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

Return flights

01 Dec - 08 Dec	Air Canada
03 Dec - 10 Dec	Air Canada
02 Dec - 09 Dec	Air Canada
06 Dec - 13 Dec	Air Canada
27 Dec - 17 Jan	Air Canada
09 Dec - 25 Dec	Air Canada
25 Dec - 13 Jan	Air Canada
09 Dec - 16 Dec	Air Canada
04 Dec - 11 Dec	Air Canada
05 Dec - 12 Dec	Air Canada
08 Dec - 15 Dec	Air Canada
22 Dec - 29 Dec	Air Canada
25 Dec - 01 Jan	Air Canada
29 Dec - 05 Jan	Air Canada
30 Dec - 06 Jan	Air Canada
14 Dec - 21 Jan	Air Canada
31 Dec - 07 Jan	Air Canada
26 Dec - 02 Jan	Air Canada
28 Dec - 04 Jan	Porter Airlines (Canada) Ltd
27 Dec - 03 Jan	Air Canada

Also check the deals for one-way flights from Montreal 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 Montreal to Sydney in December from 1100€

Return flights