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

Return flights

30 Jan - 20 Feb	Air Premia	direct
28 Jan - 18 Feb	Air Premia	direct
21 Jan - 28 Jan	United	direct
18 Jan - 30 Jan	United	direct
15 Jan - 22 Jan	United	direct
11 Jan - 31 Jan	United	direct
11 Jan - 23 Jan	United	direct
21 Jan - 18 Feb	United	direct
06 Jan - 27 Jan	United	direct
29 Jan - 02 Feb	United	direct
16 Jan - 19 Jan	United	direct
11 Jan - 18 Jan	United	direct
15 Jan - 17 Jan	Air Canada
15 Jan - 17 Jan	United	direct

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 $639

Return flights