
Most accurate provider | Gotogate 3 stars |
|---|---|
Most trusted provider | Gotogate 3 stars |
Round-trip from | $548 (Air Canada) |
One-way from | $521 (Trip.com) |
Popular in | July |
Cheapest in | September |
Average price | $698 |
Good round-trip deal | $572 or less |
Good one-way deal | $752 or less |
Fly from
Fly to
Route
Depart
Return
Price
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Wed 2/18
8:50 am-3:35 pm
1 stop11h 45m
Washington, D.C. Dulles Intl
Sat 2/28
6:20 pm-6:30 am
Nonstop7h 10m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Sat 5/16
1:05 pm-7:20 pm
1 stop11h 15m
Washington, D.C. Dulles Intl
Thu 5/21
8:30 pm-11:55 am
1 stop10h 25m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Sat 2/14
4:20 pm-8:15 pm
Nonstop8h 55m
Washington, D.C. Dulles Intl
Mon 2/23
6:20 pm-6:40 am
Nonstop7h 20m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Sun 2/15
12:05 pm-3:35 pm
Nonstop8h 30m
Washington, D.C. Dulles Intl
Thu 2/26
6:20 pm-6:40 am
Nonstop7h 20m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Sun 5/31
9:50 am-3:45 pm
1 stop10h 55m
Washington, D.C. Dulles Intl
Sat 6/6
10:25 pm-10:50 am
Nonstop7h 25m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Thu 5/14
12:35 pm-3:50 pm
Nonstop8h 15m
Washington, D.C. Dulles Intl
Fri 5/22
5:40 pm-6:20 am
Nonstop7h 40m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Thu 5/14
2:00 pm-5:25 pm
Nonstop8h 25m
Washington, D.C. Dulles Intl
Wed 5/20
7:15 pm-7:45 am
Nonstop7h 30m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Mon 5/25
4:40 pm-8:00 pm
Nonstop8h 20m
Washington, D.C. Dulles Intl
Fri 6/5
5:35 pm-9:35 pm
1 stop23h 00m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Fri 3/6
6:50 am-4:25 pm
2 stops14h 35m
Washington, D.C. Dulles Intl
Fri 3/13
6:15 pm-9:45 am
1 stop11h 30m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Sat 4/11
8:45 am-4:45 pm
1 stop13h 00m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| 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 69 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, September is the cheapest month in which you can book a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport (average of $511). Flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $652). 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 17% of weekly flights between London and Washington, D.C. have experienced delays in the past year, with the average delay time being 132 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.
Wednesday 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, Virgin Atlantic have had the lowest number of delays on this route, with just 8% of flights being delayed.
Lisbon (LIS) – chosen by Cheapflights users on 38% 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 $546.
Flights via Dublin (DUB) have the shortest average one-way travel time for 1-stop routes: 11h 00m.
Flights via Reykjavik (KEF) offer the fastest connection on this route, with an average layover time of 1h 25m.
Boarding
Overall
Crew
Entertainment
Food
Comfort
Reviews
Jim,Nov 2025
AVL - ATL
Boarding
Overall
Crew
Entertainment
Food
Comfort
Reviews
Jim,Nov 2025
AVL - ATL
Boarding
Overall
Crew
Entertainment
Food
Comfort
Reviews
Jim,Nov 2025
AVL - ATL
Boarding
Overall
Crew
Entertainment
Food
Comfort
Reviews
Jim,Nov 2025
AVL - ATL
Boarding
Overall
Crew
Entertainment
Food
Comfort
Reviews
Jim,Nov 2025
AVL - ATL
Boarding
Overall
Crew
Entertainment
Food
Comfort
Reviews
Jim,Nov 2025
AVL - ATL
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$271 | Average$833 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$320 | Average$926 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$431 | Average$984 | FlexibilityNo cancel fee | On-time78% | |
| Cheapest$473 | Average$730 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$485 | Average$720 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$559 | Average$711 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$567 | Average$808 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$567 | Average$803 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$572 | Average$772 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$635 | Average$663 | FlexibilityNo cancel fee | On-time67% |