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

Return flights

31 Dec - 28 Jan	Air Premia	direct
31 Dec - 26 Jan	Air Premia	direct
30 Dec - 24 Jan	Air India
27 Dec - 31 Jan	Air Premia	direct
30 Dec - 24 Jan	Korean Air	direct
27 Dec - 14 Jan	Air Premia	direct
24 Dec - 14 Jan	Air Premia	direct
26 Dec - 23 Jan	Korean Air	direct
29 Dec - 19 Jan	Air Canada
24 Dec - 21 Jan	Air Premia	direct
26 Dec - 28 Dec	United	direct
25 Dec - 28 Dec	United	direct
26 Dec - 30 Dec	Korean Air
27 Dec - 30 Dec	Korean Air
25 Dec - 30 Dec	Delta
24 Dec - 27 Dec	Delta
24 Dec - 28 Dec	Delta
24 Dec - 27 Dec	United	direct
24 Dec - 29 Dec	United	direct
24 Dec - 28 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 557€

Return flights