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

Return flights

21 Aug - 30 Aug	United	direct
28 Aug - 31 Aug	United	direct
21 Aug - 06 Sep	United	direct
20 Aug - 21 Aug	United	direct
21 Aug - 24 Aug	United	direct
19 Aug - 29 Aug	United	direct
19 Aug - 26 Aug	United	direct
25 Aug - 29 Aug	United	direct
19 Aug - 24 Aug	United	direct
29 Aug - 26 Sep	United	direct
21 Aug - 02 Sep	United	direct
19 Aug - 03 Sep	United	direct
21 Aug - 01 Sep	United	direct
21 Aug - 04 Sep	United	direct
30 Aug - 06 Sep	United	direct
30 Aug - 05 Sep	United	direct
29 Aug - 12 Sep	United	direct
26 Aug - 07 Sep	United	direct
20 Aug - 27 Aug	United	direct
20 Aug - 29 Aug	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 509€

Return flights