Cheapest one-way flights from Phoenix to Denver in December from $24

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

One-Way flights

25 Dec Frontier Airlines direct
12 Dec Frontier Airlines direct
03 Dec Frontier Airlines direct
07 Dec Frontier Airlines direct
16 Dec Frontier Airlines direct
09 Dec Frontier Airlines direct
06 Dec Frontier Airlines direct
05 Dec Frontier Airlines direct
15 Dec Frontier Airlines direct
20 Dec Frontier Airlines direct

Also check the deals for return flights from Phoenix to Denver in December.

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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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