AirHint found the following cheapest return flights from San Francisco (SFO) to Seoul (ICN) in January 2026 (see full year).

Return flights

15 Jan - 29 Jan	Alaska Airlines
16 Jan - 25 Jan	Alaska Airlines
28 Jan - 02 Feb	Air Premia	direct
22 Jan - 06 Feb	Alaska Airlines
28 Jan - 28 Feb	Alaska Airlines
06 Jan - 27 Jan	United	direct
17 Jan - 31 Jan	United	direct
18 Jan - 30 Jan	United	direct
21 Jan - 28 Jan	United	direct
16 Jan - 25 Jan	United	direct
22 Jan - 06 Feb	United	direct
28 Jan - 28 Feb	United	direct
14 Jan - 16 Feb	Alaska Airlines
07 Jan - 14 Jan	United	direct
05 Jan - 19 Jan	Cathay Pacific
03 Jan - 16 Jan	Air Premia	direct
08 Jan - 01 Feb	Air France

Also check the deals for one-way flights from San Francisco to Seoul in January.

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 January from $654

Return flights