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

Return flights

26 Sep - 12 Oct	China Southern
20 Sep - 26 Sep	Cathay Pacific
25 Sep - 07 Oct	China Southern
26 Sep - 08 Oct	Thai Lion Air
22 Sep - 02 Oct	AirAsia X
22 Sep - 30 Sep	AirAsia X
19 Sep - 02 Oct	AirAsia X
24 Sep - 02 Oct	AirAsia X
19 Sep - 30 Sep	AirAsia X
24 Sep - 30 Sep	AirAsia X
22 Sep - 05 Oct	AirAsia X
22 Sep - 04 Oct	AirAsia X
22 Sep - 12 Oct	AirAsia X
22 Sep - 11 Oct	AirAsia X
22 Sep - 28 Sep	AirAsia X
21 Sep - 27 Sep	China Southern
22 Sep - 27 Sep	AirAsia X
22 Sep - 25 Sep	AirAsia X
19 Sep - 28 Sep	AirAsia X
24 Sep - 28 Sep	AirAsia X

Also check the deals for one-way flights from Hangzhou 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 Hangzhou to Sydney in September from 664€

Return flights