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

Return flights

28 Dec - 11 Jan	Frontier Airlines
28 Dec - 06 Jan	Frontier Airlines
07 Dec - 19 Jan	China Airlines
19 Dec - 18 Jan	Alaska Airlines
19 Dec - 11 Jan	Hawaiian Airlines
05 Dec - 08 Dec	China Airlines
02 Dec - 09 Dec	China Airlines
11 Dec - 25 Jan	China Airlines
07 Dec - 14 Dec	China Airlines
27 Dec - 28 Jan	China Airlines
11 Dec - 14 Dec	China Airlines
12 Dec - 18 Jan	China Airlines
13 Dec - 18 Jan	China Airlines
19 Dec - 06 Jan	Alaska Airlines
12 Dec - 15 Dec	China Airlines
09 Dec - 16 Dec	China Airlines
04 Dec - 11 Dec	Qatar Airways
16 Dec - 23 Dec	China Airlines
04 Dec - 19 Dec	Qatar Airways
18 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 1336€

Return flights