AirHint found the following cheapest return flights from Kathmandu (KTM) to Seoul (ICN) in December 2025 (see full year).
Return flights
| 03 Dec - 10 Dec | Thai Lion Air | ||
| 30 Dec - 03 Jan | China Southern | ||
| 31 Dec - 04 Jan | China Southern | ||
| 30 Dec - 03 Jan | Korean Air | direct |
Also check the deals for one-way flights from Kathmandu to Seoul in December.
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