$85 Cheap Frontier Airlines flights Tucson (TUS) to Denver (DEN)

Scoring cheap one-way Frontier Airlines flights from TUS to DEN from $85 on Expedia couldn’t be easier — just filter by “Price (lowest to highest).” Or check out our affordable return fares from $147 for your next exciting vacation.**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.

Frontier Airlines flights to Denver are typically cheaper in the off-peak months of January and November. Whether you’re after a one-way or round-trip ticket, you could find a better deal then.

Look for affordable Frontier Airlines flights from Tucson Intl. Airport (TUS) 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. No matter the fare class and journey, the ideal day to book a domestic flight is usually Sunday and the most expensive 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.

Enter your dates, press search and select “Nonstop” on Expedia to find any direct flights from TUS to DEN with Frontier Airlines or other carriers.

Filter your results by “Morning” and “Early Morning” to browse the earliest departures from TUS to DEN. Jetting off early means you’re 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.

Frontier Airlines flights from Tucson Intl. Airport (TUS) to Denver touch down at Denver Intl. Airport (DEN). This is the main gateway to this city.

A rewarding loyalty program and the opportunity to collect points through Frontier Miles are the start of the reasons to jet off from TUS to DEN with Frontier Airlines. Plus, when you join our One Key™ program, you can earn OneKeyCash™* on top of Frontier Airlines’s loyalty program earnings. It’s yours to spend on future bookings.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Typically, you can modify or cancel your flight, although there may be additional charges if you booked over 24 hours ago. Need flexible options? Apply the “Changes included” and “No cancel fee” filters to find flights that won’t charge extra if you have to alter your plans. To make changes, go to “Trips,” select your flight and click on “Manage Booking” for more details.