AirHint found the following cheapest return flights from Seoul (ICN) to San Jose (SJO) in December 2025 (see full year).
Return flights
| 21 Dec - 16 Jan | T'way Air | ||
| 22 Dec - 29 Dec | Air France | ||
| 18 Dec - 01 Jan | Air Canada | ||
| 18 Dec - 02 Jan | Air France | ||
| 19 Dec - 02 Jan | KLM | ||
| 13 Dec - 21 Dec | Delta |
Also check the deals for one-way flights from Seoul to San Jose in December.
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