Flights London → San Francisco — September 24, 2026

One way · Economy · 1 adult · price per person

The cheapest itinerary observed for Thursday, September 24, 2026 on the London–San Francisco route: 1 stop itinerary (2 flights) via Toronto (YYZ), from London Gatwick (LGW) to San Francisco International (SFO), first flight Air Transat TS123, departs 12:40 PM, arrives 11:04 PM, total travel time 18h 24m including layovers, flight time 13h 34m (layovers excluded), $609 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 9, 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 UA7855, from London Heathrow (LHR) to San Francisco International (SFO), departs 1:00 PM, arrives 4:05 PM, direct, 11h 5m, $656 per person. Fare as listed by Aviasales: carry-on bag not included (personal item only), checked bag not included, changes not allowed, non-refundable.