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

Return flights

16 Oct - 24 Oct	Cathay Pacific
24 Oct - 29 Oct	Cathay Pacific
16 Oct - 26 Oct	Cathay Pacific
17 Oct - 29 Oct	Cathay Pacific
01 Oct - 05 Oct	Cathay Pacific
04 Oct - 18 Oct	Cathay Pacific
20 Oct - 31 Oct	Cathay Pacific
18 Oct - 29 Oct	Cathay Pacific
15 Oct - 12 Nov	Cathay Pacific
11 Oct - 18 Oct	Cathay Pacific
03 Oct - 12 Oct	Cathay Pacific
27 Oct - 04 Nov	China Airlines
15 Oct - 12 Nov	United	direct
11 Oct - 14 Nov	United	direct
24 Oct - 02 Nov	United	direct
27 Oct - 04 Nov	United	direct
26 Oct - 08 Nov	Delta
25 Oct - 22 Nov	United	direct

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

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 October from $650

Return flights