Flights London → San Francisco — September 14, 2026

One way · Economy · 1 adult · price per person

The cheapest itinerary observed for Monday, September 14, 2026 on the London–San Francisco route: 2 stops itinerary (3 flights) via Dublin (DUB) and Calgary (YYC), from London Stansted (STN) to San Francisco International (SFO), first flight Ryanair FR256, departs 10:45 PM, arrives 12:00 PM 2 days later, total travel time 45h 15m including layovers, flight time 12h 35m (layovers excluded), $610 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 UA9374, from London Heathrow (LHR) to San Francisco International (SFO), departs 10:35 AM, arrives 1:35 PM, direct, 11h, $1,562 per person. Fare as listed by Aviasales: carry-on bag not included (personal item only), checked bag not included, changes not allowed, non-refundable.