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

Return flights

20 Oct - 03 Nov	China Southern
30 Oct - 03 Nov	China Southern
09 Oct - 21 Oct	AirAsia X
07 Oct - 21 Oct	AirAsia X
01 Oct - 21 Oct	AirAsia X
25 Oct - 03 Nov	AirAsia X
01 Oct - 06 Oct	AirAsia X
10 Oct - 21 Oct	AirAsia X
12 Oct - 21 Oct	AirAsia X
25 Oct - 01 Nov	AirAsia X
01 Oct - 03 Oct	AirAsia X
09 Oct - 14 Oct	AirAsia X
07 Oct - 14 Oct	AirAsia X
01 Oct - 14 Oct	AirAsia X
10 Oct - 12 Nov	Singapore Airlines
25 Oct - 15 Nov	AirAsia X
12 Oct - 01 Nov	AirAsia X
25 Oct - 09 Nov	AirAsia X
25 Oct - 11 Nov	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 $514

Return flights