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

Return flights

05 Sep - 09 Sep	AirAsia
23 Sep - 14 Oct	AirAsia
03 Sep - 15 Sep	AirAsia
08 Sep - 15 Sep	AirAsia
02 Sep - 16 Sep	AirAsia
02 Sep - 06 Sep	AirAsia
05 Sep - 11 Sep	AirAsia
03 Sep - 10 Sep	AirAsia
05 Sep - 15 Sep	AirAsia
03 Sep - 11 Sep	AirAsia
02 Sep - 05 Sep	AirAsia
19 Sep - 14 Oct	Scoot Tigerair
22 Sep - 12 Oct	Scoot Tigerair
10 Sep - 02 Oct	AirAsia
18 Sep - 12 Oct	Greater Bay Airlines
24 Sep - 18 Oct	Scoot Tigerair
19 Sep - 02 Oct	Scoot Tigerair
23 Sep - 03 Oct	AirAsia
25 Sep - 19 Oct	HK Express
24 Sep - 07 Oct	Scoot Tigerair

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.

Book a cheap hotel in Sydney

Cheap car rent in Sydney

Cheapest return flights from Hong Kong to Sydney in September from 291€

Return flights