August is the cheapest month to fly this route, with average fares around $169 round trip.
Average round-trip fares by departure month, based on current availability.
| Month | Avg Price | Lowest | Relative Cost | |
|---|---|---|---|---|
| May 2026 | $198 | $108 | Peak | |
| June 2026 | $183 | $118 | ||
| July 2026 | $194 | $118 | ||
| August 2026 | $169 | $118 | Best |
Departing on Wednesday offers the lowest average fares at $179. Sunday departures are the most expensive at $200, a difference of $21.
The best time to fly is August. Set up an alert and we'll notify you when prices drop.
Get Started Free →The cheapest month to fly from Portland to Denver is August, with average round-trip fares around $169. The lowest fare found in August is $118.
Wednesday departures are the cheapest, averaging $179 round trip. The most expensive day is Sunday at $200.
Based on current pricing trends, booking for August travel offers the best value. Avoid May if possible, as fares average $198 compared to $169 in the cheapest month. July is a solid middle-ground option at $194.
Flying in August instead of May can save you approximately $29 per round trip. The cheapest month averages $169 while the most expensive averages $198.
Airlines, flight times, price calendar, and more for Portland to Denver
View PDX → DEN Details