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

Return flights

05 Dec - 14 Dec	Vietnam Airlines
10 Dec - 17 Dec	Vietnam Airlines
13 Dec - 14 Dec	AirAsia X
13 Dec - 24 Dec	AirAsia X
13 Dec - 19 Dec	AirAsia X
13 Dec - 23 Dec	AirAsia X
26 Dec - 04 Jan	Singapore Airlines
25 Dec - 03 Jan	Singapore Airlines
20 Dec - 24 Dec	AirAsia X
13 Dec - 03 Jan	AirAsia X
23 Dec - 06 Jan	Singapore Airlines
23 Dec - 24 Dec	AirAsia X
20 Dec - 23 Dec	AirAsia X
13 Dec - 18 Dec	AirAsia X
25 Dec - 04 Jan	AirAsia X
20 Dec - 04 Jan	AirAsia X
23 Dec - 04 Jan	AirAsia X
20 Dec - 03 Jan	AirAsia X
23 Dec - 03 Jan	AirAsia X
25 Dec - 11 Jan	AirAsia X

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

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 December from $642

Return flights