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

Return flights

28 Aug - 03 Sep	WestJet	direct
23 Aug - 30 Aug	WestJet	direct
29 Aug - 02 Sep	WestJet	direct
28 Aug - 02 Sep	WestJet	direct
24 Aug - 27 Aug	WestJet	direct
23 Aug - 26 Aug	WestJet	direct
21 Aug - 28 Aug	Frontier Airlines
28 Aug - 01 Sep	WestJet	direct
29 Aug - 01 Sep	WestJet	direct
18 Aug - 24 Aug	Frontier Airlines
21 Aug - 28 Aug	WestJet	direct
19 Aug - 19 Aug	WestJet

Also check the deals for one-way flights from Denver to Calgary in August.

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 August from $247

Return flights