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

Return flights

14 Mar - 28 Mar	Thai AirAsia
18 Mar - 25 Mar	Thai AirAsia
25 Mar - 30 Mar	Thai AirAsia
21 Mar - 28 Mar	Thai AirAsia
24 Mar - 28 Mar	Thai AirAsia
27 Mar - 31 Mar	Thai AirAsia
04 Mar - 05 Mar	Thai AirAsia
29 Mar - 02 Apr	Thai AirAsia
28 Mar - 01 Apr	Thai AirAsia
28 Mar - 04 Apr	Thai AirAsia
13 Mar - 21 Mar	Eastar Jet	direct
13 Mar - 15 Mar	Eastar Jet	direct
13 Mar - 24 Mar	Eastar Jet	direct
21 Mar - 03 Apr	China Southern
20 Mar - 03 Apr	China Southern
22 Mar - 03 Apr	China Southern

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

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 March from 213€

Return flights