Route · IAD → LHR
Flights from Washington to London
Washington Dulles to London Heathrow is one of the busiest transatlantic corridors, covering roughly 5,900 km with a typical westbound block time of around seven and a quarter hours and an eastbound run closer to six and a half thanks to prevailing tailwinds. United Airlines and American Airlines anchor the route with daily widebody service — United typically operates Boeing 767s and 777s, while American favors the 777 — joined by Iberia, Lufthansa, and Singapore Airlines, the last of which uses the route as a long-haul connection point rather than a primary market. A practical note worth flagging: most transatlantic arrivals land at Heathrow Terminal 2 or 5, and clearing UK Border Force during peak morning banks can add thirty to forty-five minutes beyond the aircraft door. For fares, shoulder season — late January through March and again in October — tends to offer the most competitive pricing, while business-class award availability on partner programs often opens up midweek departures.
We may earn a commission when you book — at no cost to you.
Cheapest dates to fly
Live prices · powered by AviasalesThe calendar below pulls live fares from our search partner for Washington (IAD) → London (LHR). Use the year view… to spot the cheapest week to fly, the day-of-week patterns most travellers miss, and any shoulder-season dips worth shifting your trip around. Prices refresh every few hours, so what you see is what your booking page should look like a moment later — click any date to jump straight to the fare on Aviasales.
Airlines on this route
5 carriersThe 5 carriers we currently track on the Washington–London route, from full-service flag carriers to low-cost competitors. Tap any airline for its full profile, baggage… rules, fleet context, and a live fare search pre-filtered to that carrier — useful if you're loyal to a frequent-flyer programme, want to compare onboard product on the same dates, or are weighing a cheaper one-stop against a pricier nonstop.
Flights from Washington to London
Live schedule · powered by AviasalesBelow is the published weekly schedule for nonstop and one-stop services from Washington to London — the actual flight numbers, departure and arrival times your… booking page will pull from. Use it to plan around departure preferences (early morning vs late evening), see which carriers fly on which weekdays, or pick a connection that lets you sleep in your own bed before a long-haul leg. Click any row to load it directly in the search.
Airport guides
Quick links into the airport profiles at both ends of the route. Each guide covers terminal layout, the airlines that base hubs at IAD and… LHR, the other routes those airports serve, and the ground-transit options most travellers wish they'd read about before landing — the practical context you only really need to know once you've booked, but want to skim before you do.