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

Return flights

29 Aug - 05 Sep	Porter Airlines (Canada) Ltd
31 Aug - 07 Sep	Porter Airlines (Canada) Ltd
30 Aug - 15 Sep	Porter Airlines (Canada) Ltd
30 Aug - 13 Sep	Porter Airlines (Canada) Ltd
24 Aug - 04 Sep	Qatar Airways
19 Aug - 26 Aug	United
27 Aug - 03 Sep	United
20 Aug - 27 Aug	United
29 Aug - 29 Sep	Porter Airlines (Canada) Ltd
25 Aug - 01 Sep	ANA
18 Aug - 11 Sep	United
30 Aug - 06 Sep	Porter Airlines (Canada) Ltd
26 Aug - 31 Aug	Qatar Airways
22 Aug - 29 Aug	Qatar Airways
21 Aug - 28 Aug	United
23 Aug - 30 Aug	United
18 Aug - 25 Aug	United
16 Aug - 24 Aug	Emirates

Also check the deals for one-way flights from Montreal to Sydney in August.

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 August from 1156€

Return flights