$480+ Cheap flights from Heathrow (LHR) to Dulles Intl (IAD)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/21. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — IAD
Oct 10 — Oct 171
Round-trip
1 adult, Economy
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Find cheap flights from Heathrow to Dulles Intl with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from London Heathrow to Washington, D.C. Dulles Intl are usually found in February or March, booked 82 days in advance, depart on a Wednesday or Thursday and return on a Wednesday
Cheap flight deals from Heathrow to Dulles Intl
Cheapest
Best
Last-minute
One-way
Cheapest flights from Heathrow to Dulles IntlExplore 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 September 10, 2026.
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 September 10, 2026.
This oojo deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/158:40 am -
1 stop11h 55m
Sun 10/186:05 am -
1 stop20h 05m
Deal found 9/9![Virgin Atlantic logo]()
$565
This BYOjet deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure BYOjet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/137:45 pm -
2 stops26h 25m
Wed 10/216:05 am -
1 stop20h 05m
Deal found 9/9![Virgin Atlantic logo]()
$566
This Gotogate deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/73:50 pm -
Nonstop8h 25m
Wed 10/1410:05 pm -
Nonstop7h 35m
Deal found 9/9![Virgin Atlantic logo]()
$567
This Iberia deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/76:15 am -
1 stop14h 15m
Wed 10/147:13 pm -
1 stop14h 12m
Deal found 9/9![Iberia logo]()
$568
This Delta deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/16:30 am -
1 stop14h 05m
Mon 10/511:44 am -
1 stop20h 21m
Deal found 9/9![Delta logo]()
$569
This Delta deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/166:15 am -
1 stop18h 20m
Tue 10/206:00 am -
1 stop19h 25m
Deal found 9/9![Delta logo]()
$570
This Booking.com deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/13:50 pm -
Nonstop8h 25m
Mon 10/510:05 pm -
Nonstop7h 35m
Deal found 9/9![Virgin Atlantic logo]()
$571
This BYOjet deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure BYOjet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/176:30 am -
1 stop14h 05m
Sun 9/207:34 pm -
2 stops15h 41m
Deal found 9/8![Virgin Atlantic logo]()
$573
This Delta deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/179:55 am -
1 stop10h 40m
Sat 10/312:18 pm -
1 stop13h 52m
Deal found 9/8![Delta logo]()
$574
This Booking.com deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/133:50 pm -
Nonstop8h 25m
Wed 10/2110:05 pm -
Nonstop7h 35m
Deal found 9/9![Air France logo]()
$577
Best flights from Heathrow to Dulles IntlDiscover carefully curated flight deals from Heathrow to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 10, 2026.
Discover carefully curated flight deals from Heathrow to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 10, 2026.
This Delta deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/208:40 am -
1 stop11h 55m
Sun 11/19:30 pm -
1 stop11h 15m
Deal found 9/9![Delta logo]()
$579
This KLM deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/103:50 pm -
Nonstop8h 25m
Sat 1/306:55 pm -
Nonstop7h 25m
Deal found 9/7![KLM logo]()
$580
This Virgin Atlantic deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/303:50 pm -
Nonstop8h 25m
Wed 10/710:20 pm -
1 stop15h 15m
Deal found 9/8![Virgin Atlantic logo]()
$597
This British Airways deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/24:25 pm -
Nonstop8h 30m
Sun 12/66:05 pm -
Nonstop7h 10m
Deal found 9/9![British Airways logo]()
$605
This United Airlines deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/238:40 am -
1 stop13h 05m
Fri 10/309:10 pm -
1 stop30h 55m
Deal found 9/8![United Airlines logo]()
$629
This Lufthansa deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/114:20 pm -
Nonstop8h 55m
Wed 11/256:20 pm -
Nonstop7h 20m
Deal found 9/8![Multiple Airlines logo]()
$668
This Delta deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/21:20 pm -
Nonstop8h 40m
Wed 11/116:55 pm -
Nonstop7h 25m
Deal found 9/5![Delta logo]()
$581
This United Airlines deal was found by Cheapflights users on 9/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/187:30 am -
1 stop12h 05m
Wed 12/28:15 am -
2 stops17h 55m
Deal found 9/6![United Airlines logo]()
$639
This Delta deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/133:50 pm -
Nonstop8h 25m
Sun 10/1810:05 pm -
Nonstop7h 35m
Deal found 9/8![Delta logo]()
$581
This United Airlines deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/149:30 am -
1 stop11h 25m
Wed 11/1812:37 pm -
2 stops13h 33m
Deal found 9/5![United Airlines logo]()
$639
This Delta deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/213:50 pm -
Nonstop8h 25m
Mon 4/264:00 pm -
1 stop14h 20m
Deal found 9/9![Delta logo]()
$582
This Delta deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/164:20 pm -
1 stop30h 13m
Sun 11/16:00 am -
1 stop22h 00m
Deal found 9/7![Delta logo]()
$586
Last-minute flights from Heathrow to Dulles IntlDiscover last-minute flight deals from Heathrow to Dulles Intl. Data last updated September 10, 2026 and is based on user searches.
Discover last-minute flight deals from Heathrow to Dulles Intl. Data last updated September 10, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/166:15 am -
1 stop18h 20m
Tue 10/206:00 am -
1 stop19h 25m
Deal found 9/9![Delta logo]()
$570
This BYOjet deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure BYOjet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/176:30 am -
1 stop14h 05m
Sun 9/207:34 pm -
2 stops15h 41m
Deal found 9/8![Virgin Atlantic logo]()
$573
This Delta deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/179:55 am -
1 stop10h 40m
Sat 10/312:18 pm -
1 stop13h 52m
Deal found 9/8![Delta logo]()
$574
This Delta deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/16:30 am -
1 stop14h 05m
Mon 10/511:44 am -
1 stop20h 21m
Deal found 9/9![Delta logo]()
$569
This Booking.com deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/13:50 pm -
Nonstop8h 25m
Mon 10/510:05 pm -
Nonstop7h 35m
Deal found 9/9![Virgin Atlantic logo]()
$571
This Gotogate deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/73:50 pm -
Nonstop8h 25m
Wed 10/1410:05 pm -
Nonstop7h 35m
Deal found 9/9![Virgin Atlantic logo]()
$567
This Iberia deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/76:15 am -
1 stop14h 15m
Wed 10/147:13 pm -
1 stop14h 12m
Deal found 9/9![Iberia logo]()
$568
This BYOjet deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure BYOjet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/137:45 pm -
2 stops26h 25m
Wed 10/216:05 am -
1 stop20h 05m
Deal found 9/9![Virgin Atlantic logo]()
$566
This Booking.com deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/133:50 pm -
Nonstop8h 25m
Wed 10/2110:05 pm -
Nonstop7h 35m
Deal found 9/9![Air France logo]()
$577
This oojo deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/158:40 am -
1 stop11h 55m
Sun 10/186:05 am -
1 stop20h 05m
Deal found 9/9![Virgin Atlantic logo]()
$565
One-way flights from Heathrow to Dulles IntlSearch for one-way flight options from Heathrow to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated September 10, 2026.
Search for one-way flight options from Heathrow to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated September 10, 2026.
This Iberia deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/214:25 pm -
Nonstop8h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![Iberia logo]()
$480
This Mytrip deal was found by Cheapflights users on 9/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/89:25 pm -
1 stop26h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/6![Icelandair logo]()
$481
This Kiwi.com deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/78:50 pm -
3 stops24h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![Multiple Airlines logo]()
$482
This Gurufare deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/77:30 am -
2 stops18h 24m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![British Airways logo]()
$484
This British Airways deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/411:45 am -
1 stop12h 02m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![British Airways logo]()
$485
This Kiwi.com deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/98:50 pm -
3 stops24h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Multiple Airlines logo]()
$486
This Kiwi.com deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/67:40 pm -
2 stops29h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![Multiple Airlines logo]()
$487
This Kiwi.com deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/23:30 pm -
3 stops28h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![Multiple Airlines logo]()
$488
This British Airways deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/184:25 pm -
Nonstop8h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![British Airways logo]()
$489
This American Airlines deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/66:15 am -
2 stops18h 22m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![American Airlines logo]()
$490
This Gotogate deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/69:25 pm -
1 stop29h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![Icelandair logo]()
$491
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 September 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $565 (oojo) |
One-way from | $480 (Iberia) |
Popular in | July |
Cheapest in | February |
Average price | $664 |
Good round-trip deal | $633 or less |
Good one-way deal | $539 or less |
Cheapflights Fare Finder
Customize 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 September 10, 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
Cheapest round-trip
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Fri 3/5
6:45 pm-4:20 pm
1 stop26h 35m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-6:00 am
Nonstop0h 00m
$487
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Thu 11/5
5:25 pm-4:20 pm
1 stop27h 55m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-6:00 am
Nonstop0h 00m
$487
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Fri 12/4
4:25 pm-7:55 pm
Nonstop8h 30m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-6:00 am
Nonstop0h 00m
$496
Quickest round-trip
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Sun 11/8
12:15 pm-3:40 pm
Nonstop8h 25m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-6:00 am
Nonstop0h 00m
$496
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Sun 12/6
4:25 pm-7:55 pm
Nonstop8h 30m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-6:00 am
Nonstop0h 00m
$496
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Mon 11/2
4:25 pm-7:55 pm
Nonstop8h 30m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-6:00 am
Nonstop0h 00m
$496
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Wed 11/4
12:15 pm-3:40 pm
Nonstop8h 25m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-6:00 am
Nonstop0h 00m
$496
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Mon 12/21
4:25 pm-7:55 pm
Nonstop8h 30m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-6:00 am
Nonstop0h 00m
$499
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Mon 3/1
12:15 pm-3:40 pm
Nonstop8h 25m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-6:00 am
Nonstop0h 00m
$505
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Sun 3/7
12:15 pm-3:40 pm
Nonstop8h 25m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-6:00 am
Nonstop0h 00m
$505
Showing 1-10 of 22 resultsSorted by cheapest first
Compare providers for flights from Heathrow to Dulles Intl
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Heathrow to Dulles Intl in September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy2 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on London Heathrow Airport-Washington, D.C. Dulles Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on London Heathrow Airport-Washington, D.C. Dulles Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from London Heathrow Airport-Washington, D.C. Dulles Intl Airport flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on London Heathrow Airport-Washington, D.C. Dulles Intl Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London Heathrow Airport-Washington, D.C. Dulles Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
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 round-trip 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
How far ahead should I book a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?
The best time to book flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport is 81 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
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 $629). Flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $786). 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 September 10, 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 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 last year, United Airlines have had the lowest number of delays on this route, with just 10% of flights being delayed.
The best insider tips for London Heathrow Airport to Washington, D.C. Dulles Intl Airport flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your London Heathrow Airport to Washington, D.C. Dulles Intl Airport trip
Our travel experts
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 September 10, 2026.
See what other customers who have flown with United Airlines,Virgin Atlantic, andAmerican Airlines from London Heathrow Airport to Washington, D.C. Dulles Intl Airport have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
7.4
Food
6.7
Boarding
7.7
Comfort
7.3
Entertainment
7.1
Crew
8.1
Reviews
1 / 20
10.0
ExcellentDane,Jan 2026
TYS - IAD
Overall
7.4
Food
6.7
Boarding
7.7
Comfort
7.3
Entertainment
7.1
Crew
8.1
Reviews
1 / 20
10.0
ExcellentDane,Jan 2026
TYS - IAD
Overall
7.4
Food
6.7
Boarding
7.7
Comfort
7.3
Entertainment
7.1
Crew
8.1
Reviews
1 / 20
10.0
ExcellentDane,Jan 2026
TYS - IAD
Overall
7.4
Food
6.7
Boarding
7.7
Comfort
7.3
Entertainment
7.1
Crew
8.1
Reviews
1 / 20
10.0
ExcellentDane,Jan 2026
TYS - IAD
Overall
7.4
Food
6.7
Boarding
7.7
Comfort
7.3
Entertainment
7.1
Crew
8.1
Reviews
1 / 20
10.0
ExcellentDane,Jan 2026
TYS - IAD
Overall
7.4
Food
6.7
Boarding
7.7
Comfort
7.3
Entertainment
7.1
Crew
8.1
Reviews
1 / 20
10.0
ExcellentDane,Jan 2026
TYS - IAD
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.
Traveling 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 locationsAlexandria
Arlington
Owings Mills
Tysons
Lanham
Reston
Chantilly
Herndon
Rockville
Hyattsville
Fredericksburg
Woodbridge
Falls Church
Sterling
Hanover
Laurel
Oxon Hill
Clinton
Hunt Valley
Silver Spring
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Other flights to Dulles Intl
Explore flights to Dulles Intl departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 10, 2026.
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Heathrow and Dulles Intl flights
Browse other Heathrow and Dulles Intl flight options. Last updated on September 10, 2026.
Other flights from Heathrow
Browse through other flights departing from Heathrow. Flights are based on user searches made on Cheapflights and were last updated on September 10, 2026.
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Check out other popular destinations found by fellow travelers in 2026
Top 8 airlines flying from Heathrow to Dulles Intl
Discover the top 8 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 September 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$556 | Average$739 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$559 | Average$769 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$566 | Average$694 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$567 | Average$813 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$567 | Average$822 | FlexibilityNo cancel fee | On-time78% | |
| Cheapest$591 | Average$872 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$627 | Average$775 | FlexibilityNo cancel fee | On-time72% | |
| Cheapest$658 | Average$786 | FlexibilityNo cancel fee | On-timeN/A |