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

Return flights

13 May - 24 May	SriLankan Airlines
20 May - 31 May	SriLankan Airlines
28 May - 02 Jun	Malaysia Airlines
23 May - 09 Jun	Air China
29 May - 06 Jun	Air China
05 May - 09 May	Air India
26 May - 30 May	China Southern
19 May - 30 May	China Southern
21 May - 26 May	China Southern
02 May - 18 Jun	Air India
01 May - 09 May	Air India
09 May - 19 May	Singapore Airlines
11 May - 18 May	China Southern
01 May - 05 May	Thai Airways
23 May - 09 Jun	Korean Air	direct

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

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 May from 311€

Return flights