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

Return flights

20 Dec - 24 Dec	Hawaiian Airlines
18 Dec - 29 Dec	Hawaiian Airlines
18 Dec - 30 Dec	Hawaiian Airlines
18 Dec - 31 Dec	Hawaiian Airlines
25 Dec - 11 Jan	Hawaiian Airlines
19 Dec - 26 Dec	Hawaiian Airlines
02 Dec - 10 Dec	China Airlines
21 Dec - 06 Jan	Hawaiian Airlines
18 Dec - 01 Jan	Hawaiian Airlines
06 Dec - 14 Dec	China Airlines
02 Dec - 15 Dec	China Airlines
22 Dec - 01 Jan	Hawaiian Airlines
29 Dec - 05 Jan	Hawaiian Airlines
28 Dec - 15 Jan	Hawaiian Airlines
14 Dec - 13 Jan	China Airlines
25 Dec - 01 Jan	Hawaiian Airlines
13 Dec - 13 Jan	China Airlines
05 Dec - 12 Dec	China Airlines
14 Dec - 07 Jan	China Airlines
05 Dec - 14 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 $1871

Return flights