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

Return flights

29 Aug - 09 Sep	Thai AirAsia
25 Aug - 09 Sep	Thai AirAsia
27 Aug - 09 Sep	Thai AirAsia
26 Aug - 09 Sep	Thai AirAsia
31 Aug - 09 Sep	Thai AirAsia
25 Aug - 27 Aug	Thai AirAsia
31 Aug - 20 Sep	Thai AirAsia
26 Aug - 27 Aug	Thai AirAsia
06 Aug - 13 Aug	AirAsia Cambodia
08 Aug - 22 Aug	AirAsia Cambodia
08 Aug - 27 Aug	AirAsia Cambodia
22 Aug - 09 Sep	Thai AirAsia
21 Aug - 09 Sep	AirAsia Cambodia
04 Aug - 22 Aug	AirAsia Cambodia
07 Aug - 22 Aug	AirAsia Cambodia
07 Aug - 27 Aug	AirAsia Cambodia
13 Aug - 22 Aug	Thai AirAsia
13 Aug - 27 Aug	Thai AirAsia

Also check the deals for one-way flights from Phnom-penh to Colombo 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 Phnom-penh to Colombo in August from 320€

Return flights