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

Return flights

30 Dec - 28 Jan	China Southern
29 Dec - 15 Jan	Air China
23 Dec - 24 Jan	Air China
25 Dec - 01 Jan	China Southern
23 Dec - 15 Jan	Air China
26 Dec - 31 Dec	Air China
27 Dec - 03 Jan	China Southern
26 Dec - 02 Jan	Air India
24 Dec - 04 Jan	SriLankan Airlines
30 Dec - 03 Jan	Air India
27 Dec - 31 Dec	Air India
27 Dec - 02 Jan	Air India
27 Dec - 29 Dec	Air India
26 Dec - 29 Dec	Air India
23 Dec - 26 Dec	Air China
25 Dec - 31 Dec	Air India
22 Dec - 25 Dec	Thai Airways
25 Dec - 29 Dec	Air India
23 Dec - 29 Dec	Air India
24 Dec - 29 Dec	Thai Airways

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 346€

Return flights