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

Return flights

03 Dec - 15 Dec	China Airlines
03 Dec - 16 Dec	China Airlines
31 Dec - 15 Jan	Korean Air
03 Dec - 20 Jan	Korean Air
03 Dec - 26 Jan	Korean Air
03 Dec - 22 Jan	Korean Air
07 Dec - 16 Dec	China Airlines
05 Dec - 12 Dec	Korean Air
05 Dec - 14 Dec	Korean Air
04 Dec - 11 Dec	Korean Air
03 Dec - 24 Dec	Korean Air
04 Dec - 20 Jan	Korean Air
04 Dec - 15 Jan	Korean Air
07 Dec - 14 Dec	China Airlines
04 Dec - 14 Dec	China Airlines
06 Dec - 14 Dec	China Airlines
08 Dec - 20 Jan	Korean Air
06 Dec - 14 Jan	Korean Air
06 Dec - 13 Jan	Korean Air
02 Dec - 15 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 $772

Return flights