Cheapest return flights from Ontario to Sydney in September from $1361

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

29 Sep - 05 Oct Alaska Airlines
24 Sep - 08 Oct Alaska Airlines
15 Sep - 28 Sep Alaska Airlines
02 Sep - 14 Sep China Airlines
09 Sep - 21 Sep China Airlines
15 Sep - 03 Oct China Airlines
22 Sep - 28 Sep China Airlines
06 Sep - 14 Sep China Airlines
29 Sep - 26 Oct China Airlines
02 Sep - 16 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.

Book a cheap hotel in Sydney

Cheap car rent in Sydney