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

Return flights

03 Dec - 05 Dec	Air Canada
01 Dec - 05 Dec	Air Canada
11 Dec - 29 Dec	Air Canada
11 Dec - 30 Dec	Air Canada
01 Dec - 31 Dec	Air Canada
12 Dec - 28 Dec	Air Canada
03 Dec - 06 Dec	Air Canada
03 Dec - 07 Dec	Air Canada
04 Dec - 06 Dec	Air Canada
04 Dec - 07 Dec	Air Canada
09 Dec - 03 Jan	Air Canada
26 Dec - 07 Jan	Air Premia	direct
28 Dec - 04 Jan	Air Premia	direct
21 Dec - 05 Jan	Air Premia	direct
21 Dec - 04 Jan	Air Premia	direct
29 Dec - 07 Jan	Air Premia	direct
26 Dec - 04 Jan	Air Premia	direct
24 Dec - 02 Jan	United	direct
19 Dec - 02 Jan	United	direct
21 Dec - 02 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 382€

Return flights