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Cheap IAD to LHR Flights

Prices found within past 7 days. Prices and availability subject to change. Additional terms may apply.

Washington to London route information

Origin Airport Washington Dulles Intl.
Destination Airport Heathrow
Airlines Serving Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, Icelandair, KLM, Lufthansa, Royal Air Maroc, SAS, Swiss International Air Lines, TAP Portugal, Turkish Airlines, United, Virgin Atlantic
Flight Price $441
Distance 3,666 mi

London

$433.97

$492.23

$550.02

$4,523.02

Cheap IAD to LHR Flights

  • Question : What is the cheapest day to fly?
    Answer : The cheapest day to fly from Dulles to London is on Friday. So, if you are trying to save a bit of cash on your next vacation look for flights on Friday.
  • Question : How many flights are there per day from Dulles to London?
    Answer : The number does differ by the day, but on average, you can expect nine different choices of flight times when you book. You'll have the same number of choices on this route as most other routes departing the United States.
  • Question : From Dulles to London, which day is going to have the most flight times?
    Answer : The day with the most departure times for this route is Sunday with 10 options. Friday currently offers the fewest number of flight times with only nine options.
  • Question : Which airline has the least delays from Dulles to London?
    Answer : Booking with United Airlines means you will arrive to London approximately the time you were supposed to. In fact, this timely airline has a 90% average for landing before the plane turns into a pumpkin.
  • Question : What is the cheapest day to fly to London?
    Answer : Mar 12th has bookings (as of Mar 11th) as cheap as $358. That comes in 61% below the average price for this route. Saving on flight fares gives you more cash to spend on your trip.
  • Question : How much time do people spend in London?
    Answer : The average time spent hanging out in London by travelers from Dulles is 11 days. However long you decide to stay, give yourself plenty of time to see what makes London fantastic.
  • Question : How much is a plane ticket to London (LHR) from Dulles (IAD)?
    Answer : Prices vary anywhere from $358 to $10,065. Booking far in advance can usually help you get the cheapest price. The further out you reserve your ticket, the more likely you are to save.