Cheapest one-way flights from Phoenix to Denver in September from $27

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

One-Way flights

30 Sep Frontier Airlines direct
24 Sep Frontier Airlines direct
27 Sep Frontier Airlines direct
29 Sep Frontier Airlines
25 Sep Frontier Airlines
29 Sep Frontier Airlines direct
25 Sep Frontier Airlines direct
20 Sep Frontier Airlines direct
28 Sep Frontier Airlines
26 Sep Frontier Airlines

Also check the deals for return flights from Phoenix 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.

Book a cheap hotel in Denver

Cheap car rent in Denver

Feel free to contact us with any feedback or request another flight research.