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

Return flights

21 Aug - 27 Aug	Alaska Airlines
22 Aug - 05 Sep	Lufthansa
06 Aug - 10 Aug	Lufthansa
05 Aug - 19 Aug	Lufthansa
30 Aug - 14 Sep	Alaska Airlines
04 Aug - 14 Aug	Hawaiian Airlines
25 Aug - 03 Sep	Alaska Airlines
19 Aug - 02 Sep	Lufthansa
25 Aug - 15 Sep	China Airlines
25 Aug - 28 Aug	China Airlines
13 Aug - 31 Aug	China Airlines
19 Aug - 29 Aug	China Airlines
05 Aug - 20 Aug	China Airlines
04 Aug - 13 Aug	China Airlines
26 Aug - 02 Sep	Japan Airlines
02 Aug - 11 Aug	China Airlines
28 Aug - 02 Sep	Japan Airlines
25 Aug - 01 Sep	China Airlines
26 Aug - 01 Sep	China Airlines
30 Aug - 13 Sep	Etihad Airways

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

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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Cheapest return flights from Ontario to Sydney in August from $1019

Return flights