Cheapest return flights from Portland to Denver in December from $268

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

Return flights

18 Dec - 21 Dec Frontier Airlines
19 Dec - 22 Dec Frontier Airlines
29 Dec - 02 Jan Frontier Airlines
25 Dec - 01 Jan Frontier Airlines direct
30 Dec - 03 Jan Frontier Airlines
31 Dec - 03 Jan Frontier Airlines
27 Dec - 01 Jan Alaska Airlines direct
24 Dec - 28 Dec Alaska Airlines
29 Dec - 02 Jan Alaska Airlines direct
21 Dec - 04 Jan Frontier Airlines
20 Dec - 22 Dec Frontier Airlines
18 Dec - 21 Dec Frontier Airlines direct
20 Dec - 27 Dec Frontier Airlines direct
27 Dec - 02 Jan Frontier Airlines direct
24 Dec - 28 Dec Alaska Airlines direct
20 Dec - 02 Jan Frontier Airlines
20 Dec - 02 Jan Frontier Airlines direct
28 Dec - 28 Dec Southwest Airlines
20 Dec - 22 Dec Alaska Airlines direct
19 Dec - 22 Dec Alaska Airlines direct

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

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