AirHint found the following cheapest return flights from Busan (PUS) to Chiang Mai (CNX) in September 2025 (see full year).

Return flights

11 Sep - 15 Sep	HK Express
17 Sep - 25 Sep	VietJet Air
08 Sep - 16 Sep	VietJet Air
17 Sep - 22 Sep	VietJet Air
14 Sep - 15 Sep	VietJet Air
14 Sep - 18 Sep	VietJet Air
12 Sep - 16 Sep	VietJet Air
14 Sep - 25 Sep	VietJet Air
17 Sep - 24 Sep	VietJet Air
08 Sep - 11 Sep	VietJet Air
21 Sep - 03 Oct	VietJet Air
29 Sep - 13 Oct	HK Express
29 Sep - 15 Oct	VietJet Air
13 Sep - 22 Oct	HK Express
11 Sep - 03 Oct	HK Express
28 Sep - 16 Oct	Eastar Jet	direct
04 Sep - 03 Oct	HK Express
25 Sep - 03 Oct	HK Express
28 Sep - 02 Oct	Eastar Jet	direct
29 Sep - 05 Oct	VietJet Air

Also check the deals for one-way flights from Busan to Chiang Mai in September.

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 Busan to Chiang Mai in September from 252€

Return flights