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

Return flights

05 Dec - 10 Dec	China Airlines
27 Dec - 18 Jan	China Airlines
14 Dec - 18 Jan	China Airlines
11 Dec - 18 Jan	China Airlines
20 Dec - 07 Jan	China Airlines
16 Dec - 11 Jan	China Airlines
25 Dec - 07 Jan	China Airlines
23 Dec - 13 Jan	China Airlines
23 Dec - 11 Jan	China Airlines
26 Dec - 04 Jan	China Airlines
21 Dec - 30 Dec	China Airlines
25 Dec - 04 Jan	China Airlines
01 Dec - 10 Dec	Qatar Airways
15 Dec - 25 Dec	Qatar Airways

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

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 December from 1652€

Return flights