Flights London → San Francisco — September 19, 2026

One way · Economy · 1 adult · price per person

The cheapest itinerary observed for Saturday, September 19, 2026 on the London–San Francisco route: 1 stop itinerary (2 flights) via Los Angeles International (LAX), from London Heathrow (LHR) to San Francisco International (SFO), first flight American Airlines AA135, departs 8:20 AM, arrives 3:30 PM, total travel time 15h 10m including layovers, flight time 12h 54m (layovers excluded), $440 per person. Fare as listed by Aviasales: carry-on bag included, checked bag not included, changes not allowed, non-refundable. Price found in an Aviasales search on September 4, 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, $629 per person. Fare as listed by Aviasales: carry-on bag not included (personal item only), checked bag not included, changes not allowed, non-refundable.