
Thu 12/1120:35 -
1 stop26h 55m
Deal found 30/9£524
Thu 5/1120:30 -
2 stops59h 25m
Mon 9/1110:20 -
1 stop11h 55m
Deal found 2/10£528
Mon 16/1117:25 -
1 stop14h 15m
Wed 25/1118:30 -
1 stop25h 45m
Deal found 29/9£531
Mon 23/1119:40 -
1 stop10h 10m
Wed 2/1220:35 -
1 stop26h 55m
Deal found 30/9£521
Tue 24/1119:40 -
1 stop10h 10m
Tue 1/1220:35 -
1 stop26h 55m
Deal found 29/9£527
One-way flights from Dulles Intl to Heathrow
Search for one-way flight options from Dulles Intl to Heathrow. Find affordable one-way fares based on user searches. Data last updated 4 October 2026.
Mon 28/1222:44 -
1 stop16h 51m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 29/9£248
Mon 14/1219:40 -
1 stop18h 50m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 30/9£249
Sun 8/1119:40 -
2 stops15h 45m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 29/9£250
Tue 1/1219:40 -
2 stops21h 00m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 29/9£251
Mon 28/1222:09 -
2 stops41h 51m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 29/9£251
Mon 30/1119:40 -
1 stop18h 50m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 3/10£252
Sat 5/1219:40 -
1 stop10h 10m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 3/10£253
Sat 6/316:30 -
2 stops33h 40m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 30/9£254
Wed 30/1208:15 -
2 stops22h 05m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 29/9£254
Fri 2/423:20 -
1 stop31h 35m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 1/10£255
Sat 31/1020:40 -
2 stops32h 55m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 30/9£256
Sun 6/1222:30 -
2 stops30h 05m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 2/10£257
Find flight deals from Dulles Intl to Heathrow
Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to Heathrow (LHR). 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 4 October 2026.
Customise your flight search to find flights from Dulles Intl to Heathrow 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 4 October 2026.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
Cheapest return flight
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Sat 6/3
17:15-05:55
1 stop31h 40m
London Heathrow
Wed 31/12
00:00-18:00
Nonstop0h 00m
£257
Fastest return journey
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Fri 1/1
18:05-06:15
Nonstop7h 10m
London Heathrow
Wed 31/12
00:00-18:00
Nonstop0h 00m
£283
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Fri 5/2
19:30-07:55
Nonstop7h 25m
London Heathrow
Wed 31/12
00:00-18:00
Nonstop0h 00m
£283
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Fri 1/1
18:20-06:40
Nonstop7h 20m
London Heathrow
Wed 31/12
00:00-18:00
Nonstop0h 00m
£283
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Thu 31/12
18:05-06:15
Nonstop7h 10m
London Heathrow
Wed 31/12
00:00-18:00
Nonstop0h 00m
£283
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Sat 2/1
18:10-08:20
1 stop33h 10m
London Heathrow
Wed 31/12
00:00-18:00
Nonstop0h 00m
£304
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Sun 8/11
18:55-07:20
Nonstop7h 25m
London Heathrow
Wed 31/12
00:00-18:00
Nonstop0h 00m
£347
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Sun 8/11
22:15-10:50
Nonstop7h 35m
London Heathrow
Wed 31/12
00:00-18:00
Nonstop0h 00m
£347
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Mon 2/11
18:20-06:40
Nonstop7h 20m
London Heathrow
Wed 31/12
00:00-18:00
Nonstop0h 00m
£350
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Tue 29/12
18:20-06:40
Nonstop7h 20m
London Heathrow
Wed 31/12
00:00-18:00
Nonstop0h 00m
£369
Flights are sorted by cheapest return flights first.
Deals found on 30/9
Showing 1-10 of 23 resultsSorted by cheapest first
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Best time to book a flight from Dulles Intl to Heathrow
Have a flexible travel schedule? Discover the best time to fly to Heathrow from Dulles Intl with our price prediction graph.
IAD-LHR
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 Washington, D.C. Dulles Intl Airport to London Heathrow Airport
Prices
Airlines
Delays
More
How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
The price you pay for your flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport may vary depending on when you book. For the best chance of a lower fare, look to book 70 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
Currently, February is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport (average of £529). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of £985). 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 IAD to LHR?
Find hourly flight availability from Dulles Intl to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 4 October 2026.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport as you normally would.
How much does it cost for a return flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
Airfare is below average for this route at the moment.
Washington, D.C. Dulles Intl Airport to London Heathrow Airport flights typically cost between £568 and £753 in November.The cheapest return price found within the last 5 days was £521 on Icelandair (23 Nov–2 Dec).
Weekly flight availability from Washington, D.C. Dulles Intl Airport to London Heathrow Airport
Explore weekly flight availability from Dulles Intl to Heathrow. 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 4 October 2026.
The most flights from IAD to LHR are scheduled on a Monday (31 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (28 on average).
How often are flights from Washington, D.C. to London delayed?
About 18% of weekly flights between Washington, D.C. and London have experienced delays in the past year, with the average delay time being 174 minutes.
What is the most punctual flight time for Washington, D.C. to London 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 Washington, D.C. to London flights?
Over the past year, Virgin Atlantic have had the lowest number of delays on this route, with just 13% of flights being delayed.
What’s the top stopover airport for flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
Share of one-stop return flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport chosen by Cheapflights users in the past 12 months, using the same stopover each way.
Dublin (DUB) – chosen by Cheapflights users on 33% of one-stop itineraries from Washington, D.C. Dulles Intl Airport to London Heathrow Airport on Cheapflights.
What’s the cheapest stopover airport for flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
Average return fare for one-stop flights from Washington, D.C. Dulles Intl Airport to London Heathrow 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 £669.
What’s the fastest stopover option from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
Shortest average travel time for one-stop one-way flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.
Flights via Dublin (DUB) have the shortest average one-way travel time for one-stop routes: 9h 42m.
Which airport typically offers the quickest stopover for flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
Average stopover duration for one-stop one-way flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Reykjavik (KEF) offer the fastest connection on this route, with an average stopover time of 1h 20m.
Reviews of airlines servicing Heathrow
Get insights into the airlines that provide service to Heathrow. 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 Heathrow. Reviews last updated 4 October 2026.
Check out reviews from past customers who have flown with Delta,United Airlines, andVirgin Atlantic from Washington, D.C. Dulles Intl Airport to London Heathrow Airport to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
The flight crew was 30 minutes late to an am flight and then that caused a delay
Related info for your journey
Find useful and relevant information for your journey from Dulles Intl to Heathrow. 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 Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
There are many flights that can get you from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in 15h 10m. Fly via TAP AIR PORTUGAL, Scandinavian Airlines, or United Airlines to get the fastest option. Airlines will cover a distance of 3664 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport round-trip?
Currently priced at £435, British Airways will fly you from Washington, D.C. Dulles Intl Airport to London Heathrow Airport and back. In addition to British Airways, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Virgin Atlantic and Icelandair - these airlines can fly you to your destination from £456 and £498, respectively. You may be able to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport for 36% less than the average price by searching for these airlines.
What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport one-way?
For one-way options, check prices for Virgin Atlantic. According to our data, you can fly for as low as £216. Users have also found prices from £246 and £298 on British Airways and United Airlines, respectively.
What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
Before booking your flight to London Heathrow Airport from Washington, D.C. Dulles Intl Airport, check out the most reliable airlines to get you to your destination on time: Iberia (83%), Aer Lingus (75%), KLM( 73%).
What are the cheapest flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
On average you can expect to pay £567 for a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport. The cheapest flight overall is £268 while the most popular route, (Washington, D.C. Dulles Intl - London Heathrow) is currently priced at £461.
Can I find deals for business class flights from Dulles Intl to Heathrow?
Yes. Cheapflights offers flight deals from Dulles Intl to Heathrow 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 Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
Currently, February is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport (average of £529). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of £985). 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.
Explore flights to Heathrow departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 4 October 2026.
Top 5 airlines flying from Dulles Intl to Heathrow
Discover the top 5 airlines that operate flights from Dulles Intl to Heathrow. 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 4 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 Dulles Intl to Heathrow?
Deals for Dulles Intl to Heathrow flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.
Why should you use Cheapflights to find cheap flight tickets from Dulles Intl to Heathrow?
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 Dulles Intl to Heathrow.
Can Cheapflights find flights from Dulles Intl to Heathrow with no change fees?
Need flexible booking options for your flight to Heathrow from Dulles Intl? 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 Dulles Intl to Heathrow become cheaper?
Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!
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