Cheapest one-way flights from Ontario to Sydney in September from $366

Best time to book flights for Ontario (ONT) to Sydney (SYD) flights at AirHint

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

One-Way flights

04 Sep Alaska Airlines
19 Sep Alaska Airlines
13 Sep Alaska Airlines
17 Sep Alaska Airlines
27 Sep Alaska Airlines
15 Sep China Airlines
28 Sep Philippine Airlines
26 Sep China Airlines
07 Sep Japan 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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