Cheapest return flights from Denver to Phoenix in December from $54

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

Return flights

31 Dec - 07 Jan Frontier Airlines direct
10 Dec - 17 Dec Frontier Airlines direct
17 Dec - 07 Jan Frontier Airlines direct
17 Dec - 08 Jan Frontier Airlines direct
05 Dec - 07 Dec Frontier Airlines direct
06 Dec - 07 Dec Frontier Airlines direct
04 Dec - 06 Dec Frontier Airlines
12 Dec - 14 Dec Frontier Airlines direct
25 Dec - 30 Dec Frontier Airlines direct
30 Dec - 31 Dec Frontier Airlines direct
30 Dec - 06 Jan Frontier Airlines direct
14 Dec - 21 Dec Frontier Airlines
19 Dec - 20 Dec Frontier Airlines direct
04 Dec - 06 Dec Frontier Airlines direct
30 Dec - 02 Jan Frontier Airlines direct
14 Dec - 06 Jan Delta
14 Dec - 07 Jan Delta

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

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