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

Return flights

02 Dec - 25 Dec	United	direct
01 Dec - 15 Dec	Asiana Airlines
01 Dec - 15 Dec	United	direct
09 Dec - 16 Dec	Asiana Airlines
08 Dec - 15 Dec	Asiana Airlines
01 Dec - 22 Dec	Delta
08 Dec - 15 Dec	United	direct
10 Dec - 17 Dec	Cathay Pacific
29 Dec - 12 Jan	Cathay Pacific
09 Dec - 16 Dec	Singapore Airlines	direct
10 Dec - 17 Dec	Singapore Airlines	direct
29 Dec - 07 Jan	ANA
29 Dec - 12 Jan	Singapore Airlines	direct
29 Dec - 07 Jan	United	direct
26 Dec - 02 Jan	Asiana Airlines
14 Dec - 01 Jan	Air India
19 Dec - 06 Jan	Philippine Airlines
18 Dec - 01 Jan	Air India
18 Dec - 08 Jan	Air India
26 Dec - 07 Jan	United	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 546€

Return flights