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

Return flights

23 Oct - 30 Oct	Hawaiian Airlines
16 Oct - 08 Nov	Hawaiian Airlines
16 Oct - 09 Nov	Hawaiian Airlines
31 Oct - 11 Nov	Hawaiian Airlines
15 Oct - 09 Nov	Hawaiian Airlines
21 Oct - 12 Nov	China Airlines
26 Oct - 03 Nov	China Airlines
28 Oct - 09 Nov	China Airlines
18 Oct - 31 Oct	China Airlines
04 Oct - 29 Oct	jetBlue
10 Oct - 16 Oct	China Airlines
11 Oct - 17 Oct	China Airlines
01 Oct - 08 Oct	China Airlines
23 Oct - 20 Nov	Qatar Airways
27 Oct - 08 Nov	Qatar Airways
02 Oct - 06 Oct	Qatar Airways
07 Oct - 13 Oct	China Airlines

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 $1070

Return flights