AirHint found the following cheapest return flights from Kathmandu (KTM) to Seoul (ICN) in August 2025 (see full year).

Return flights

28 Aug - 31 Aug	Thai Lion Air
29 Aug - 01 Sep	Thai AirAsia
16 Aug - 23 Aug	Himalaya Airlines
31 Aug - 07 Sep	Air China
08 Aug - 11 Aug	China Southern
10 Aug - 13 Aug	China Southern
10 Aug - 14 Aug	China Southern
15 Aug - 22 Aug	Air India
25 Aug - 01 Sep	Thai AirAsia
09 Aug - 20 Aug	Air China
11 Aug - 22 Aug	Thai AirAsia
25 Aug - 31 Aug	Thai AirAsia
11 Aug - 15 Aug	Cathay Pacific
31 Aug - 12 Sep	Cathay Pacific
25 Aug - 01 Sep	Korean Air	direct
18 Aug - 08 Sep	China Southern
29 Aug - 01 Sep	Korean Air	direct

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

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 Kathmandu to Seoul in August from 398€

Return flights