AirHint found the following cheapest return flights from Montreal (YUL) to Sydney (SYD) in September 2026 (see full year).

Return flights

02 Sep - 09 Sep	Air Canada
07 Sep - 14 Sep	Air Canada
14 Sep - 21 Sep	Air Canada
16 Sep - 23 Sep	Air Canada
21 Sep - 28 Sep	Air Canada
23 Sep - 30 Sep	Air Canada
28 Sep - 05 Oct	Air Canada
30 Sep - 07 Oct	Air Canada
05 Sep - 12 Sep	Air Canada
09 Sep - 16 Sep	Air Canada
12 Sep - 19 Sep	Air Canada
19 Sep - 26 Sep	Air Canada
26 Sep - 03 Oct	Air Canada
29 Sep - 06 Oct	WestJet
27 Sep - 04 Oct	Air Canada
24 Sep - 01 Oct	Flair Airlines
25 Sep - 02 Oct	Air Canada

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

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 September from 1249€

Return flights