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

Return flights

21 Aug - 03 Sep	Air India
16 Aug - 04 Sep	Air India
29 Aug - 05 Sep	Air India
10 Aug - 26 Aug	Asiana Airlines
21 Aug - 02 Sep	Asiana Airlines
25 Aug - 01 Sep	Asiana Airlines
20 Aug - 29 Aug	Asiana Airlines
05 Aug - 28 Aug	Asiana Airlines
28 Aug - 11 Sep	Air India
31 Aug - 07 Sep	Asiana Airlines
13 Aug - 27 Aug	Asiana Airlines
15 Aug - 24 Aug	Air India
18 Aug - 24 Aug	Asiana Airlines
04 Aug - 11 Aug	Asiana Airlines
13 Aug - 27 Aug	United	direct
02 Aug - 18 Aug	United	direct
28 Aug - 11 Sep	United	direct
16 Aug - 01 Sep	United	direct
21 Aug - 03 Sep	United	direct
05 Aug - 28 Aug	United	direct

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

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 August from $644

Return flights