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

Return flights

16 Apr - 21 Apr	Bangkok Airways
02 Apr - 05 Apr	Thai AirAsia
20 Apr - 27 Apr	Thai AirAsia
22 Apr - 28 Apr	Thai AirAsia
06 Apr - 11 May	Thai AirAsia
27 Apr - 28 Apr	Thai AirAsia
04 Apr - 08 Apr	Thai AirAsia
30 Apr - 04 May	Thai VietJet Air
27 Apr - 30 Apr	Thai AirAsia
12 Apr - 21 Apr	Thai AirAsia
16 Apr - 20 Apr	Thai AirAsia
17 Apr - 22 Apr	Thai AirAsia
13 Apr - 11 May	Thai AirAsia
11 Apr - 12 May	Thai AirAsia
11 Apr - 11 May	Thai AirAsia

Also check the deals for one-way flights from Chiang Mai to Seoul 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 Chiang Mai to Seoul in April from $242

Return flights