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

Return flights

01 Dec - 29 Dec	United
02 Dec - 16 Dec	United
01 Dec - 15 Dec	United
03 Dec - 07 Jan	United
05 Dec - 28 Dec	United
05 Dec - 23 Dec	United
01 Dec - 05 Dec	United
05 Dec - 12 Jan	United
06 Dec - 22 Jan	WestJet
08 Dec - 14 Dec	United
08 Dec - 25 Dec	United
09 Dec - 20 Dec	United
11 Dec - 06 Jan	United
06 Dec - 09 Jan	United
30 Dec - 11 Jan	Cathay Pacific
27 Dec - 11 Jan	Qantas
25 Dec - 10 Jan	Air Canada
22 Dec - 05 Jan	Air Canada
26 Dec - 09 Jan	Air Canada
15 Dec - 31 Dec	Philippine Airlines

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 1334€

Return flights