Washington to London flights.

Washington → London · 15 fares

Try a nearby airport

Thin routes often have more options from a neighbouring airport.

Medium-haul is the classic 6-10 week booking window. Fares drift down as the departure gets closer until about 21 days out, then start climbing fast. Tuesday and Wednesday departures are typically 10-18% cheaper than Friday or Sunday.

Questions, answered

• How long is the flight from Washington to London?

  Non-stop flights on IAD → LHR are typically around 7 hours. Connecting itineraries add 3–8 hours depending on the hub and layover.

• Which airlines fly from Washington to London?

  The main carriers on this route are British Airways, United, Virgin Atlantic. Codeshare and one-stop options add several more — the filter panel above shows every airline in the current fare set.

• When is the cheapest time to fly from Washington to London?

  Historically the lowest fares land in January, November. Summer (mid-June through mid-August) and the Christmas / New Year window are always peak. Mid-week departures (Tuesday–Thursday) typically beat weekend prices by 10–20%.

• How far ahead should I book Washington to London?

  Six to ten weeks ahead is the sweet spot for this route. Inside three weeks, fares tend to spike as airlines sell to last-minute business travellers. Award availability often opens 10–11 months out if you're booking on miles.

• Can I book directly on destination.com?

  The Book button on each fare opens the airline or OTA (Trip.com, Kiwi, Expedia, Booking, Priceline, etc.) that's actually selling that ticket. You complete payment there at the same price you saw here — we never add a markup.