AirHint found the following cheapest return flights from San Francisco (SFO) to London (LHR) in September 2026 (see full year).
Return flights
| 08 Sep - 15 Sep | Scandinavian Airlines | ||
| 30 Sep - 12 Oct | Scandinavian Airlines | ||
| 08 Sep - 15 Sep | American Airlines | direct | |
| 30 Sep - 12 Oct | Air France | direct |
Also check the deals for one-way flights from San Francisco to London in September.
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