Flights London → Chicago — September 21, 2026

One way · Economy · 1 adult · price per person

The cheapest itinerary observed for Monday, September 21, 2026 on the London–Chicago route: 1 stop itinerary (2 flights) via Montreal (YUL), from London Gatwick (LGW) to Chicago O'Hare (ORD), first flight Air Transat TS729, departs 11:35 AM, arrives 8:12 PM, total travel time 14h 37m including layovers, flight time 10h 22m (layovers excluded), $523 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 UA9085, from London Heathrow (LHR) to Chicago O'Hare (ORD), departs 11:05 AM, arrives 2:10 PM, direct, 9h 5m, $1,018 per person. Fare as listed by Aviasales: carry-on bag not included (personal item only), checked bag not included, changes not allowed, non-refundable.