Cheapest return flights from Ontario to Sydney in September from $1117

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

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

Return flights

26 Sep - 24 Oct Hawaiian Airlines
12 Sep - 21 Sep Alaska Airlines
01 Sep - 08 Sep Alaska Airlines
12 Sep - 19 Sep Alaska Airlines
01 Sep - 15 Sep Alaska Airlines
23 Sep - 28 Sep China Airlines
10 Sep - 18 Sep China Airlines
01 Sep - 29 Sep China Airlines
22 Sep - 25 Sep China Airlines
09 Sep - 25 Sep China Airlines
05 Sep - 03 Oct China Airlines
11 Sep - 21 Sep Qatar Airways

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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