
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $651 (Air Canada) |
One-way from | $545 (Kiwi.com) |
Popular in | June |
Cheapest in | February |
Average price | $819 |
Good round-trip deal | $763 or less |
Good one-way deal | $758 or less |
Fly from
Fly to
Route
Depart
Return
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Mon 8/3
4:40 pm-8:00 pm
Nonstop8h 20m
Washington, D.C. Dulles Intl
Mon 8/10
6:30 pm-6:55 am
Nonstop7h 25m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Wed 7/22
4:40 pm-8:00 pm
Nonstop8h 20m
Washington, D.C. Dulles Intl
Mon 8/10
6:30 pm-6:55 am
Nonstop7h 25m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Sat 8/8
7:45 am-11:19 pm
1 stop20h 34m
Washington, D.C. Dulles Intl
Tue 8/18
6:30 pm-6:55 am
Nonstop7h 25m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Sat 10/10
8:40 am-3:35 pm
1 stop11h 55m
Washington, D.C. Dulles Intl
Fri 10/23
5:30 pm-1:15 pm
1 stop14h 45m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Sat 8/22
5:55 pm-8:55 pm
Nonstop8h 00m
Washington, D.C. Dulles Intl
Wed 9/23
10:55 pm-11:20 am
Nonstop7h 25m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Sat 8/22
5:55 pm-8:55 pm
Nonstop8h 00m
Washington, D.C. Dulles Intl
Thu 9/24
10:55 pm-11:20 am
Nonstop7h 25m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Tue 10/6
5:55 pm-9:05 pm
Nonstop8h 10m
Washington, D.C. Dulles Intl
Fri 10/16
10:55 pm-11:20 am
Nonstop7h 25m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Tue 10/6
5:55 pm-9:05 pm
Nonstop8h 10m
Washington, D.C. Dulles Intl
Thu 10/15
10:55 pm-11:20 am
Nonstop7h 25m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Sat 8/1
9:30 am-4:05 pm
1 stop11h 35m
Washington, D.C. Dulles Intl
Tue 8/11
10:15 pm-10:40 am
Nonstop7h 25m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Wed 9/9
7:05 am-5:00 pm
2 stops14h 55m
Washington, D.C. Dulles Intl
Mon 9/21
8:20 pm-4:25 pm
2 stops15h 05m
| 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*3 stars | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
The best time to book flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport is 84 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.
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 $625). Flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $819). 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.
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.
About 18% of weekly flights between London and Washington, D.C. have experienced delays in the past year, with the average delay time being 133 minutes.
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.
Saturday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.
Over the last year, United Airlines have had the lowest number of delays on this route, with just 12% of flights being delayed.
Lisbon (LIS) – chosen by Cheapflights users on 50% of 1-stop itineraries from London Heathrow Airport to Washington, D.C. Dulles Intl Airport on Cheapflights.
Lisbon (LIS) is the most affordable 1-stop option, with an average round-trip price of $509.
Flights via Reykjavik (KEF) have the shortest average one-way travel time for 1-stop routes: 11h 15m.
Flights via Lisbon (LIS) offer the fastest connection on this route, with an average layover time of 1h 23m.
Overall
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Edwin,May 2026
LHR - LAX
Overall
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Edwin,May 2026
LHR - LAX
Overall
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Edwin,May 2026
LHR - LAX
Overall
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Edwin,May 2026
LHR - LAX
Overall
Entertainment
Food
Comfort
Boarding
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Reviews
Edwin,May 2026
LHR - LAX
Overall
Entertainment
Food
Comfort
Boarding
Crew
Reviews
Edwin,May 2026
LHR - LAX
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$320 | Average$964 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$466 | Average$672 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$473 | Average$730 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$523 | Average$742 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$534 | Average$743 | FlexibilityNo cancel fee | On-time78% | |
| Cheapest$559 | Average$720 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$567 | Average$772 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$571 | Average$714 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$635 | Average$663 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$658 | Average$804 | FlexibilityNo cancel fee | On-timeN/A |