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

Return flights

05 Dec - 12 Dec	Air Premia	direct
03 Dec - 20 Dec	Air Premia	direct
29 Dec - 21 Jan	Air Premia	direct
02 Dec - 09 Dec	United	direct
06 Dec - 27 Dec	United	direct
04 Dec - 07 Dec	United	direct
01 Dec - 09 Dec	United	direct
06 Dec - 13 Dec	United	direct
29 Dec - 22 Jan	United	direct
30 Dec - 21 Jan	United	direct
30 Dec - 22 Jan	United	direct
05 Dec - 21 Dec	United	direct
05 Dec - 13 Dec	United	direct
13 Dec - 24 Dec	Hawaiian Airlines
11 Dec - 23 Jan	United	direct
31 Dec - 13 Jan	Delta
31 Dec - 13 Jan	Air Premia	direct
08 Dec - 12 Jan	Air Premia	direct
11 Dec - 10 Jan	Air Canada
12 Dec - 31 Jan	Delta

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 559€

Return flights