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

One-Way flights

14 Sep	Thai AirAsia	direct
30 Sep	Thai AirAsia	direct
13 Sep	Thai AirAsia	direct
16 Sep	Thai AirAsia	direct
10 Sep	Thai AirAsia	direct
07 Sep	Thai AirAsia	direct
20 Sep	Thai AirAsia	direct
17 Sep	Thai AirAsia	direct
08 Sep	Thai AirAsia	direct
18 Sep	Thai AirAsia	direct

Also check the deals for return flights from Colombo 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 Colombo to Bangkok in September from 127€

One-Way flights