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

Return flights

03 Sep - 10 Sep	WestJet
17 Sep - 21 Sep	WestJet
10 Sep - 17 Sep	WestJet
02 Sep - 09 Sep	WestJet
03 Sep - 25 Sep	WestJet
27 Sep - 18 Oct	Qantas
08 Sep - 15 Sep	Qantas
27 Sep - 17 Oct	Air Canada
23 Sep - 29 Oct	Alaska Airlines
02 Sep - 08 Sep	United
18 Sep - 29 Oct	Delta
11 Sep - 02 Oct	United
26 Sep - 17 Oct	United

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 562€

Return flights