Cheap flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from £280
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 30/12. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — LHR
17 Jan — 24 Jan1
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 August or September, booked 45 days in advance, depart on a Wednesday or Tuesday and return on a Thursday
Cheap flight deals from Dulles Intl to Heathrow
Enter your travel dates to find the best prices.
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 18 December 2025.
Tue 30/1219:40IAD - LHR
1 stop10h 10mIcelandair
Tue 13/112:15LHR - IAD
1 stop11h 15mIcelandair
Deal found 18/12£436
Wed 31/1217:25IAD - LHR
1 stop17h 55mSWISS
Wed 14/106:00LHR - IAD
1 stop14h 30mSWISS
Deal found 16/12£439
Wed 31/1222:15IAD - LHR
Nonstop7h 35mUnited Airlines
Wed 14/106:50LHR - IAD
1 stop12h 45mUnited Airlines
Deal found 17/12£453
Wed 31/1217:10IAD - LHR
1 stop11h 10mAir Canada
Wed 14/106:50LHR - IAD
2 stops14h 34mAir Canada
Deal found 18/12£455
Tue 30/1219:40IAD - LHR
1 stop10h 10mIcelandair
Sat 24/112:15LHR - IAD
1 stop11h 15mIcelandair
Deal found 17/12£457
Wed 31/1222:20IAD - LHR
Nonstop7h 30mDelta
Wed 14/108:55LHR - IAD
1 stop12h 40mDelta
Deal found 16/12£458
Wed 31/1209:45IAD - LHR
2 stops15h 45mMultiple Airlines
Wed 14/106:50LHR - IAD
2 stops14h 34mMultiple Airlines
Deal found 18/12£463
Wed 31/1217:05IAD - LHR
1 stop11h 00mAer Lingus
Wed 14/107:50LHR - IAD
1 stop12h 45mAer Lingus
Deal found 18/12£464
Wed 31/1217:31IAD - LHR
1 stop12h 44mAustrian Airlines
Sat 24/106:00LHR - IAD
1 stop13h 40mAustrian Airlines
Deal found 17/12£468
Tue 30/1217:31IAD - LHR
1 stop31h 24mMultiple Airlines
Tue 13/109:00LHR - IAD
1 stop12h 40mMultiple Airlines
Deal found 17/12£471
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 18 December 2025.
Sat 24/120:30IAD - LHR
2 stops17h 20mScandinavian Airlines
Tue 3/221:05LHR - IAD
2 stops25h 10mScandinavian Airlines
Deal found 17/12£436
Wed 4/322:15IAD - LHR
Nonstop7h 35mUnited Airlines
Mon 9/306:50LHR - IAD
1 stop12h 45mUnited Airlines
Deal found 17/12£459
Sun 1/318:20IAD - LHR
Nonstop7h 20mUnited Airlines
Mon 9/306:50LHR - IAD
1 stop12h 45mUnited Airlines
Deal found 17/12£459
Tue 17/323:15IAD - LHR
Nonstop7h 35mUnited Airlines
Tue 24/309:00LHR - IAD
1 stop12h 40mUnited Airlines
Deal found 16/12£459
Sat 28/222:15IAD - LHR
Nonstop7h 35mUnited Airlines
Sun 8/309:00LHR - IAD
1 stop12h 40mUnited Airlines
Deal found 17/12£459
Wed 7/118:20IAD - LHR
Nonstop7h 20mUnited Airlines
Tue 13/109:00LHR - IAD
1 stop12h 40mUnited Airlines
Deal found 16/12£459
Sun 15/218:20IAD - LHR
Nonstop7h 20mUnited Airlines
Mon 23/206:50LHR - IAD
1 stop12h 45mUnited Airlines
Deal found 17/12£459
Fri 16/122:15IAD - LHR
Nonstop7h 35mUnited Airlines
Sun 1/209:00LHR - IAD
1 stop12h 40mUnited Airlines
Deal found 17/12£459
Thu 12/218:20IAD - LHR
Nonstop7h 20mUnited Airlines
Sun 15/206:50LHR - IAD
1 stop12h 45mUnited Airlines
Deal found 16/12£459
Wed 21/118:05IAD - LHR
Nonstop7h 35mUnited Airlines
Tue 27/106:50LHR - IAD
1 stop12h 45mUnited Airlines
Deal found 17/12£459
Fri 20/222:15IAD - LHR
Nonstop7h 35mUnited Airlines
Wed 25/206:50LHR - IAD
1 stop12h 45mUnited Airlines
Deal found 17/12£459
Wed 18/319:20IAD - LHR
Nonstop7h 20mUnited Airlines
Mon 23/311:10LHR - IAD
1 stop13h 55mUnited Airlines
Deal found 16/12£459
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 18 December 2025.
Thu 22/122:20IAD - LHR
Nonstop7h 30mVirgin Atlantic
Thu 29/116:50LHR - IAD
Nonstop8h 40mVirgin Atlantic
Deal found 17/12£458
Tue 13/122:20IAD - LHR
Nonstop7h 30mVirgin Atlantic
Tue 20/116:50LHR - IAD
Nonstop8h 40mVirgin Atlantic
Deal found 17/12£459
Sat 31/122:20IAD - LHR
Nonstop7h 30mVirgin Atlantic
Sat 7/216:50LHR - IAD
Nonstop8h 40mVirgin Atlantic
Deal found 17/12£462
Tue 10/319:20IAD - LHR
Nonstop7h 10mBritish Airways
Tue 17/312:10LHR - IAD
Nonstop8h 25mBritish Airways
Deal found 17/12£464
Sun 11/122:20IAD - LHR
Nonstop7h 30mVirgin Atlantic
Tue 20/116:50LHR - IAD
Nonstop8h 40mVirgin Atlantic
Deal found 18/12£467
Sun 8/222:20IAD - LHR
Nonstop7h 30mVirgin Atlantic
Tue 24/216:50LHR - IAD
Nonstop8h 40mVirgin Atlantic
Deal found 17/12£467
Fri 16/118:20IAD - LHR
Nonstop7h 10mBritish Airways
Tue 20/112:10LHR - IAD
Nonstop8h 25mBritish Airways
Deal found 17/12£470
Tue 17/218:20IAD - LHR
Nonstop7h 10mFinnair
Sun 22/212:10LHR - IAD
Nonstop8h 25mFinnair
Deal found 16/12£471
Sun 25/118:20IAD - LHR
Nonstop7h 10mFinnair
Tue 3/216:25LHR - IAD
Nonstop8h 30mFinnair
Deal found 16/12£472
Wed 31/1222:20IAD - LHR
Nonstop7h 30mKLM
Wed 14/116:50LHR - IAD
Nonstop8h 40mKLM
Deal found 16/12£474
Last-minute flights from Dulles Intl to Heathrow
Discover last-minute flight deals from Dulles Intl to Heathrow. Data last updated 18 December 2025 and is based on user searches.
Wed 31/1217:25IAD - LHR
1 stop19h 25mSWISS
Wed 14/120:05LHR - IAD
1 stop24h 25mSWISS
Deal found 17/12£439
Mon 5/119:40IAD - LHR
1 stop10h 10mIcelandair
Mon 12/120:35LHR - IAD
1 stop26h 55mIcelandair
Deal found 17/12£434
Wed 7/119:40IAD - LHR
1 stop10h 10mIcelandair
Sat 24/112:15LHR - IAD
1 stop11h 15mIcelandair
Deal found 17/12£434
Wed 7/117:17IAD - LHR
1 stop12h 58mMultiple Airlines
Wed 14/120:05LHR - IAD
2 stops22h 55mMultiple Airlines
Deal found 16/12£442
Fri 9/119:40IAD - LHR
1 stop18h 50mIcelandair
Mon 19/120:35LHR - IAD
1 stop26h 55mIcelandair
Deal found 16/12£440
Mon 12/120:30IAD - LHR
2 stops17h 20mScandinavian Airlines
Sat 17/106:40LHR - IAD
2 stops17h 10mScandinavian Airlines
Deal found 16/12£438
Mon 12/120:30IAD - LHR
2 stops38h 55mScandinavian Airlines
Thu 15/110:20LHR - IAD
2 stops37h 49mScandinavian Airlines
Deal found 15/12£441
Wed 14/117:25IAD - LHR
1 stop14h 35mSWISS
Sun 18/106:00LHR - IAD
1 stop14h 10mSWISS
Deal found 17/12£437
Thu 15/120:30IAD - LHR
1 stop11h 30mSWISS
Thu 22/120:05LHR - IAD
1 stop25h 35mSWISS
Deal found 18/12£437
Fri 16/117:17IAD - LHR
1 stop12h 58mMultiple Airlines
Tue 20/108:30LHR - IAD
1 stop12h 20mMultiple Airlines
Deal found 17/12£435
Thu 29/120:30IAD - LHR
2 stops14h 55mScandinavian Airlines
Sun 1/221:05LHR - IAD
2 stops25h 10mScandinavian Airlines
Deal found 18/12£433
Thu 29/120:30IAD - LHR
2 stops14h 55mScandinavian Airlines
Tue 3/221:05LHR - IAD
2 stops25h 10mScandinavian Airlines
Deal found 17/12£436
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 18 December 2025.
Tue 30/1219:40IAD - LHR
1 stop10h 10mIcelandair
Deal found 16/12£280
Tue 27/109:45IAD - LHR
1 stop16h 25mAir Canada
Deal found 16/12£281
Wed 28/109:00IAD - LHR
2 stops17h 10mAir Canada
Deal found 16/12£282
Mon 16/222:15IAD - LHR
Nonstop7h 35mAustrian Airlines
Deal found 16/12£283
Sun 1/222:20IAD - LHR
Nonstop7h 30mVirgin Atlantic
Deal found 17/12£283
Tue 6/119:40IAD - LHR
1 stop18h 50mIcelandair
Deal found 17/12£285
Sat 21/217:30IAD - LHR
2 stops16h 35mMultiple Airlines
Deal found 18/12£286
Tue 17/212:23IAD - LHR
2 stops28h 17mScandinavian Airlines
Deal found 18/12£286
Tue 27/118:20IAD - LHR
Nonstop7h 20mAustrian Airlines
Deal found 16/12£287
Tue 27/112:23IAD - LHR
2 stops14h 27mDelta
Deal found 17/12£288
Wed 31/1212:40IAD - LHR
1 stop12h 40mUnited Airlines
Deal found 16/12£289
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 18 December 2025.
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 858,174 searches. Data last updated 18 December 2025.
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
Dulles Intl
Fly to
Heathrow
Route
Depart
Return
Price
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Sat 24/1
20:30-18:50
2 stops17h 20m
London Heathrow
Tue 3/2
21:05-17:15
2 stops25h 10m
£436
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Wed 4/3
22:15-10:50
Nonstop7h 35m
London Heathrow
Mon 9/3
06:50-15:35
1 stop12h 45m
£459
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Sun 1/3
18:20-06:40
Nonstop7h 20m
London Heathrow
Mon 9/3
06:50-15:35
1 stop12h 45m
£459
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Tue 17/3
23:15-10:50
Nonstop7h 35m
London Heathrow
Tue 24/3
09:00-17:40
1 stop12h 40m
£459
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Sat 28/2
22:15-10:50
Nonstop7h 35m
London Heathrow
Sun 8/3
09:00-17:40
1 stop12h 40m
£459
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Wed 7/1
18:20-06:40
Nonstop7h 20m
London Heathrow
Tue 13/1
09:00-16:40
1 stop12h 40m
£459
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Sun 15/2
18:20-06:40
Nonstop7h 20m
London Heathrow
Mon 23/2
06:50-14:35
1 stop12h 45m
£459
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Fri 16/1
22:15-10:50
Nonstop7h 35m
London Heathrow
Sun 1/2
09:00-16:40
1 stop12h 40m
£459
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Thu 12/2
18:20-06:40
Nonstop7h 20m
London Heathrow
Sun 15/2
06:50-14:35
1 stop12h 45m
£459
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Wed 21/1
18:05-06:40
Nonstop7h 35m
London Heathrow
Tue 27/1
06:50-14:35
1 stop12h 45m
£459
Flights are sorted by cheapest return flights first.
Deals found on 17/12
Showing 1-10 of 24 results
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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.
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?
Use this chart to determine the optimal time to book a return flight from Dulles Intl to Heathrow. Price data was last updated on 12 December 2025.
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 45 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, August is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport (average of £325). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of £557). 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 18 December 2025.
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?
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 18 December 2025.
The most flights from IAD to LHR are scheduled on a Monday (26 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (22 on average).
How often are flights from Washington, D.C. to London delayed?
About 21% of weekly flights between Washington, D.C. and London have experienced delays in the past year, with the average delay time being 159 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 Saturday 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 15% 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.
Reykjavik (KEF) – chosen by Cheapflights users on 57% 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 £335.
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 25m.
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 Dublin (DUB) offer the fastest connection on this route, with an average stopover time of 1h 35m.
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 18 December 2025.
Check out reviews from past customers who have flown with Virgin Atlantic, United Airlines, andIberia 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 is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
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 7h 35m. Fly via 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 £310, Lufthansa will fly you from Washington, D.C. Dulles Intl Airport to London Heathrow Airport and back. In addition to Lufthansa, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Icelandair and Virgin Atlantic - these airlines can fly you to your destination from £369 and £383, respectively. You may be able to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport for 44% 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 TAP AIR PORTUGAL. According to our data, you can fly for as low as £160. Users have also found prices from £263 and £267 on Virgin Atlantic and British Airways, 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: KLM (95%), Air France (92%), Delta( 92%).
What are the cheapest flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
On average you can expect to pay £545 for a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport. The cheapest flight overall is £287 while the most popular route, (Washington, D.C. Dulles Intl - London Heathrow) is currently priced at £313.
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, August is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport (average of £325). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of £557). 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 18 December 2025.
Top 7 airlines flying from Dulles Intl to Heathrow
Discover the top 7 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 858,174 searches. Data last updated 18 December 2025.
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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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.
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