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 - 08 Dec	WestJet
06 Dec - 13 Dec	WestJet
04 Dec - 11 Dec	WestJet
03 Dec - 10 Dec	WestJet
07 Dec - 14 Dec	WestJet
01 Dec - 15 Dec	United
05 Dec - 12 Dec	Air New Zealand
06 Dec - 27 Dec	WestJet
08 Dec - 15 Dec	Porter Airlines (Canada) Ltd
25 Dec - 16 Jan	Air Transat
23 Dec - 16 Jan	FrenchBee
04 Dec - 04 Jan	WestJet
22 Dec - 16 Jan	Air Canada
30 Dec - 13 Jan	Qantas
31 Dec - 07 Jan	FrenchBee
10 Dec - 16 Jan	Qantas
22 Dec - 10 Jan	Air Canada
30 Dec - 06 Jan	FrenchBee
24 Dec - 09 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 $1351

Return flights