AirHint found the following cheapest one-way flights from Kathmandu (KTM) to Seoul (ICN) in September 2025 (see full year).

One-Way flights

30 Sep	Thai Lion Air
24 Sep	Thai AirAsia
25 Sep	Thai AirAsia
29 Sep	SriLankan Airlines
26 Sep	Thai AirAsia
23 Sep	Thai Lion Air
21 Sep	Thai Lion Air
22 Sep	Thai AirAsia
28 Sep	Thai AirAsia
29 Sep	Korean Air	direct

Also check the deals for return flights from Kathmandu to Seoul in September.

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 one-way flights from Kathmandu to Seoul in September from $190

One-Way flights