Cheapest return SFO–LHR flights, September

AirHint found the following cheapest return flights from San Francisco (SFO) to London (LHR) in September 2026 (see full year).

Return flights

21 Sep - 24 Sep Scandinavian Airlines
28 Sep - 12 Oct Scandinavian Airlines
30 Sep - 31 Oct Scandinavian Airlines
20 Sep - 26 Sep Scandinavian Airlines
18 Sep - 29 Sep Scandinavian Airlines
11 Sep - 18 Sep Scandinavian Airlines
15 Sep - 01 Oct Scandinavian Airlines
21 Sep - 07 Oct Scandinavian Airlines
30 Sep - 24 Oct Scandinavian Airlines
27 Sep - 10 Oct Scandinavian Airlines
30 Sep - 06 Oct TAP
30 Sep - 05 Oct TAP
29 Sep - 06 Oct TAP
09 Sep - 16 Sep Aer Lingus
09 Sep - 23 Sep Aer Lingus
06 Sep - 18 Sep Aer Lingus
09 Sep - 15 Oct Aer Lingus
01 Sep - 06 Sep Air Canada
09 Sep - 19 Sep Scandinavian Airlines
08 Sep - 13 Sep Scandinavian Airlines

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

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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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