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

Return flights

27 Dec - 29 Jan	Air India
30 Dec - 30 Jan	Air India
28 Dec - 11 Jan	Air India
27 Dec - 12 Jan	Air India
30 Dec - 11 Jan	Air India
29 Dec - 29 Jan	Air India
29 Dec - 28 Jan	Asiana Airlines
29 Dec - 12 Jan	Air India
31 Dec - 19 Jan	Asiana Airlines
31 Dec - 15 Jan	Air India
26 Dec - 28 Dec	Air India
23 Dec - 26 Dec	Air India
14 Dec - 26 Dec	Air India
15 Dec - 21 Dec	Philippine Airlines
17 Dec - 19 Dec	Air India
15 Dec - 26 Dec	ANA
14 Dec - 18 Dec	ANA
17 Dec - 24 Dec	Air India
24 Dec - 27 Dec	Air India
16 Dec - 24 Dec	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 $711

Return flights