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

Return flights

18 Aug - 25 Aug	AirAsia
21 Aug - 31 Aug	AirAsia
09 Aug - 16 Aug	AirAsia
17 Aug - 02 Sep	AirAsia
08 Aug - 18 Aug	Singapore Airlines
07 Aug - 17 Aug	Singapore Airlines
11 Aug - 22 Aug	Singapore Airlines
01 Aug - 02 Sep	Singapore Airlines
22 Aug - 30 Aug	Singapore Airlines
05 Aug - 11 Aug	Singapore Airlines
20 Aug - 02 Sep	AirAsia
20 Aug - 31 Aug	AirAsia
20 Aug - 27 Aug	AirAsia
18 Aug - 02 Sep	AirAsia
21 Aug - 02 Sep	AirAsia
25 Aug - 02 Sep	AirAsia
23 Aug - 02 Sep	AirAsia
25 Aug - 15 Sep	AirAsia

Also check the deals for one-way flights from Perth 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 Perth to Phnom-penh in August from $318

Return flights