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

Return flights

28 Dec - 21 Jan	Air China
01 Dec - 27 Dec	Air China
02 Dec - 11 Dec	Air India
13 Dec - 03 Jan	Air India
11 Dec - 09 Jan	Air India
30 Dec - 03 Jan	Air India
27 Dec - 03 Jan	Air India
30 Dec - 10 Jan	Air India
23 Dec - 27 Dec	Air China
16 Dec - 20 Dec	Air India
20 Dec - 27 Dec	Air India
13 Dec - 19 Dec	Air India
03 Dec - 06 Dec	Air China
05 Dec - 31 Dec	Air China
06 Dec - 10 Dec	Air India
20 Dec - 02 Jan	Air India
20 Dec - 22 Jan	Air India
16 Dec - 16 Jan	Air India
01 Dec - 11 Dec	Air China
08 Dec - 07 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 468€

Return flights