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

Return flights

06 Oct - 15 Oct	Singapore Airlines	direct
28 Oct - 13 Nov	Singapore Airlines	direct
09 Oct - 13 Oct	Singapore Airlines	direct
01 Oct - 07 Oct	United	direct
01 Oct - 16 Oct	United	direct
27 Oct - 31 Oct	Asiana Airlines
09 Oct - 21 Oct	Singapore Airlines	direct
08 Oct - 29 Oct	Philippine Airlines
27 Oct - 31 Oct	United	direct
25 Oct - 07 Nov	Singapore Airlines	direct
01 Oct - 15 Oct	Vietnam Airlines
01 Oct - 21 Oct	Vietnam Airlines
04 Oct - 01 Nov	Air Canada

Also check the deals for one-way flights from San Francisco to Singapore 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 San Francisco to Singapore in October from $570

Return flights