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

Return flights

21 Aug - 02 Sep	Korean Air
20 Aug - 27 Aug	Korean Air
21 Aug - 29 Aug	Delta
25 Aug - 01 Sep	Asiana Airlines
20 Aug - 29 Aug	Asiana Airlines
18 Aug - 31 Aug	Asiana Airlines
26 Aug - 13 Sep	Asiana Airlines
28 Aug - 31 Aug	Asiana Airlines
19 Aug - 26 Aug	Cathay Pacific
20 Aug - 24 Aug	Cathay Pacific
21 Aug - 25 Aug	Cathay Pacific
21 Aug - 03 Sep	Philippine Airlines
19 Aug - 26 Aug	United	direct
21 Aug - 03 Sep	United	direct
18 Aug - 21 Aug	United	direct
21 Aug - 02 Sep	United	direct
29 Aug - 01 Sep	United
26 Aug - 13 Sep	United	direct
30 Aug - 05 Sep	United	direct
29 Aug - 05 Sep	Delta

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 585€

Return flights