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

Return flights

28 Dec - 30 Jan	China Airlines
14 Dec - 25 Jan	China Airlines
28 Dec - 13 Jan	China Airlines
13 Dec - 28 Dec	China Airlines
14 Dec - 14 Jan	China Airlines
04 Dec - 14 Dec	China Airlines
27 Dec - 12 Jan	China Airlines
27 Dec - 11 Jan	China Airlines
27 Dec - 14 Jan	China Airlines
13 Dec - 11 Jan	China Airlines
13 Dec - 09 Jan	China Airlines
14 Dec - 06 Jan	China Airlines
16 Dec - 23 Dec	China Airlines
14 Dec - 31 Dec	China Airlines
20 Dec - 29 Dec	China Airlines
19 Dec - 28 Dec	China Airlines
19 Dec - 31 Dec	China Airlines

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 1854€

Return flights