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

Return flights

27 Oct - 14 Nov	Malaysia Airlines
19 Oct - 25 Oct	Malaysia Airlines
31 Oct - 10 Nov	Malaysia Airlines
15 Oct - 25 Oct	AirAsia X
15 Oct - 23 Oct	AirAsia X
15 Oct - 03 Nov	AirAsia X
19 Oct - 23 Oct	AirAsia X
15 Oct - 30 Oct	AirAsia X
19 Oct - 03 Nov	AirAsia X
04 Oct - 25 Oct	AirAsia X
04 Oct - 23 Oct	AirAsia X
19 Oct - 30 Oct	AirAsia X
04 Oct - 06 Oct	AirAsia X
04 Oct - 11 Oct	AirAsia X

Also check the deals for one-way flights from Sydney to Phnom-penh in October.

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 Sydney to Phnom-penh in October from $509

Return flights