August is the cheapest month to fly this route, with average fares around $122 round trip.
Average round-trip fares by departure month, based on current availability.
| Month | Avg Price | Lowest | Relative Cost | |
|---|---|---|---|---|
| May 2026 | $147 | $112 | Peak | |
| June 2026 | $126 | $112 | ||
| July 2026 | $126 | $112 | ||
| August 2026 | $122 | $112 | Best |
Departing on Wednesday offers the lowest average fares at $113. Sunday departures are the most expensive at $145, a difference of $32.
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 Phoenix to Denver is August, with average round-trip fares around $122. The lowest fare found in August is $112.
Wednesday departures are the cheapest, averaging $113 round trip. The most expensive day is Sunday at $145.
Based on current pricing trends, booking for August travel offers the best value. Avoid May if possible, as fares average $147 compared to $122 in the cheapest month. July is a solid middle-ground option at $126.
Flying in August instead of May can save you approximately $25 per round trip. The cheapest month averages $122 while the most expensive averages $147.
Airlines, flight times, price calendar, and more for Phoenix to Denver
View PHX → DEN Details