AirHint found the following cheapest return flights from Hong Kong (HKG) to Sydney (SYD) in December 2025 (see full year).

Return flights

15 Dec - 15 Jan	Scoot
15 Dec - 14 Jan	AirAsia
13 Dec - 12 Jan	Scoot
29 Dec - 15 Jan	AirAsia
29 Dec - 14 Jan	AirAsia
31 Dec - 15 Jan	AirAsia
27 Dec - 15 Jan	AirAsia
27 Dec - 14 Jan	AirAsia
23 Dec - 13 Jan	AirAsia
17 Dec - 04 Jan	Scoot
01 Dec - 06 Dec	AirAsia
17 Dec - 29 Dec	AirAsia
02 Dec - 10 Dec	Hong Kong Airlines	direct
04 Dec - 10 Dec	AirAsia
02 Dec - 14 Dec	Hong Kong Airlines	direct
01 Dec - 03 Dec	AirAsia
04 Dec - 10 Dec	Hong Kong Airlines	direct
01 Dec - 15 Dec	Scoot
25 Dec - 30 Dec	Scoot
26 Dec - 30 Dec	Scoot

Also check the deals for one-way flights from Hong Kong to Sydney 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 Hong Kong to Sydney in December from $469

Return flights