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

Return flights

11 Dec - 26 Dec	Air China
07 Dec - 25 Dec	Air China
11 Dec - 17 Dec	Air China
11 Dec - 20 Dec	Air China
11 Dec - 23 Dec	Air China
11 Dec - 25 Dec	Air China
16 Dec - 26 Dec	Air China
16 Dec - 27 Dec	Air China
16 Dec - 20 Dec	Air China
16 Dec - 25 Dec	Air China
28 Dec - 01 Jan	Air China
28 Dec - 09 Jan	Air China
30 Dec - 09 Jan	Air China
30 Dec - 14 Jan	Air China
31 Dec - 09 Jan	Air China
23 Dec - 01 Jan	Air China
23 Dec - 21 Jan	Air China
31 Dec - 04 Jan	SriLankan Airlines
24 Dec - 04 Jan	SriLankan Airlines
23 Dec - 04 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 252€

Return flights