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

Return flights

02 Dec - 09 Dec	WestJet
01 Dec - 15 Jan	WestJet
02 Dec - 19 Jan	Air New Zealand
02 Dec - 16 Dec	Air New Zealand
08 Dec - 10 Jan	Air New Zealand
03 Dec - 12 Jan	Air New Zealand
05 Dec - 23 Dec	Air New Zealand
01 Dec - 08 Jan	Air New Zealand
02 Dec - 08 Dec	United
02 Dec - 18 Dec	United
05 Dec - 14 Dec	United
12 Dec - 19 Dec	Porter Airlines (Canada) Ltd
04 Dec - 20 Dec	United
09 Dec - 17 Jan	Qantas
04 Dec - 31 Dec	United
09 Dec - 06 Jan	Porter Airlines (Canada) Ltd
09 Dec - 30 Jan	Air New Zealand
08 Dec - 08 Jan	Air New Zealand
01 Dec - 04 Jan	Qantas
02 Dec - 30 Dec	Qantas

Also check the deals for one-way flights from Toronto 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 Toronto to Sydney in December from $1255

Return flights