AirHint found the following cheapest return flights from Seoul (ICN) to Kathmandu (KTM) in December 2025 (see full year).

Return flights

16 Dec - 23 Dec	Air China
01 Dec - 06 Dec	Air China
01 Dec - 09 Dec	Air China
01 Dec - 16 Dec	Air China
02 Dec - 16 Dec	Air China
03 Dec - 09 Dec	Air China
03 Dec - 11 Dec	Air China
03 Dec - 18 Dec	Air China
05 Dec - 11 Dec	Air China
05 Dec - 16 Dec	Air China
13 Dec - 13 Jan	China Eastern
14 Dec - 14 Jan	China Eastern
05 Dec - 19 Jan	China Eastern
17 Dec - 14 Jan	Air China
16 Dec - 14 Jan	Air China
15 Dec - 14 Jan	Air China
29 Dec - 11 Jan	Air China
09 Dec - 06 Jan	Air China
30 Dec - 17 Jan	Air China
13 Dec - 11 Jan	Air China

Also check the deals for one-way flights from Seoul to Kathmandu in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Seoul to Kathmandu in December from 223€

Return flights