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

Return flights

08 Aug - 30 Aug	Hawaiian Airlines
28 Aug - 02 Sep	Hawaiian Airlines
26 Aug - 02 Sep	Hawaiian Airlines
30 Aug - 07 Sep	China Airlines
20 Aug - 11 Sep	China Airlines
29 Aug - 03 Sep	China Airlines
23 Aug - 01 Sep	China Airlines
19 Aug - 01 Sep	China Airlines
18 Aug - 01 Sep	China Airlines
13 Aug - 30 Sep	Qatar Airways
16 Aug - 01 Sep	jetBlue
19 Aug - 21 Aug	China Airlines
12 Aug - 25 Aug	Qatar Airways
14 Aug - 26 Aug	Qatar Airways
12 Aug - 29 Aug	Qatar Airways
04 Aug - 11 Aug	China Airlines
18 Aug - 20 Aug	Qatar Airways
06 Aug - 10 Aug	Qatar Airways
14 Aug - 24 Aug	Qatar Airways
19 Aug - 31 Aug	Qatar 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 1078€

Return flights