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

Return flights

24 Apr - 07 May	Thai AirAsia
24 Apr - 29 Apr	Thai AirAsia
20 Apr - 07 May	Thai AirAsia
24 Apr - 12 May	Thai AirAsia
24 Apr - 15 May	Thai AirAsia
24 Apr - 13 May	Thai AirAsia
18 Apr - 07 May	Thai AirAsia
20 Apr - 29 Apr	Thai AirAsia
20 Apr - 25 Apr	Thai AirAsia
01 Apr - 16 Apr	Thai AirAsia
24 Apr - 06 May	Thai AirAsia
24 Apr - 30 Apr	Thai AirAsia
18 Apr - 29 Apr	Thai AirAsia
18 Apr - 25 Apr	Thai AirAsia
16 Apr - 07 May	Thai AirAsia
30 Apr - 07 May	Thai AirAsia
20 Apr - 24 Apr	Thai AirAsia
20 Apr - 06 May	Thai AirAsia
20 Apr - 30 Apr	Thai AirAsia
01 Apr - 20 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.

Book a cheap hotel in Seoul

Cheap car rent in Seoul

Cheapest return flights from Chiang Mai to Seoul in April from $244

Return flights