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

Return flights

16 Aug - 26 Aug	AirAsia X
16 Aug - 18 Aug	AirAsia X
19 Aug - 26 Aug	AirAsia X
22 Aug - 26 Aug	AirAsia X
15 Aug - 26 Aug	AirAsia X
15 Aug - 18 Aug	AirAsia X
19 Aug - 04 Sep	Malaysia Airlines
16 Aug - 25 Aug	AirAsia X
22 Aug - 25 Aug	AirAsia X
15 Aug - 25 Aug	AirAsia X
09 Aug - 13 Aug	Malaysia Airlines
26 Aug - 12 Sep	AirAsia X
26 Aug - 15 Sep	AirAsia X
28 Aug - 18 Sep	AirAsia X
28 Aug - 12 Sep	AirAsia X
28 Aug - 15 Sep	AirAsia X
19 Aug - 17 Sep	AirAsia X
26 Aug - 16 Sep	AirAsia X
28 Aug - 17 Sep	AirAsia X
28 Aug - 16 Sep	AirAsia X

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 $495

Return flights