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

One-Way flights

15 Dec	Thai AirAsia	direct
14 Dec	Thai AirAsia	direct
05 Dec	Thai AirAsia	direct
16 Dec	Thai AirAsia	direct
08 Dec	Thai AirAsia	direct
10 Dec	Thai AirAsia	direct
26 Dec	Thai AirAsia	direct
28 Dec	Thai AirAsia	direct
30 Dec	Thai AirAsia	direct
24 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 107€

One-Way flights