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

Return flights

28 Dec - 19 Jan	United	direct
10 Dec - 17 Dec	Air Premia	direct
27 Dec - 15 Jan	Delta
12 Dec - 21 Dec	Air Premia	direct
12 Dec - 29 Dec	United	direct
28 Dec - 14 Jan	United	direct
10 Dec - 14 Jan	United	direct
10 Dec - 12 Jan	United	direct
27 Dec - 15 Jan	United	direct
28 Dec - 13 Jan	United	direct
12 Dec - 09 Jan	United	direct
11 Dec - 09 Jan	United	direct
14 Dec - 20 Dec	Delta
22 Dec - 29 Dec	Air Premia	direct
24 Dec - 07 Jan	United	direct
14 Dec - 20 Dec	United	direct
15 Dec - 22 Dec	United	direct
14 Dec - 29 Dec	United	direct
15 Dec - 31 Dec	United	direct
23 Dec - 31 Dec	United	direct

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 657€

Return flights