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

Return flights

26 Sep - 08 Oct	AirAsia
25 Sep - 08 Oct	AirAsia Cambodia
26 Sep - 06 Oct	AirAsia
23 Sep - 08 Oct	AirAsia Cambodia
25 Sep - 06 Oct	AirAsia Cambodia
26 Sep - 12 Oct	AirAsia
23 Sep - 06 Oct	AirAsia Cambodia
25 Sep - 12 Oct	AirAsia Cambodia
23 Sep - 12 Oct	AirAsia Cambodia
24 Sep - 08 Oct	AirAsia
26 Sep - 29 Sep	AirAsia
25 Sep - 29 Sep	AirAsia Cambodia
23 Sep - 29 Sep	AirAsia Cambodia
24 Sep - 29 Sep	AirAsia
26 Sep - 28 Sep	AirAsia
25 Sep - 28 Sep	AirAsia Cambodia
23 Sep - 28 Sep	AirAsia Cambodia
24 Sep - 28 Sep	AirAsia
22 Sep - 28 Sep	AirAsia
22 Sep - 24 Sep	AirAsia

Also check the deals for one-way flights from Sihanoukville 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 return flights from Sihanoukville to Bangkok in September from 324€

Return flights