AirHint found the following cheapest one-way flights from Bangkok (DMK) to Colombo (CMB) in September 2025 (see full year).

One-Way flights

03 Sep	Thai AirAsia	direct
04 Sep	Thai AirAsia	direct
17 Sep	Thai AirAsia	direct
22 Sep	Thai AirAsia	direct
20 Sep	Thai AirAsia	direct
05 Sep	Thai AirAsia	direct
23 Sep	Thai AirAsia	direct
12 Sep	Thai AirAsia	direct
11 Sep	Thai AirAsia	direct
29 Sep	Thai AirAsia	direct

Also check the deals for return flights from Bangkok to Colombo 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 Bangkok to Colombo in September from 104€

One-Way flights