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

Return flights

02 Dec - 09 Dec	WestJet
01 Dec - 14 Dec	WestJet
01 Dec - 08 Dec	WestJet
01 Dec - 12 Jan	WestJet
06 Dec - 13 Dec	WestJet
04 Dec - 11 Dec	WestJet
03 Dec - 10 Dec	WestJet
09 Dec - 15 Jan	Porter Airlines (Canada) Ltd
02 Dec - 13 Jan	United
07 Dec - 14 Dec	WestJet
01 Dec - 15 Dec	United
08 Dec - 05 Jan	WestJet
05 Dec - 12 Dec	WestJet
08 Dec - 15 Dec	Porter Airlines (Canada) Ltd
18 Dec - 12 Jan	Air Canada
31 Dec - 07 Jan	FrenchBee
22 Dec - 08 Jan	Air Canada
30 Dec - 06 Jan	FrenchBee
20 Dec - 15 Jan	Porter Airlines (Canada) Ltd
29 Dec - 05 Jan	TAP

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 1140€

Return flights