Cheap Frontier Airlines flights Denver (DEN) to Billings (BIL)

Apply the “Price (lowest to highest)” filter on Expedia to look for cheap Frontier Airlines round-trip flights from DEN to BIL. Affordable one-way options are available too.**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.

Browse for round-trip or one-way flights to Billings in January or November. You could find an affordable fare with Frontier Airlines during these off-peak travel months.

For cheap Frontier Airlines fares from Denver Intl. Airport (DEN) to Logan Intl. Airport (BIL), start searching one to three months before your planned 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 affect the cost. Sunday is usually the cheapest, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking 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.

To find out if there’s a direct trip from DEN to BIL with Frontier Airlines or any other carriers, check the “Nonstop” filter when browsing for flights.

Sort your results by “Early Morning” and “Morning” to see the earliest departures from DEN to BIL. Jetting off early means you’re 20% 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.

Board a Frontier Airlines flight from Denver Intl. Airport (DEN) to Billings, and you’ll most likely touch down at Logan Intl. Airport (BIL). This is the airline’s primary hub in this destination.

Fly from DEN to BIL with Frontier Airlines and look forward to a range of benefits including a rewarding loyalty program. When you book through Expedia as a Frontier Miles and One Key™ member, you can also earn OneKeyCash™* to redeem on select future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Depending on the type of fare you purchased, a fee typically applies if you cancel or change your flight more than 24 hours after it’s been confirmed. To find flexible fares, select our “Changes included” or “No cancel fee” filter while searching for flights. For more details on canceling or changing your reservation, visit “Trips,” select your flight and click on “Manage Booking.”