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

Return flights

02 Dec - 23 Dec	Singapore Airlines
01 Dec - 15 Dec	China Eastern
01 Dec - 24 Dec	China Eastern
08 Dec - 24 Dec	Asiana Airlines
08 Dec - 15 Dec	Asiana Airlines
08 Dec - 25 Dec	Asiana Airlines
04 Dec - 25 Dec	Asiana Airlines
01 Dec - 13 Dec	China Eastern
03 Dec - 24 Dec	Asiana Airlines
26 Dec - 22 Jan	Singapore Airlines
25 Dec - 10 Jan	Asiana Airlines
25 Dec - 11 Jan	Asiana Airlines
28 Dec - 09 Jan	Asiana Airlines
26 Dec - 11 Jan	Asiana Airlines
26 Dec - 09 Jan	Asiana Airlines
12 Dec - 25 Dec	Cathay Pacific
23 Dec - 13 Jan	Alaska Airlines
06 Dec - 01 Jan	Asiana Airlines
24 Dec - 11 Jan	Asiana Airlines
18 Dec - 10 Jan	Flair 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 $573

Return flights