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

Return flights

01 Dec - 10 Dec	Korean Air
09 Dec - 17 Dec	Korean Air
09 Dec - 16 Dec	Korean Air
04 Dec - 29 Dec	Korean Air
04 Dec - 15 Dec	EVA Air
01 Dec - 30 Dec	EVA Air
28 Dec - 18 Jan	EVA Air
02 Dec - 07 Jan	Korean Air
13 Dec - 08 Jan	Korean Air
24 Dec - 26 Dec	EVA Air
05 Dec - 05 Jan	China Airlines
16 Dec - 21 Dec	China Airlines
25 Dec - 11 Jan	China Airlines
14 Dec - 30 Dec	China Airlines
22 Dec - 13 Jan	China Airlines
23 Dec - 26 Dec	China Airlines
26 Dec - 06 Jan	China Airlines
26 Dec - 01 Jan	China Airlines
22 Dec - 12 Jan	EVA Air
15 Dec - 06 Jan	China Airlines

Also check the deals for one-way flights from San Jose to Bangkok 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 Bangkok in December from $789

Return flights