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

One-Way flights

26 Sep	WestJet	direct
19 Sep	WestJet	direct
05 Sep	WestJet	direct
13 Sep	Air Canada
14 Sep	WestJet	direct
24 Sep	Alaska Airlines
09 Sep	Air Canada
13 Sep	Lufthansa	direct
24 Sep	Lufthansa	direct
09 Sep	Lufthansa	direct

Also check the deals for return 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 one-way flights from Denver to Calgary in September from $43

One-Way flights