$69 Cheap Southwest Airlines flights Denver (DEN) to Phoenix (PHX)

Make use of the "Price (lowest to highest)" filter on Expedia to find cheap Southwest Airlines return flights from $113 from DEN to PHX. Affordable one-way fares from $69 are also available.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

To find cheap Southwest Airlines fares from Denver Intl. Airport (DEN) to Sky Harbor Intl. Airport (PHX), start searching one to three months before your intended departure. Securing domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also impact what you pay. Sunday is typically the cheapest, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking your journey on a Sunday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.

The earliest Southwest Airlines flight from DEN to PHX departs at 5:55AM UTC-7, landing at 8:10AM UTC-7. If you prefer to jet off later, the last Southwest Airlines flight leaves DEN at 9:40PM UTC-7 and lands at PHX at 11:40PM UTC-7. Flying before noon is generally a smart choice as morning flights are less likely to experience cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.