AirHint found the following cheapest return flights from Sihanoukville (KOS) to Bangkok (BKK) in December 2025 (see full year).

Return flights

01 Dec - 09 Dec	AirAsia
08 Dec - 26 Dec	Air Cambodia
06 Dec - 09 Dec	AirAsia Cambodia
01 Dec - 12 Dec	AirAsia
08 Dec - 09 Dec	AirAsia
01 Dec - 10 Dec	AirAsia
01 Dec - 11 Dec	AirAsia
01 Dec - 16 Dec	AirAsia
12 Dec - 16 Dec	AirAsia
27 Dec - 15 Jan	AirAsia Cambodia
11 Dec - 12 Dec	AirAsia Cambodia
12 Dec - 02 Jan	AirAsia
31 Dec - 15 Jan	AirAsia
31 Dec - 20 Jan	AirAsia
31 Dec - 21 Jan	AirAsia
14 Dec - 02 Jan	AirAsia
14 Dec - 04 Jan	AirAsia
18 Dec - 02 Jan	AirAsia Cambodia
18 Dec - 04 Jan	AirAsia Cambodia
15 Dec - 02 Jan	AirAsia

Also check the deals for one-way flights from Sihanoukville to Bangkok 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 return flights from Sihanoukville to Bangkok in December from 313€

Return flights