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

Return flights

15 Sep - 19 Sep	Philippine Airlines
20 Sep - 09 Oct	United	direct
26 Sep - 12 Oct	United	direct
14 Sep - 02 Oct	United	direct
02 Sep - 13 Sep	United	direct
03 Sep - 13 Sep	United	direct
16 Sep - 21 Sep	United	direct
16 Sep - 20 Sep	United	direct
02 Sep - 24 Sep	United	direct
05 Sep - 10 Sep	United	direct
17 Sep - 22 Sep	United	direct
18 Sep - 22 Sep	United	direct
05 Sep - 08 Sep	United	direct
13 Sep - 02 Oct	United	direct
24 Sep - 16 Oct	United	direct
23 Sep - 03 Oct	United	direct
17 Sep - 04 Oct	United	direct
18 Sep - 04 Oct	United	direct
18 Sep - 05 Oct	United	direct
28 Sep - 05 Oct	United	direct

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

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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Cheapest return flights from Singapore to San Francisco in September from 508€

Return flights