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

Return flights

29 Dec - 26 Jan	Asiana Airlines
29 Dec - 14 Jan	Asiana Airlines
03 Dec - 25 Dec	Asiana Airlines
03 Dec - 24 Dec	Asiana Airlines
01 Dec - 11 Dec	Asiana Airlines
01 Dec - 12 Jan	Asiana Airlines
03 Dec - 12 Jan	Asiana Airlines
30 Dec - 22 Jan	Korean Air
08 Dec - 17 Dec	Asiana Airlines
01 Dec - 24 Dec	United
08 Dec - 14 Dec	Asiana Airlines
05 Dec - 12 Dec	Asiana Airlines
07 Dec - 15 Dec	United
06 Dec - 22 Dec	Asiana Airlines
02 Dec - 23 Dec	Korean Air
27 Dec - 14 Jan	Asiana Airlines
06 Dec - 12 Jan	Asiana Airlines
27 Dec - 12 Jan	Asiana Airlines
02 Dec - 13 Jan	Korean Air
25 Dec - 26 Jan	Hawaiian Airlines

Also check the deals for one-way flights from San Francisco 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 Francisco to Bangkok in December from 595€

Return flights