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

Return flights

03 Dec - 10 Dec	Asiana Airlines
03 Dec - 17 Dec	Asiana Airlines
01 Dec - 08 Dec	ANA
07 Dec - 18 Dec	ANA
10 Dec - 23 Dec	Delta
27 Dec - 29 Jan	Asiana Airlines
26 Dec - 10 Jan	Asiana Airlines
29 Dec - 09 Jan	Asiana Airlines
02 Dec - 30 Dec	Air Canada
26 Dec - 09 Jan	Asiana Airlines
23 Dec - 13 Jan	Delta
18 Dec - 25 Dec	Asiana Airlines
18 Dec - 29 Dec	Air India
10 Dec - 01 Jan	China Airlines
21 Dec - 11 Jan	Delta
26 Dec - 04 Jan	EVA Air
11 Dec - 04 Jan	EVA Air
18 Dec - 31 Dec	EVA Air
11 Dec - 03 Jan	China 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 680€

Return flights