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

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

Return flights

04 Dec - 07 Dec Frontier Airlines direct
05 Dec - 07 Dec Frontier Airlines direct
25 Dec - 28 Dec Frontier Airlines direct
09 Dec - 16 Dec Alaska Airlines direct
09 Dec - 17 Dec Alaska Airlines direct
08 Dec - 15 Dec United direct
12 Dec - 15 Dec Frontier Airlines
16 Dec - 04 Jan Alaska Airlines direct
20 Dec - 23 Dec Frontier Airlines direct
19 Dec - 23 Dec Alaska Airlines direct
24 Dec - 28 Dec Frontier Airlines

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

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