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

Return flights

11 Sep - 20 Sep	Frontier Airlines	direct
05 Sep - 06 Sep	Frontier Airlines	direct
03 Sep - 07 Sep	Frontier Airlines	direct
05 Sep - 07 Sep	Frontier Airlines
06 Sep - 07 Sep	Frontier Airlines
19 Sep - 22 Sep	Frontier Airlines	direct
05 Sep - 07 Sep	Frontier Airlines	direct
12 Sep - 15 Sep	Frontier Airlines	direct
19 Sep - 21 Sep	Frontier Airlines
23 Sep - 25 Sep	Southwest Airlines	direct

Also check the deals for one-way flights from El Paso 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 return flights from El Paso to Denver in September from $58

Return flights