Cheapest return flights from Ontario to Sydney in December from $1984

Best time to book flights for Ontario (ONT) to Sydney (SYD) flights at AirHint

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

Return flights

04 Dec - 16 Jan Alaska Airlines
09 Dec - 19 Jan China Airlines
14 Dec - 12 Jan China Airlines
14 Dec - 05 Jan China Airlines
25 Dec - 06 Jan China Airlines
25 Dec - 09 Jan China Airlines
18 Dec - 06 Jan China Airlines
18 Dec - 28 Jan China Airlines
20 Dec - 05 Jan China Airlines
19 Dec - 19 Jan China Airlines
06 Dec - 20 Dec Qatar Airways

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

Skyscanner

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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