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

Return flights

13 Sep - 22 Sep	Air India
02 Sep - 02 Oct	United	direct
01 Sep - 02 Oct	United	direct
30 Sep - 15 Oct	United	direct
13 Sep - 02 Oct	United	direct
14 Sep - 02 Oct	United	direct
30 Sep - 06 Oct	United	direct
30 Sep - 07 Oct	United	direct
29 Sep - 14 Oct	United	direct
01 Sep - 08 Sep	Air India
12 Sep - 19 Sep	Air India
21 Sep - 27 Sep	Air India
01 Sep - 20 Sep	Air India
13 Sep - 22 Sep	United	direct
01 Sep - 08 Sep	United	direct
12 Sep - 19 Sep	Singapore Airlines	direct
01 Sep - 20 Sep	Singapore Airlines	direct
07 Sep - 19 Sep	United	direct

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 543€

Return flights