Cheapest return flights from Kansas City to Denver in September from $114

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

Return flights

19 Sep - 22 Sep Frontier Airlines direct
12 Sep - 15 Sep Frontier Airlines direct
05 Sep - 07 Sep Frontier Airlines direct
04 Sep - 07 Sep Frontier Airlines direct
07 Sep - 14 Sep Frontier Airlines direct
25 Sep - 26 Sep Frontier Airlines direct
25 Sep - 28 Sep Frontier Airlines direct
12 Sep - 14 Sep Frontier Airlines direct
20 Sep - 23 Sep Southwest Airlines direct
13 Sep - 18 Sep Southwest Airlines direct

Also check the deals for one-way flights from Kansas City 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.

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