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

Return flights

19 Oct - 23 Oct	Vietnam Airlines
16 Oct - 28 Oct	Vietnam Airlines
22 Oct - 30 Oct	Vietnam Airlines
17 Oct - 21 Oct	Vietnam Airlines
22 Oct - 27 Oct	Vietnam Airlines
17 Oct - 19 Oct	Vietnam Airlines
29 Oct - 04 Nov	Vietnam Airlines
31 Oct - 02 Nov	Vietnam Airlines
09 Oct - 13 Oct	VietJet Air
13 Oct - 16 Oct	HK Express
12 Oct - 16 Oct	HK Express
14 Oct - 16 Oct	HK Express
15 Oct - 12 Nov	HK Express
23 Oct - 06 Nov	VietJet Air
14 Oct - 14 Nov	HK Express
30 Oct - 03 Nov	HK Express
28 Oct - 05 Nov	VietJet Air
31 Oct - 30 Nov	VietJet Air
31 Oct - 05 Nov	VietJet Air
30 Oct - 09 Nov	Air China

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

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 October from $213

Return flights