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

Return flights

01 Dec - 31 Jan	Singapore Airlines	direct
08 Dec - 15 Dec	Korean Air
02 Dec - 11 Dec	Korean Air
02 Dec - 25 Dec	Korean Air
04 Dec - 10 Dec	Asiana Airlines
02 Dec - 11 Dec	United	direct
07 Dec - 14 Dec	Air Canada
02 Dec - 25 Dec	Singapore Airlines	direct
08 Dec - 15 Dec	United	direct
04 Dec - 10 Dec	United	direct
09 Dec - 30 Dec	United	direct
13 Dec - 19 Jan	Korean Air
11 Dec - 08 Jan	Turkish Airlines
06 Dec - 03 Jan	Turkish Airlines
26 Dec - 08 Jan	Hawaiian Airlines
26 Dec - 07 Jan	Turkish Airlines
26 Dec - 02 Jan	Turkish Airlines
11 Dec - 08 Jan	United	direct
08 Dec - 12 Jan	Singapore Airlines	direct
09 Dec - 16 Jan	Air France

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

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 December from $560

Return flights