AirHint found the following cheapest one-way flights from Seoul (ICN) to Osaka (KIX) in December 2025 (see full year).
One-Way flights
| 23 Dec | Air Seoul, Inc | direct | |
| 25 Dec | T'way Air | direct | |
| 22 Dec | Jeju Air | direct | |
| 30 Dec | Air Busan | direct | |
| 31 Dec | Peach | direct |
Also check the deals for return flights from Seoul to Osaka in December.
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