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

Return flights

09 Sep - 15 Sep	AirAsia
01 Sep - 08 Sep	AirAsia
10 Sep - 16 Sep	AirAsia
05 Sep - 30 Sep	AirAsia
09 Sep - 16 Sep	AirAsia
03 Sep - 16 Sep	AirAsia
03 Sep - 09 Sep	AirAsia
02 Sep - 16 Sep	AirAsia
08 Sep - 17 Sep	AirAsia
02 Sep - 09 Sep	AirAsia
05 Sep - 19 Oct	AirAsia
06 Sep - 19 Oct	AirAsia
04 Sep - 19 Oct	AirAsia
17 Sep - 01 Oct	Scoot
23 Sep - 01 Oct	Scoot
13 Sep - 13 Oct	VietJet Air
20 Sep - 25 Oct	VietJet Air
24 Sep - 14 Oct	HK Express
12 Sep - 13 Oct	Scoot
23 Sep - 02 Oct	Scoot

Also check the deals for one-way flights from Hong Kong to Sydney in September.

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 September from $353

Return flights