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

Return flights

04 Sep - 10 Sep	Thai AirAsia
04 Sep - 06 Sep	Thai AirAsia
04 Sep - 20 Sep	Thai AirAsia
17 Sep - 20 Sep	Thai AirAsia
16 Sep - 20 Sep	Thai AirAsia
17 Sep - 04 Oct	Thai AirAsia
16 Sep - 04 Oct	Thai AirAsia
17 Sep - 03 Oct	Thai AirAsia
16 Sep - 03 Oct	Thai AirAsia
09 Sep - 20 Sep	Thai AirAsia
12 Sep - 20 Sep	Thai AirAsia
06 Sep - 10 Sep	Thai AirAsia
12 Sep - 03 Oct	Thai AirAsia
06 Sep - 20 Sep	Thai AirAsia
04 Sep - 13 Sep	Thai AirAsia
15 Sep - 04 Oct	Thai AirAsia
15 Sep - 03 Oct	Thai AirAsia
13 Sep - 04 Oct	Thai AirAsia
13 Sep - 03 Oct	Thai AirAsia

Also check the deals for one-way flights from Chiang Mai to Kolkata 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 Kolkata in September from $265

Return flights