Flights London → Washington — September 21, 2026

One way · Economy · 1 adult · price per person

The cheapest itinerary observed for Monday, September 21, 2026 on the London–Washington route: 1 stop itinerary (2 flights), from London Gatwick (LGW) to Washington Dulles (IAD), first flight Air Transat TS283, departs 9:40 AM, flight time 9h 35m (layovers excluded), $469 per person. Fare as listed by Aviasales: carry-on bag not included (personal item only), checked bag not included, changes not allowed, non-refundable. Price found in an Aviasales search on September 6, 2026 and read by AirSource on September 10, 2026, 19:03 UTC: it is not guaranteed and is confirmed on Aviasales at booking time. The cheapest direct flight observed: United Airlines UA7807, from London Heathrow (LHR) to Washington Dulles (IAD), departs 4:40 PM, arrives 8:15 PM, direct, 8h 35m, $957 per person. Fare as listed by Aviasales: carry-on bag not included (personal item only), checked bag not included, changes not allowed, non-refundable.