Cheapest return flights from London to San Francisco in September from $496

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

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

Return flights

06 Sep - 06 Oct Austrian Airlines
17 Sep - 08 Oct TAP
04 Sep - 24 Sep Scandinavian Airlines
16 Sep - 29 Sep TAP
16 Sep - 30 Sep TAP
16 Sep - 25 Sep TAP
15 Sep - 08 Oct Scandinavian Airlines
22 Sep - 15 Oct TAP
22 Sep - 13 Oct TAP
23 Sep - 15 Oct Scandinavian Airlines
10 Sep - 24 Sep Air Canada
24 Sep - 29 Sep Air Canada
10 Sep - 18 Sep Air Canada
10 Sep - 16 Sep Air Canada
18 Sep - 08 Oct TAP
10 Sep - 17 Sep Air Canada
17 Sep - 24 Sep Scandinavian Airlines
24 Sep - 01 Oct Scandinavian Airlines
23 Sep - 01 Oct Scandinavian Airlines
18 Sep - 02 Oct TAP

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