Cheapest one-way flights from Portland to Denver in December from $108

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

One-Way flights

22 Dec Frontier Airlines
29 Dec Frontier Airlines
31 Dec Frontier Airlines
25 Dec Frontier Airlines direct
30 Dec Frontier Airlines
18 Dec Frontier Airlines
19 Dec Frontier Airlines
30 Dec Frontier Airlines direct
21 Dec Frontier Airlines
27 Dec Frontier Airlines direct

Also check the deals for return flights from Portland 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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