AirHint found the following cheapest return flights from Colombo (CMB) to Phnom-penh (PNH) in August 2025 (see full year).

Return flights

27 Aug - 05 Sep	Thai AirAsia
27 Aug - 06 Sep	Thai AirAsia
27 Aug - 31 Aug	Thai AirAsia
27 Aug - 08 Sep	Thai AirAsia
27 Aug - 29 Aug	Thai AirAsia
27 Aug - 30 Aug	Thai AirAsia
30 Aug - 31 Aug	AirAsia
29 Aug - 05 Sep	AirAsia
29 Aug - 06 Sep	AirAsia
25 Aug - 05 Sep	Thai AirAsia
25 Aug - 06 Sep	Thai AirAsia
29 Aug - 31 Aug	AirAsia
30 Aug - 05 Sep	Thai AirAsia
30 Aug - 06 Sep	Thai AirAsia
29 Aug - 08 Sep	AirAsia
25 Aug - 31 Aug	Thai AirAsia
25 Aug - 29 Aug	Thai AirAsia
29 Aug - 30 Aug	AirAsia
22 Aug - 29 Aug	AirAsia
20 Aug - 24 Aug	AirAsia

Also check the deals for one-way flights from Colombo to Phnom-penh in August.

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 Colombo to Phnom-penh in August from $353

Return flights