AirHint found the following cheapest return flights from Chiang Mai (CNX) to Colombo (CMB) in August 2025 (see full year).

Return flights

28 Aug - 04 Sep	Thai AirAsia
30 Aug - 31 Aug	Thai AirAsia
06 Aug - 23 Aug	Thai AirAsia
06 Aug - 20 Aug	Thai AirAsia
30 Aug - 02 Sep	Thai AirAsia
30 Aug - 01 Sep	Thai AirAsia
06 Aug - 26 Aug	Thai AirAsia
28 Aug - 31 Aug	Thai AirAsia
28 Aug - 30 Aug	Thai AirAsia
28 Aug - 02 Sep	Thai AirAsia
30 Aug - 04 Sep	Thai AirAsia
28 Aug - 01 Sep	Thai AirAsia
20 Aug - 31 Aug	Thai AirAsia
20 Aug - 23 Aug	Thai AirAsia
20 Aug - 30 Aug	Thai AirAsia
20 Aug - 02 Sep	Thai AirAsia
20 Aug - 01 Sep	Thai AirAsia
20 Aug - 26 Aug	Thai AirAsia
20 Aug - 04 Sep	Thai AirAsia
30 Aug - 03 Sep	Thai AirAsia

Also check the deals for one-way flights from Chiang Mai to Colombo in August.

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 Colombo in August from $385

Return flights