Cheapest one-way flights from Ontario to Sydney in September from $578

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

One-Way flights

21 Sep China Airlines
26 Sep Alaska Airlines
24 Sep Alaska Airlines
19 Sep Alaska Airlines
23 Sep Alaska Airlines
28 Sep Alaska Airlines
30 Sep Alaska Airlines
25 Sep Alaska Airlines
22 Sep Frontier Airlines
27 Sep China Airlines

Also check the deals for return 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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