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

Return flights

03 Oct - 04 Nov	Thai Airways
03 Oct - 07 Nov	Thai Airways
03 Oct - 17 Oct	Thai Airways
13 Oct - 01 Nov	Thai Airways
02 Oct - 06 Oct	Thai Airways
18 Oct - 25 Oct	China Southern
03 Oct - 04 Nov	Korean Air	direct
08 Oct - 21 Oct	China Southern
08 Oct - 22 Oct	China Southern
10 Oct - 24 Oct	China Southern
18 Oct - 24 Oct	China Southern
03 Oct - 17 Oct	Korean Air	direct
10 Oct - 24 Oct	Korean Air	direct
13 Oct - 01 Nov	Korean Air	direct

Also check the deals for one-way flights from Kathmandu to Seoul in October.

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 Kathmandu to Seoul in October from $645

Return flights