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

Return flights

18 Sep - 19 Sep	VietJet Air
24 Sep - 03 Oct	VietJet Air
17 Sep - 21 Sep	VietJet Air	direct
18 Sep - 25 Sep	VietJet Air
20 Sep - 27 Sep	Vietravel Airlines
24 Sep - 04 Oct	VietJet Air
24 Sep - 07 Oct	VietJet Air
22 Sep - 28 Sep	VietJet Air
23 Sep - 29 Sep	VietJet Air
20 Sep - 29 Sep	VietJet Air
19 Sep - 26 Sep	VietJet Air
27 Sep - 27 Oct	VietJet Air
22 Sep - 01 Oct	VietJet Air
24 Sep - 28 Sep	VietJet Air
22 Sep - 04 Oct	AirAsia
23 Sep - 04 Oct	AirAsia
18 Sep - 04 Oct	AirAsia
30 Sep - 11 Oct	VietJet Air
17 Sep - 04 Oct	AirAsia
21 Sep - 30 Sep	VietJet Air

Also check the deals for one-way flights from Hanoi 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 Hanoi to Sydney in September from 299€

Return flights