Cheapest return flights from Calgary to Denver in September from 100€

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

Return flights

11 Sep - 14 Sep WestJet direct
12 Sep - 14 Sep WestJet direct
25 Sep - 28 Sep WestJet direct
24 Sep - 01 Oct Air Canada
19 Sep - 21 Sep WestJet direct
18 Sep - 21 Sep WestJet direct
26 Sep - 28 Sep WestJet
21 Sep - 24 Sep Delta
18 Sep - 24 Sep Delta
27 Sep - 30 Sep Delta
04 Sep - 21 Sep WestJet direct
24 Sep - 01 Oct United direct

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

Skyscanner

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.

Book a cheap hotel in Denver

Cheap car rent in Denver

Feel free to contact us with any feedback or request another flight research.