Cheapest return flights from San Francisco to London in September from $632

Best time to book flights for San Francisco (SFO) to London (LGW) flights at AirHint

AirHint found the following cheapest return flights from San Francisco (SFO) to London (LGW) in September 2025 (see full year).

Return flights

10 Sep - 17 Sep British Airways
09 Sep - 17 Sep British Airways
09 Sep - 30 Sep TAP
16 Sep - 23 Sep Aer Lingus
10 Sep - 20 Sep British Airways
04 Sep - 11 Sep British Airways
18 Sep - 27 Sep British Airways
24 Sep - 11 Oct TAP
22 Sep - 28 Sep Flair Airlines
26 Sep - 04 Oct jetBlue
05 Sep - 19 Sep Alaska Airlines
14 Sep - 26 Sep jetBlue
30 Sep - 02 Oct Flair Airlines

Also check the deals for one-way flights from San Francisco to London in September.

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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