AirHint found the following cheapest return flights from Phoenix (PHX) to Denver (DEN) in March 2026 (see full year).
Return flights
| 05 Mar - 08 Mar | Frontier Airlines | direct | |
| 09 Mar - 15 Mar | Frontier Airlines | direct | |
| 12 Mar - 15 Mar | Frontier Airlines | direct | |
| 26 Mar - 28 Mar | United | direct | |
| 27 Mar - 28 Mar | United | direct |
Also check the deals for one-way flights from Phoenix to Denver in March.
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