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

One-Way flights

04 Dec	Thai AirAsia	direct
08 Dec	Thai AirAsia	direct
14 Dec	Thai AirAsia	direct
06 Dec	Thai AirAsia	direct
05 Dec	Thai AirAsia	direct
11 Dec	Thai AirAsia	direct
03 Dec	Thai AirAsia	direct
17 Dec	Thai AirAsia	direct
02 Dec	Thai AirAsia	direct
22 Dec	Thai AirAsia	direct

Also check the deals for return flights from Bangkok to Colombo in December.

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 December from $129

One-Way flights