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One of the busiest routes in the Southwest, flying from Denver (DEN) to Phoenix (PHX), is frequented by business travelers, tourists, and weekenders due to the numerous non-stop daily flights and numerous carriers offering them. With an average flight time of just under 2 hours, it's a short trip. Airline competition keeps the prices down as well, especially when you book tickets early. Business, vacation, outdoor pursuits, or warm weather and resort getaways, this route allows for easy, comfortable, and connected access to Phoenix year-round.

Because of a fare war for this route, you can snag a cheap ticket with little effort. Here’s how to save money:

There are about 600 air miles between Denver and Phoenix. With such different climates and seasons for travel and business between the two cities, you would expect to see plenty of different price fluctuations throughout the year.
January – Great Prices After the Holidays
With the post-holiday lull, prices drop after demand for flights reduces. January is the best month to fly this route at one of the lowest average prices, between $55 and $180.
February–March – Prices Climb for Spring Events
With a steep demand increase and expensive weekend flights, this is the time of year to get your tickets early for things like the Phoenix Open or MLB Spring Training.
April – Moderate and Mixed
Traffic is returning to normal after Spring Break, and prices start to behave again. The heat in Phoenix draws people to travel again after the spring, so prices can increase again at the start of the week. These can be some of the better prices available.
May–June – Watch for Deals, But Expect Variation
Since summer arrives first in Phoenix, and this can drive people away from travel, take advantage of the depressed demand in May for a good deal. The price in June can be pretty up and down, from a medium price to a high price.
July: The Most Expensive Month
July is usually the most costly month to fly from DEN to PHX given increased demand for summer holidays. Plan to fly in July? Book your flights 6-8 weeks in advance.
August: Minor Price Reduction
Flights in early August can be marginally cheaper than in July since the holiday rush begins to dissipate. Flexibility can help travelers take advantage of limited good deals, especially midweek flights.
September-October: The Best Months to Travel
Fall demand for travel drops, and weather in Phoenix gets nice. October is historically the best month of the year to fly this route.
November: The Holiday Rush Begins
Thanksgiving brings an increase in ticket prices. To avoid paying the holiday price surge, book your flights in November 5-6 weeks in advance.
December: Highest Prices of The Year
Traveling to see family for the holidays and the first wave of the annual snowbird migration pushes airfare to the highest prices of the year. Reserve your tickets 6-8 weeks in advance and try alternate travel dates of December 23rd and 26th to save some money.