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

Return flights

06 Dec - 06 Jan	United	direct
15 Dec - 05 Jan	China Airlines
19 Dec - 03 Jan	Cathay Pacific
15 Dec - 29 Dec	China Airlines
24 Dec - 31 Dec	China Airlines
25 Dec - 29 Dec	China Airlines
23 Dec - 05 Jan	China Airlines
20 Dec - 28 Dec	China Airlines
25 Dec - 10 Jan	China Airlines
20 Dec - 06 Jan	China Airlines
15 Dec - 22 Dec	Cathay Pacific
24 Dec - 03 Jan	Cathay Pacific
27 Dec - 07 Jan	China Airlines
27 Dec - 07 Jan	United	direct
28 Dec - 07 Jan	United	direct
06 Dec - 08 Dec	United	direct
24 Dec - 31 Dec	United	direct
15 Dec - 15 Dec	STARLUX Airlines
25 Dec - 29 Dec	United	direct
15 Dec - 29 Dec	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 615€

Return flights