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

Return flights

16 Sep - 23 Sep	WestJet	direct
19 Sep - 26 Sep	WestJet	direct
22 Sep - 29 Sep	WestJet	direct
04 Sep - 11 Sep	WestJet	direct
05 Sep - 12 Sep	WestJet	direct
09 Sep - 16 Sep	WestJet	direct
15 Sep - 22 Sep	WestJet	direct
05 Sep - 08 Sep	WestJet	direct
22 Sep - 25 Sep	WestJet	direct
04 Sep - 06 Sep	WestJet	direct
26 Sep - 03 Oct	WestJet	direct
22 Sep - 24 Oct	WestJet
24 Sep - 01 Oct	United	direct
30 Sep - 07 Oct	United	direct
22 Sep - 24 Oct	United	direct

Also check the deals for one-way flights from Denver to Calgary 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 Denver to Calgary in September from 113€

Return flights