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

One-Way flights

13 Sep	Frontier Airlines	direct
17 Sep	Frontier Airlines	direct
20 Sep	Frontier Airlines	direct
24 Sep	Frontier Airlines	direct
06 Sep	Frontier Airlines	direct
10 Sep	Frontier Airlines	direct
12 Sep	Frontier Airlines	direct
04 Sep	Frontier Airlines	direct
26 Sep	Frontier Airlines	direct
28 Sep	Frontier Airlines	direct

Also check the deals for return flights from Denver to Miami 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 Miami in September from $35

One-Way flights