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

Return flights

15 Sep - 24 Sep	Air India
15 Sep - 24 Sep	Singapore Airlines	direct
25 Sep - 29 Sep	Air India
25 Sep - 29 Sep	Singapore Airlines	direct
19 Sep - 24 Sep	Air India
13 Sep - 21 Sep	Air India
01 Sep - 08 Sep	Asiana Airlines
05 Sep - 12 Sep	Air India
01 Sep - 08 Sep	Singapore Airlines	direct
06 Sep - 13 Sep	Air India
28 Sep - 03 Oct	Delta
27 Sep - 03 Oct	Delta

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 $586

Return flights