$79 Cheap Southwest Airlines flights Austin (AUS) to Denver (DEN)

Make use of the "Price (lowest to highest)" filter on Expedia to look for cheap Southwest Airlines round-trip flights from $149 from AUS to DEN. Affordable one-way options from $79 are available as well.**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.

Look for affordable Southwest Airlines flights from Austin-Bergstrom Intl. Airport (AUS) to Denver Intl. Airport (DEN) one to three months before your departure date. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. Regardless of fare class and itinerary, the ideal day to book a domestic flight is generally Sunday and the most expensive day is typically Monday. Passengers who book on a Sunday can save 6% on average compared to those who book their travel on a Monday.**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.

Departing AUS at 5:50AM UTC-6, the earliest Southwest Airlines flight to DEN lands at 7:05AM UTC-7. Traveling early means you'll be less likely to encounter delays or cancellations.* Not an early riser? The last Southwest Airlines flight from AUS to DEN departs at 7:30PM UTC-6 and touches down at 8:50PM UTC-7.*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.