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

Return flights

01 Dec - 10 Jan	China Southern
27 Dec - 12 Jan	Air India
28 Dec - 02 Jan	China Eastern
06 Dec - 10 Dec	Air India
27 Dec - 22 Jan	Air India
20 Dec - 27 Dec	Air India
14 Dec - 29 Dec	Air India
27 Dec - 10 Jan	Air India
28 Dec - 22 Jan	Air India
27 Dec - 03 Jan	Air India
05 Dec - 31 Dec	Air India
02 Dec - 06 Dec	Air India
30 Dec - 03 Jan	Air India
16 Dec - 03 Jan	Air India
02 Dec - 11 Dec	Air India
19 Dec - 27 Dec	Air India
07 Dec - 07 Jan	Air India
09 Dec - 13 Dec	Air India
04 Dec - 08 Dec	Air India
05 Dec - 08 Dec	Air India

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 374€

Return flights