AirHint found the following cheapest return flights from Louisville (SDF) to Seoul (ICN) in December 2025 (see full year).
Return flights
| 08 Dec - 17 Dec | American Airlines | ||
| 07 Dec - 14 Dec | Delta | ||
| 09 Dec - 28 Dec | Delta | ||
| 26 Dec - 31 Dec | American Airlines | ||
| 24 Dec - 30 Dec | Spirit Airlines | ||
| 13 Dec - 03 Jan | Aer Lingus |
Also check the deals for one-way flights from Louisville to Seoul in December.
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