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

Return flights

02 Dec - 23 Dec	Korean Air
02 Dec - 23 Dec	United	direct
28 Dec - 13 Jan	United	direct
29 Dec - 13 Jan	Cathay Pacific
29 Dec - 13 Jan	United	direct
27 Dec - 13 Jan	Asiana Airlines
27 Dec - 13 Jan	United	direct
14 Dec - 23 Dec	Flair Airlines
28 Dec - 10 Jan	Delta
14 Dec - 23 Dec	United	direct
14 Dec - 28 Dec	United	direct
14 Dec - 18 Jan	United	direct
13 Dec - 03 Jan	Turkish Airlines
20 Dec - 10 Jan	Flair Airlines
14 Dec - 03 Jan	Turkish Airlines

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 617€

Return flights