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

Return flights

10 Mar - 16 Mar	Thai VietJet Air
12 Mar - 16 Mar	Thai VietJet Air
01 Mar - 21 Mar	AirAsia X
26 Mar - 27 Mar	Eastar Jet	direct
06 Mar - 21 Mar	AirAsia X
15 Mar - 18 Mar	Thai VietJet Air
02 Mar - 09 Mar	Thai VietJet Air
01 Mar - 13 Mar	AirAsia X
01 Mar - 12 Mar	AirAsia X
01 Mar - 19 Mar	AirAsia X
25 Mar - 08 Apr	Singapore Airlines
26 Mar - 04 Apr	Eastar Jet
27 Mar - 04 Apr	Eastar Jet
27 Mar - 16 Apr	Eastar Jet
26 Mar - 08 Apr	Eastar Jet
27 Mar - 08 Apr	Eastar Jet
26 Mar - 12 Apr	Eastar Jet
27 Mar - 12 Apr	Eastar Jet
26 Mar - 16 Apr	Eastar Jet
15 Mar - 04 Apr	AirAsia X

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

Book a cheap hotel in Chiang Mai

Cheap car rent in Chiang Mai

Cheapest return flights from Seoul to Chiang Mai in March from $198

Return flights