AirHint found the following cheapest return flights from Chiang Mai (CNX) to Seoul (ICN) in December 2025 (see full year).

Return flights

12 Dec - 16 Dec	Thai AirAsia
12 Dec - 15 Dec	Thai AirAsia
12 Dec - 18 Dec	Thai AirAsia
09 Dec - 16 Dec	Thai AirAsia
09 Dec - 15 Dec	Thai AirAsia
09 Dec - 18 Dec	Thai AirAsia
02 Dec - 16 Dec	Thai AirAsia
18 Dec - 07 Jan	Thai AirAsia
01 Dec - 03 Dec	Thai AirAsia
01 Dec - 16 Dec	Thai AirAsia
04 Dec - 16 Dec	Jin Air
18 Dec - 08 Jan	Thai AirAsia
24 Dec - 13 Jan	Thai AirAsia
18 Dec - 05 Jan	Thai AirAsia
24 Dec - 14 Jan	Thai AirAsia
28 Dec - 14 Jan	Thai AirAsia
28 Dec - 16 Jan	Thai AirAsia
15 Dec - 05 Jan	Thai AirAsia
24 Dec - 07 Jan	Thai AirAsia
24 Dec - 11 Jan	Thai AirAsia

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

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 December from $337

Return flights