Cheapest return MSP–DEN flights, September

AirHint found the following cheapest return flights from Minneapolis (MSP) to Denver (DEN) in September 2026 (see full year).

Return flights

23 Sep - 30 Sep Frontier Airlines direct
05 Sep - 08 Sep Frontier Airlines direct
17 Sep - 22 Sep Frontier Airlines direct
17 Sep - 23 Sep Frontier Airlines direct
17 Sep - 19 Sep Frontier Airlines direct
03 Sep - 06 Sep Frontier Airlines direct
24 Sep - 27 Sep Frontier Airlines direct
10 Sep - 13 Sep Frontier Airlines direct
04 Sep - 07 Sep Delta direct

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

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