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

Return flights

02 Dec - 09 Dec	Air China
04 Dec - 09 Dec	Air China
02 Dec - 13 Dec	Air China
17 Dec - 25 Dec	Air China
02 Dec - 11 Dec	Air China
04 Dec - 11 Dec	Air China
04 Dec - 13 Dec	Air China
07 Dec - 09 Dec	Air China
07 Dec - 11 Dec	Air China
07 Dec - 18 Dec	Air China
01 Dec - 19 Jan	China Eastern
26 Dec - 10 Jan	Air China
16 Dec - 07 Jan	China Eastern
13 Dec - 29 Jan	Air China
14 Dec - 30 Jan	Air China
12 Dec - 18 Jan	Air China
30 Dec - 30 Jan	Air China
26 Dec - 25 Jan	Air China
15 Dec - 25 Jan	Air China
22 Dec - 06 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 $245

Return flights