Cheapest return flights from Ontario to Sydney in September from $1051

AirHint found the following cheapest return flights from Ontario (ONT) to Sydney (SYD) in September 2026 (see full year).

Return flights

25 Sep - 03 Oct Alaska Airlines
23 Sep - 07 Oct Alaska Airlines
18 Sep - 30 Sep Alaska Airlines
19 Sep - 30 Sep Alaska Airlines
03 Sep - 24 Sep Alaska Airlines
15 Sep - 29 Sep Alaska Airlines
22 Sep - 15 Oct Alaska Airlines
28 Sep - 16 Oct China Airlines
02 Sep - 30 Sep China Airlines
27 Sep - 08 Oct Qatar Airways
13 Sep - 15 Sep Qatar Airways

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

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