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

Return flights

28 Dec - 18 Jan	Air India
02 Dec - 25 Dec	ANA
01 Dec - 31 Jan	Asiana Airlines
09 Dec - 26 Jan	United	direct
10 Dec - 25 Dec	United	direct
28 Dec - 27 Jan	Air India
28 Dec - 14 Jan	Air India
28 Dec - 17 Jan	Air India
27 Dec - 17 Jan	Air India
28 Dec - 14 Jan	United	direct
09 Dec - 30 Dec	United	direct
28 Dec - 17 Jan	United	direct
27 Dec - 17 Jan	United	direct
14 Dec - 21 Dec	United	direct
15 Dec - 24 Dec	Alaska Airlines
12 Dec - 17 Dec	United	direct
26 Dec - 31 Dec	United	direct
14 Dec - 26 Dec	Air Canada
13 Dec - 25 Dec	Air Canada
15 Dec - 24 Dec	Singapore Airlines	direct

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 $700

Return flights