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

Return flights

17 Aug - 26 Aug	Thai AirAsia
06 Aug - 12 Aug	Thai AirAsia
06 Aug - 26 Aug	Thai AirAsia
19 Aug - 26 Aug	Thai AirAsia
24 Aug - 26 Aug	Thai AirAsia
08 Aug - 12 Aug	Thai AirAsia
08 Aug - 26 Aug	Thai AirAsia
15 Aug - 26 Aug	Thai AirAsia
16 Aug - 26 Aug	Thai AirAsia
17 Aug - 22 Aug	Thai AirAsia

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

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 August from $483

Return flights