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

Return flights

28 Oct - 25 Nov	Hawaiian Airlines
24 Oct - 04 Nov	Hawaiian Airlines
21 Oct - 28 Oct	Hawaiian Airlines
13 Oct - 20 Oct	China Airlines
24 Oct - 31 Oct	China Airlines
14 Oct - 28 Oct	China Airlines
02 Oct - 11 Oct	Qatar Airways

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

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 October from $1229

Return flights