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

Return flights

25 Sep - 28 Sep	Thai AirAsia
29 Sep - 06 Oct	Thai Lion Air
22 Sep - 24 Sep	Thai VietJet Air
18 Sep - 21 Sep	Thai VietJet Air
03 Sep - 10 Sep	Thai AirAsia
24 Sep - 27 Sep	Thai VietJet Air
25 Sep - 27 Sep	Thai VietJet Air
17 Sep - 24 Sep	Thai VietJet Air
27 Sep - 29 Sep	Thai AirAsia
07 Sep - 10 Sep	Thai VietJet Air
25 Sep - 25 Sep	Thai AirAsia
28 Sep - 08 Oct	Thai AirAsia
26 Sep - 08 Oct	Thai AirAsia
20 Sep - 08 Oct	Thai AirAsia
17 Sep - 08 Oct	Thai AirAsia
23 Sep - 08 Oct	Thai AirAsia
24 Sep - 08 Oct	Thai AirAsia
29 Sep - 08 Oct	Thai AirAsia
19 Sep - 08 Oct	Thai AirAsia
25 Sep - 08 Oct	Thai AirAsia

Also check the deals for one-way flights from Chiang Mai to Singapore 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 Chiang Mai to Singapore in September from 132€

Return flights