Cheapest return flights from Portland to Denver in September from $187

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

Return flights

11 Sep - 15 Sep United direct
10 Sep - 14 Sep Alaska Airlines direct
11 Sep - 14 Sep Alaska Airlines direct

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

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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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