AirHint found the following cheapest return flights from Seoul (ICN) to Kathmandu (KTM) in September 2026 (see full year).

Return flights

29 Sep - 13 Oct	China Southern
29 Sep - 20 Oct	China Southern
19 Sep - 22 Sep	Air China
26 Sep - 10 Oct	Air China
12 Sep - 10 Oct	Thai Airways
22 Sep - 30 Sep	Air India
22 Sep - 01 Oct	Air India
29 Sep - 10 Oct	Thai Airways
22 Sep - 29 Sep	Thai Airways
29 Sep - 13 Oct	Korean Air	direct
29 Sep - 20 Oct	Korean Air	direct
12 Sep - 10 Oct	Korean Air	direct
29 Sep - 10 Oct	Korean Air	direct
19 Sep - 22 Sep	Korean Air	direct
22 Sep - 29 Sep	Korean Air	direct

Also check the deals for one-way flights from Seoul to Kathmandu 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 return flights from Seoul to Kathmandu in September from $567

Return flights