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

Return flights

17 Dec - 30 Dec	Air Canada
10 Dec - 14 Jan	Air Canada
13 Dec - 31 Dec	Air Canada
12 Dec - 02 Jan	Air Canada
17 Dec - 25 Jan	Air Canada
12 Dec - 04 Jan	Air Canada
17 Dec - 24 Jan	Air Canada
17 Dec - 08 Jan	Air Canada
13 Dec - 03 Jan	Air Canada
13 Dec - 30 Dec	Air Canada
05 Dec - 29 Dec	Air Canada
07 Dec - 29 Dec	Air Canada
13 Dec - 29 Dec	Air Canada
17 Dec - 29 Dec	Air Canada
20 Dec - 26 Dec	Hawaiian Airlines
22 Dec - 27 Dec	Hawaiian Airlines
21 Dec - 11 Jan	United	direct
15 Dec - 28 Dec	United	direct
22 Dec - 03 Jan	United	direct
10 Dec - 14 Jan	United	direct

Also check the deals for one-way flights from Seoul to San Francisco 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 Seoul to San Francisco in December from 325€

Return flights