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

Return flights

01 Dec - 08 Dec	Air China
02 Dec - 09 Dec	Air China
01 Dec - 10 Dec	Air China
01 Dec - 04 Dec	Air China
01 Dec - 07 Dec	Air China
01 Dec - 09 Dec	Air China
01 Dec - 11 Dec	Air China
01 Dec - 14 Dec	Air China
01 Dec - 15 Dec	Air China
01 Dec - 16 Dec	Air China
18 Dec - 04 Jan	China Southern
27 Dec - 26 Jan	Air China
26 Dec - 25 Jan	Air China
30 Dec - 17 Jan	Air China
09 Dec - 08 Jan	China Southern
18 Dec - 01 Jan	China Southern
06 Dec - 05 Jan	China Southern
18 Dec - 02 Jan	China Southern
24 Dec - 02 Jan	Air China
21 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.

Book a cheap hotel in Kathmandu

Cheap car rent in Kathmandu

Cheapest return flights from Seoul to Kathmandu in December from 266€

Return flights