Portland to Denver in September 2026

Dated one-way fares from Portland to Denver in September 2026. Use the calendar to see which days are cheaper.

Lowest this month $90

Highest this month $164

Sample fare $90

Airports PDX–DEN

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September 2026 price calendar

From $90 · up to $164

Mon

Tue

Wed

Thu

Fri

Sat

Sun

2 $154 3 $151 4 $155 5 $155 6 $159 7 $164 8 $155 9 $123 10 $123 11 $123 12 $123 13 $123 14 $123 15 $123 16 $123 17 $123 18 $90

Denver DEN

$90

Sep 18, 12:38pm · 2h 40m · 0 stops

PDX → DEN · Frontier Airlines

Denver DEN

$151

Sep 03, 12:20pm · 2h 43m · 0 stops

PDX → DEN · Frontier Airlines

This page is only September 2026 on the Portland to Denver route. Open the full route if you want the next months side by side.

Prices move as seats sell. Confirm the live itinerary before you book Portland to Denver in September 2026.