Cheapest return flights from Phoenix to Denver in December from $51

AirHint found the following cheapest return flights from Phoenix (PHX) to Denver (DEN) in December 2025 (see full year).

Return flights

24 Dec - 25 Dec Frontier Airlines direct
09 Dec - 12 Dec Frontier Airlines direct
10 Dec - 12 Dec Frontier Airlines direct
03 Dec - 06 Dec Frontier Airlines direct
05 Dec - 07 Dec Frontier Airlines direct
03 Dec - 05 Dec Frontier Airlines direct
12 Dec - 15 Dec Frontier Airlines direct
02 Dec - 03 Dec Frontier Airlines direct
20 Dec - 25 Dec Frontier Airlines direct
12 Dec - 14 Dec Frontier Airlines direct
13 Dec - 08 Jan Frontier Airlines
13 Dec - 08 Jan Frontier Airlines direct
31 Dec - 05 Jan Frontier Airlines direct
30 Dec - 04 Jan Frontier Airlines direct

Also check the deals for one-way flights from Phoenix to Denver in December.

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