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

Return flights

02 Sep - 10 Sep	WestJet
24 Sep - 22 Oct	WestJet
06 Sep - 12 Sep	WestJet
02 Sep - 07 Sep	WestJet
02 Sep - 12 Sep	WestJet
10 Sep - 17 Sep	WestJet
02 Sep - 21 Sep	WestJet
04 Sep - 14 Sep	WestJet
24 Sep - 24 Oct	WestJet
01 Sep - 10 Sep	WestJet
03 Sep - 10 Sep	WestJet
22 Sep - 12 Oct	WestJet
02 Sep - 09 Sep	WestJet
24 Sep - 06 Oct	WestJet
22 Sep - 06 Oct	WestJet
20 Sep - 12 Oct	Porter Airlines (Canada) Ltd
10 Sep - 01 Oct	WestJet
27 Sep - 04 Oct	Porter Airlines (Canada) Ltd
26 Sep - 04 Oct	WestJet
26 Sep - 16 Oct	WestJet

Also check the deals for one-way flights from Toronto 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 Toronto to Sydney in September from 578€

Return flights