AirHint found the following cheapest one-way flights from Chiang Mai (CNX) to Bangkok (BKK) in September 2025 (see full year).

One-Way flights

30 Sep	Thai VietJet Air	direct
24 Sep	Thai VietJet Air	direct
25 Sep	Thai VietJet Air	direct
17 Sep	Thai VietJet Air	direct
18 Sep	Thai VietJet Air	direct
11 Sep	Thai VietJet Air	direct
23 Sep	Thai VietJet Air	direct
03 Sep	Thai VietJet Air	direct
02 Sep	Thai VietJet Air	direct
04 Sep	Thai VietJet Air	direct

Also check the deals for return flights from Chiang Mai to Bangkok 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 one-way flights from Chiang Mai to Bangkok in September from $9

One-Way flights