AirHint found the following cheapest return flights from Calgary (YYC) to Sydney (SYD) in September 2025 (see full year).

Return flights

10 Sep - 24 Oct	WestJet
17 Sep - 19 Sep	WestJet
21 Sep - 05 Oct	WestJet
10 Sep - 01 Oct	WestJet
23 Sep - 29 Oct	WestJet
10 Sep - 31 Oct	WestJet
18 Sep - 29 Oct	WestJet
10 Sep - 28 Oct	WestJet
08 Sep - 24 Sep	WestJet
08 Sep - 15 Sep	Cathay Pacific
18 Sep - 06 Oct	United
10 Sep - 21 Oct	Delta

Also check the deals for one-way flights from Calgary 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 Calgary to Sydney in September from $814

Return flights