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

Return flights

17 Oct - 24 Oct	Porter Airlines (Canada) Ltd
15 Oct - 22 Oct	Porter Airlines (Canada) Ltd
20 Oct - 27 Oct	Air Canada
22 Oct - 29 Oct	Air Canada
27 Oct - 03 Nov	Air Canada
29 Oct - 05 Nov	Air Canada
25 Oct - 01 Nov	Air Canada
19 Oct - 26 Oct	Air Canada
21 Oct - 28 Oct	Air Canada
26 Oct - 02 Nov	Air Canada
28 Oct - 04 Nov	Air Canada
18 Oct - 25 Oct	Air Canada
23 Oct - 30 Oct	Air Canada
24 Oct - 31 Oct	Air Canada
31 Oct - 07 Nov	Air Canada
30 Oct - 06 Nov	Air Canada
12 Oct - 19 Oct	WestJet
15 Oct - 04 Nov	Air Canada

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

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 October from 856€

Return flights