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

Return flights

02 Dec - 07 Dec	AirAsia
08 Dec - 16 Dec	Eastar Jet
01 Dec - 08 Dec	HK Express
04 Dec - 15 Dec	HK Express
04 Dec - 09 Dec	HK Express
05 Dec - 10 Dec	HK Express
08 Dec - 10 Dec	Eastar Jet	direct
08 Dec - 09 Dec	Eastar Jet	direct
04 Dec - 08 Dec	HK Express
10 Dec - 16 Dec	Eastar Jet
11 Dec - 05 Jan	HK Express
16 Dec - 18 Jan	HK Express
24 Dec - 04 Jan	Spring Airlines
25 Dec - 04 Jan	Air China
19 Dec - 10 Jan	Air China
11 Dec - 02 Jan	HK Express
11 Dec - 03 Jan	HK Express
10 Dec - 03 Jan	China Airlines
10 Dec - 04 Jan	China Airlines
28 Dec - 04 Jan	China Airlines

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 235€

Return flights