
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $526 (Expedia) |
One-way from | $487 (Kiwi.com) |
Popular in | July |
Cheapest in | February |
Average price | $644 |
Good round-trip deal | $571 or less |
Good one-way deal | $627 or less |
Fly from
Fly to
Route
Depart
Return
Price
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Fri 2/27
9:00 am-4:40 pm
1 stop12h 40m
Washington, D.C. Dulles Intl
Fri 5/1
9:50 pm-10:40 am
Nonstop7h 50m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Sun 3/1
9:00 am-4:40 pm
1 stop12h 40m
Washington, D.C. Dulles Intl
Sun 5/3
6:25 pm-6:55 am
Nonstop7h 30m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Mon 3/2
7:25 pm-2:40 pm
1 stop24h 15m
Washington, D.C. Dulles Intl
Wed 4/29
10:10 pm-10:40 am
Nonstop7h 30m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Thu 4/23
12:10 pm-4:45 pm
1 stop33h 35m
Washington, D.C. Dulles Intl
Tue 6/30
9:45 am-10:00 am
1 stop19h 15m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Sun 3/1
8:30 am-3:50 pm
1 stop12h 20m
Washington, D.C. Dulles Intl
Sat 3/7
6:20 pm-6:40 am
Nonstop7h 20m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Fri 2/27
4:20 pm-8:15 pm
Nonstop8h 55m
Washington, D.C. Dulles Intl
Tue 3/3
10:15 pm-10:50 am
Nonstop7h 35m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Tue 3/3
12:05 pm-3:35 pm
Nonstop8h 30m
Washington, D.C. Dulles Intl
Wed 4/29
6:25 pm-6:55 am
Nonstop7h 30m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Wed 3/11
4:20 pm-9:15 pm
Nonstop8h 55m
Washington, D.C. Dulles Intl
Wed 3/18
7:20 pm-6:40 am
Nonstop7h 20m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Fri 5/22
6:50 am-1:30 pm
1 stop11h 40m
Washington, D.C. Dulles Intl
Wed 5/27
6:30 pm-6:55 am
Nonstop7h 25m
LondonWashington, D.C.
LHR - IAD
LHRIAD
London Heathrow
Thu 6/18
4:40 pm-8:00 pm
Nonstop8h 20m
Washington, D.C. Dulles Intl
Thu 7/9
6:00 am-9:35 pm
1 stop10h 35m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | 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 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, January is the cheapest month in which you can book a flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport (average of $499). Flying from London Heathrow Airport to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $629). 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 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.
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 9% of flights being delayed.
Reykjavik (KEF) – chosen by Cheapflights users on 75% 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.
Boarding
Crew
Entertainment
Overall
Comfort
Food
Reviews
Jim,Nov 2025
AVL - ATL
Boarding
Crew
Entertainment
Overall
Comfort
Food
Reviews
Jim,Nov 2025
AVL - ATL
Boarding
Crew
Entertainment
Overall
Comfort
Food
Reviews
Jim,Nov 2025
AVL - ATL
Boarding
Crew
Entertainment
Overall
Comfort
Food
Reviews
Jim,Nov 2025
AVL - ATL
Boarding
Crew
Entertainment
Overall
Comfort
Food
Reviews
Jim,Nov 2025
AVL - ATL
Boarding
Crew
Entertainment
Overall
Comfort
Food
Reviews
Jim,Nov 2025
AVL - ATL
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$271 | Average$833 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$320 | Average$925 | 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$732 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$559 | Average$711 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$562 | Average$772 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$567 | Average$808 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$572 | Average$793 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$635 | Average$663 | FlexibilityNo cancel fee | On-time67% |