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

Return flights

02 Sep - 10 Sep	WestJet
10 Sep - 17 Sep	WestJet
10 Sep - 21 Sep	WestJet
04 Sep - 12 Sep	WestJet
01 Sep - 03 Oct	WestJet
02 Sep - 02 Oct	WestJet
26 Sep - 17 Oct	Alaska Airlines
02 Sep - 01 Oct	WestJet
01 Sep - 30 Sep	WestJet
02 Sep - 30 Sep	WestJet
09 Sep - 18 Sep	WestJet
10 Sep - 28 Oct	WestJet
04 Sep - 03 Oct	WestJet
23 Sep - 29 Oct	WestJet
23 Sep - 07 Oct	WestJet
01 Sep - 27 Sep	WestJet
18 Sep - 29 Oct	WestJet
23 Sep - 30 Sep	WestJet
02 Sep - 29 Sep	WestJet
04 Sep - 02 Oct	WestJet

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 572€

Return flights