AirHint found the following cheapest return flights from San Juan (SJU) to Seoul (ICN) in December 2025 (see full year).
Return flights
| 08 Dec - 22 Dec | Delta | ||
| 09 Dec - 23 Dec | Frontier Airlines | ||
| 16 Dec - 29 Dec | Delta |
Also check the deals for one-way flights from San Juan to Seoul in December.
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