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

Return flights

01 Dec - 30 Jan	China Southern
17 Dec - 28 Jan	Air China
15 Dec - 31 Dec	Air China
15 Dec - 25 Jan	Air China
18 Dec - 28 Jan	Air China
15 Dec - 05 Jan	China Eastern
23 Dec - 26 Jan	China Southern
23 Dec - 27 Jan	China Southern
31 Dec - 08 Jan	China Southern
12 Dec - 09 Jan	China Southern
13 Dec - 10 Jan	China Southern
09 Dec - 30 Dec	China Southern
17 Dec - 27 Dec	China Eastern
01 Dec - 20 Dec	China Eastern
15 Dec - 22 Dec	China Eastern
19 Dec - 30 Dec	Air China
17 Dec - 26 Dec	Air China
05 Dec - 31 Dec	Air China
18 Dec - 31 Dec	Air China
18 Dec - 26 Dec	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 $376

Return flights