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

Return flights

02 Dec - 25 Dec	Japan Airlines
02 Dec - 09 Dec	Japan Airlines
03 Dec - 10 Dec	Singapore Airlines
01 Dec - 08 Dec	Singapore Airlines
13 Dec - 26 Dec	China Airlines
12 Dec - 20 Dec	EVA Air
24 Dec - 31 Dec	Singapore Airlines
17 Dec - 06 Jan	China Airlines
17 Dec - 05 Jan	China Airlines
12 Dec - 04 Jan	Singapore Airlines
16 Dec - 02 Jan	China Airlines
17 Dec - 01 Jan	China Airlines
18 Dec - 01 Jan	EVA Air
20 Dec - 06 Jan	EVA Air
26 Dec - 05 Jan	Alaska Airlines
19 Dec - 06 Jan	EVA Air
20 Dec - 05 Jan	Japan Airlines

Also check the deals for one-way flights from San Jose 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 Jose to Singapore in December from $1063

Return flights