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	HK Express
05 Dec - 08 Dec	HK Express
06 Dec - 13 Dec	HK Express
23 Dec - 13 Jan	Jin Air
05 Dec - 13 Dec	HK Express
06 Dec - 15 Dec	Thai AirAsia
24 Dec - 13 Jan	Jin Air
01 Dec - 02 Dec	Jin Air
01 Dec - 15 Dec	Jin Air
11 Dec - 15 Dec	Jin Air
06 Dec - 23 Dec	Thai AirAsia
06 Dec - 07 Dec	Thai AirAsia
25 Dec - 15 Jan	Eastar Jet
25 Dec - 13 Jan	Eastar Jet
17 Dec - 07 Jan	Thai AirAsia
18 Dec - 07 Jan	Thai AirAsia
19 Dec - 07 Jan	Jin Air
16 Dec - 05 Jan	Thai AirAsia
17 Dec - 05 Jan	Thai AirAsia
12 Dec - 05 Jan	HK Express

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 276€

Return flights