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

Return flights

26 Apr - 06 May	Thai AirAsia
24 Apr - 06 May	Thai AirAsia
27 Apr - 06 May	Thai AirAsia
28 Apr - 06 May	Thai AirAsia
23 Apr - 06 May	Thai AirAsia
21 Apr - 06 May	Thai AirAsia
21 Apr - 23 Apr	Thai AirAsia
26 Apr - 14 May	Thai AirAsia
24 Apr - 14 May	Thai AirAsia
27 Apr - 14 May	Thai AirAsia
28 Apr - 14 May	Thai AirAsia
20 Apr - 23 Apr	Thai AirAsia
21 Apr - 24 Apr	Thai AirAsia
16 Apr - 20 Apr	Thai Lion Air
16 Apr - 22 Apr	Thai Lion Air
17 Apr - 21 Apr	Thai Lion Air
18 Apr - 20 Apr	Thai AirAsia
18 Apr - 23 Apr	Thai AirAsia
03 Apr - 20 Apr	Thai AirAsia
03 Apr - 23 Apr	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 226€

Return flights