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

Return flights

18 Apr - 24 Apr	Air China
01 Apr - 08 Apr	Air China
07 Apr - 28 Apr	Vietnam Airlines
15 Apr - 29 Apr	SriLankan Airlines
21 Apr - 25 Apr	Air China
11 Apr - 17 Apr	Air China
11 Apr - 18 Apr	Air China
30 Apr - 06 May	Air China
30 Apr - 04 May	Air China
30 Apr - 09 May	Air China
21 Apr - 25 Apr	Korean Air	direct
11 Apr - 18 Apr	Korean Air	direct
04 Apr - 11 Apr	Korean Air	direct

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

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 April from $543

Return flights