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

Return flights

24 Oct - 04 Nov	China Airlines
31 Oct - 11 Nov	China Airlines
14 Oct - 03 Nov	China Airlines
15 Oct - 09 Nov	China Airlines
14 Oct - 26 Oct	China Airlines
26 Oct - 02 Nov	China Airlines
15 Oct - 29 Oct	China Airlines
22 Oct - 03 Nov	China Airlines
14 Oct - 23 Oct	China Airlines
18 Oct - 09 Nov	China Airlines
15 Oct - 31 Oct	China Airlines
14 Oct - 17 Oct	China Airlines
07 Oct - 26 Oct	China Airlines
06 Oct - 23 Oct	China Airlines
07 Oct - 16 Oct	China Airlines
11 Oct - 20 Oct	jetBlue
31 Oct - 28 Nov	China Airlines
03 Oct - 06 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 1821€

Return flights