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

Return flights

23 Dec - 30 Dec	Cathay Pacific
24 Dec - 31 Dec	Cathay Pacific
11 Dec - 10 Jan	Cathay Pacific
26 Dec - 11 Jan	United	direct
23 Dec - 31 Dec	China Airlines
04 Dec - 09 Dec	Cathay Pacific
24 Dec - 06 Jan	Cathay Pacific
25 Dec - 06 Jan	Cathay Pacific
24 Dec - 31 Dec	United	direct
23 Dec - 31 Dec	United	direct
24 Dec - 06 Jan	United	direct
25 Dec - 06 Jan	United	direct
12 Dec - 30 Jan	United	direct
20 Dec - 11 Jan	United	direct
22 Dec - 29 Dec	China Airlines
22 Dec - 31 Dec	China Airlines
21 Dec - 31 Dec	China Airlines
20 Dec - 31 Dec	China Airlines
22 Dec - 06 Jan	China Airlines
01 Dec - 12 Jan	United	direct

Also check the deals for one-way flights from Singapore to San Francisco 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 Singapore to San Francisco in December from $666

Return flights