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

Return flights

05 May - 24 May	AirAsia X
05 May - 21 May	AirAsia X
21 May - 25 May	AirAsia X
21 May - 24 May	AirAsia X
21 May - 21 May	AirAsia X
14 May - 25 May	AirAsia X
14 May - 19 May	AirAsia X
14 May - 20 May	AirAsia X
14 May - 24 May	AirAsia X
14 May - 21 May	AirAsia X
21 May - 10 Jun	AirAsia X
25 May - 12 Jun	Thai AirAsia X
25 May - 14 Jun	Thai AirAsia X
25 May - 10 Jun	Thai AirAsia X
26 May - 12 Jun	Thai AirAsia X
26 May - 14 Jun	Thai AirAsia X
26 May - 10 Jun	Thai AirAsia X
26 May - 15 Jun	Thai AirAsia X
27 May - 12 Jun	Thai AirAsia X
27 May - 14 Jun	Thai AirAsia X

Also check the deals for one-way flights from Seoul to Chiang Mai in May.

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 May from $290

Return flights