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

Return flights

20 May - 31 May	SriLankan Airlines
05 May - 19 May	Vietnam Airlines
23 May - 02 Jun	Air China
06 May - 05 Jun	Air China
03 May - 09 May	Air India
02 May - 09 May	Air India
05 May - 23 May	Air India
19 May - 30 May	Singapore Airlines
26 May - 30 May	Singapore Airlines
03 May - 10 May	China Southern
19 May - 30 May	Korean Air	direct
26 May - 30 May	Korean Air	direct
23 May - 02 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 318€

Return flights