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

Return flights

26 Sep - 03 Oct	United	direct
26 Sep - 04 Oct	United	direct
29 Sep - 06 Oct	United	direct
15 Sep - 01 Oct	United	direct
28 Sep - 05 Oct	United	direct
28 Sep - 04 Oct	United	direct
26 Sep - 06 Oct	United	direct
19 Sep - 24 Sep	Korean Air
01 Sep - 15 Sep	Delta
02 Sep - 10 Sep	Delta
04 Sep - 19 Sep	Delta
15 Sep - 19 Sep	Delta
15 Sep - 26 Sep	Delta
15 Sep - 22 Sep	Delta
08 Sep - 22 Sep	Asiana Airlines
04 Sep - 08 Sep	Asiana Airlines
05 Sep - 16 Sep	Air India
27 Sep - 03 Oct	Air India

Also check the deals for one-way flights from San Francisco to Singapore 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 San Francisco to Singapore in September from 547€

Return flights