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

Return flights

01 Dec - 10 Dec	Japan Airlines
01 Dec - 15 Dec	Japan Airlines
09 Dec - 21 Dec	ANA
29 Dec - 17 Jan	ANA
06 Dec - 28 Dec	ANA
14 Dec - 20 Dec	Japan Airlines
15 Dec - 28 Dec	ANA
27 Dec - 17 Jan	ANA
24 Dec - 19 Jan	ANA
17 Dec - 11 Jan	ANA
17 Dec - 08 Jan	Zipair
21 Dec - 31 Dec	ANA
21 Dec - 11 Jan	ANA
25 Dec - 07 Jan	ANA
16 Dec - 07 Jan	ANA
20 Dec - 18 Jan	ANA
23 Dec - 31 Dec	ANA
19 Dec - 17 Jan	Japan Airlines
22 Dec - 31 Dec	EVA Air
19 Dec - 31 Dec	ANA

Also check the deals for one-way flights from San Francisco to Seoul 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 Seoul in December from $854

Return flights