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
25 May - 29 May	Air China
13 May - 19 May	Air China
20 May - 26 May	Air China
16 May - 02 Jun	Air China
13 May - 18 May	Thai AirAsia X
29 May - 06 Jun	China Southern
11 May - 25 May	Thai AirAsia X
19 May - 25 May	Thai AirAsia X
09 May - 23 May	Air China
13 May - 27 May	Thai AirAsia X
25 May - 30 May	Air China
30 May - 06 Jun	Air China
15 May - 14 Jun	China Southern
01 May - 26 Jun	China Southern
30 May - 06 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 297€

Return flights