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

Return flights

29 Apr - 15 May	AirAsia X
29 Apr - 14 May	AirAsia X
28 Apr - 15 May	AirAsia X
28 Apr - 14 May	AirAsia X
15 Apr - 27 Apr	AirAsia X
22 Apr - 27 Apr	Thai AirAsia X
28 Apr - 28 Apr	AirAsia X
15 Apr - 28 Apr	AirAsia X
15 Apr - 18 Apr	AirAsia X
01 Apr - 18 Apr	Thai AirAsia X
02 Apr - 18 Apr	Thai AirAsia X
01 Apr - 05 Apr	Thai AirAsia X
02 Apr - 05 Apr	Thai AirAsia X
29 Apr - 08 May	AirAsia X
28 Apr - 08 May	AirAsia X
30 Apr - 20 May	Thai AirAsia X
30 Apr - 15 May	Thai AirAsia X
30 Apr - 14 May	Thai AirAsia X
04 Apr - 18 Apr	Thai AirAsia X
29 Apr - 06 May	AirAsia X

Also check the deals for one-way flights from Seoul to Chiang Mai 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 Chiang Mai in April from $290

Return flights