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IAD to LHR: distance & flight time
Washington (Washington Dulles International Airport) → London (London Heathrow Airport)
3,667 mi
5,902 km · 3,187 nm
7h 39m
estimated nonstop flight time
+5h
time difference · heading northeast
See live IAD→LHR fares Phone-only fares on this route — call free
Flight time details
3,667 miles nonstop takes roughly 7h 39m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 5-hour time gain when reading arrival times on your ticket.
The two airports
- IAD — Washington Dulles International Airport · Washington, United States
- LHR — London Heathrow Airport · London, United Kingdom
Distances are great-circle ("as the crow flies") — the same basis airlines use for frequent-flyer miles.
Alternate airports can cut this fare
Flying from or into a nearby airport is the #1 trick our agents use to beat online prices. Call and we'll compare every combination on one call.
Near IAD
Near LHR
- LGW · London Gatwick Airport25 mi away
- NHT · RAF Northolt6 mi away
- HYC · Wycombe Air Park18 mi away
- FAB · Farnborough Airport19 mi away
Frequently asked questions
How far is IAD from LHR?
The flight distance from Washington (IAD) to London (LHR) is 3,667 miles (5,902 km, 3,187 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from IAD to LHR?
A nonstop flight takes about 7h 39m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
What is the time difference between Washington and London?
London is 5 hours ahead of Washington.
What is the cheapest way to fly from IAD to LHR?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on IAD–LHR that never appear on search engines, with no booking fees.