Cheapest return flights from Ontario to Sydney in September from $1090

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

Return flights

04 Sep - 21 Sep Alaska Airlines
19 Sep - 29 Sep Lufthansa
23 Sep - 02 Oct China Airlines
08 Sep - 15 Sep China Airlines
26 Sep - 24 Oct China Airlines
19 Sep - 21 Sep China Airlines
04 Sep - 18 Sep Etihad Airways
05 Sep - 10 Oct China Airlines
14 Sep - 12 Oct Japan Airlines

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

Skyscanner

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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