$34 Cheap Frontier Airlines flights Boise (BOI) to Denver (DEN)

Set the “Price (lowest to highest)” filter on Expedia to find cheap Frontier Airlines return flights from $68 from BOI to DEN. Affordable one-way fares from $34 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.

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

Start searching one to three months before your departure to find cheap fares on Frontier Airlines flights from Boise Airport (BOI) to Denver Intl. Airport (DEN). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to last-minute reservations made 6 to 12 days out. You could also cut costs by buying your fare on a Sunday, as it’s 6% cheaper on average than a Monday, the most expensive day to book.* Time it well, and you can enjoy significant savings on domestic trips.*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 journey from BOI to DEN with Frontier Airlines or any other carriers, select the “Nonstop” filter when looking for flights.

Sort your results by “Early Morning” and “Morning” to browse the earliest flights from BOI to DEN. Leaving early means flight cancellations are less likely.**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.

Jump on a Frontier Airlines flight from Boise Airport (BOI) to Denver, and you’ll most likely arrive at Denver Intl. Airport (DEN). This is the airline’s primary hub in this city.

A rewarding loyalty program and the chance to rack up points through Frontier Miles are the start of the reasons to travel from BOI to DEN with Frontier Airlines. Plus, by joining Expedia’s free One Key™ program, you can earn OneKeyCash™* alongside 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.

Changes are typically free within 24 hours of making a booking, but your airline may add a charge after that time. For more information about modifying your reservation, go to your “Trips,” select your flight and click on “Manage Booking.” If you’d like the freedom to change your itinerary without additional charges, apply the “Changes included” and “No cancel fee” filters when planning your trip.