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

Return flights

15 Aug - 30 Aug	Malaysia Airlines
16 Aug - 30 Aug	Malaysia Airlines
15 Aug - 31 Aug	Malaysia Airlines
01 Aug - 13 Sep	Singapore Airlines
02 Aug - 09 Aug	AirAsia X
07 Aug - 09 Aug	AirAsia X
26 Aug - 30 Aug	AirAsia X
23 Aug - 13 Sep	AirAsia X
03 Aug - 09 Aug	AirAsia X
09 Aug - 30 Aug	AirAsia X
01 Aug - 09 Aug	AirAsia X
26 Aug - 13 Sep	AirAsia X
16 Aug - 27 Aug	AirAsia X
16 Aug - 06 Sep	AirAsia X
23 Aug - 06 Sep	AirAsia X
26 Aug - 06 Sep	AirAsia X
19 Aug - 09 Sep	China Southern

Also check the deals for one-way flights from Sydney 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.

Book a cheap hotel in Phnom-penh

Cheap car rent in Phnom-penh

Cheapest return flights from Sydney to Phnom-penh in August from $522

Return flights