AirHint found the following cheapest one-way flights from Salt Lake City (SLC) to Denver (DEN) in September 2025 (see full year).

One-Way flights

15 Sep	Frontier Airlines	direct
27 Sep	Frontier Airlines	direct
04 Sep	Frontier Airlines	direct
20 Sep	Frontier Airlines	direct
21 Sep	Frontier Airlines	direct
26 Sep	Frontier Airlines	direct
14 Sep	Frontier Airlines	direct
28 Sep	Frontier Airlines	direct
10 Sep	Frontier Airlines	direct
08 Sep	United	direct

Also check the deals for return flights from Salt Lake City to Denver 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 Salt Lake City to Denver in September from $33

One-Way flights