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

Return flights

23 Aug - 30 Aug	China Airlines
27 Aug - 31 Aug	China Airlines
21 Aug - 24 Aug	China Airlines
26 Aug - 29 Aug	China Airlines
22 Aug - 30 Aug	China Airlines
19 Aug - 24 Aug	China Airlines
19 Aug - 25 Aug	China Airlines
29 Aug - 23 Sep	China Airlines
21 Aug - 08 Sep	China Airlines
27 Aug - 03 Sep	China Airlines
23 Aug - 30 Aug	United	direct
27 Aug - 31 Aug	United	direct
21 Aug - 27 Aug	United	direct
14 Aug - 15 Sep	United	direct
23 Aug - 02 Sep	United	direct
21 Aug - 08 Sep	United	direct

Also check the deals for one-way flights from Singapore to San Francisco 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 Singapore to San Francisco in August from $782

Return flights