Cheapest return flights from Portland to Denver in January from $58

AirHint found the following cheapest return flights from Portland (PDX) to Denver (DEN) in January 2026 (see full year).

Return flights

08 Jan - 11 Jan Frontier Airlines direct
16 Jan - 18 Jan Frontier Airlines direct
08 Jan - 15 Jan Frontier Airlines direct
15 Jan - 18 Jan Frontier Airlines direct
17 Jan - 20 Jan United direct
22 Jan - 25 Jan Alaska Airlines
16 Jan - 20 Jan Frontier Airlines
16 Jan - 20 Jan United direct
17 Jan - 19 Jan United direct
29 Jan - 05 Feb Frontier Airlines
01 Jan - 08 Jan Frontier Airlines direct
29 Jan - 05 Feb United direct

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

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