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

Use the “Price (lowest to highest)” filter on Expedia to look for cheap Frontier Airlines return flights from BIL to DEN. Affordable one-way options 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.

Frontier Airlines flights to Denver tend to be more affordable in the low-season months of January and November. Whether you’re after a round-trip or one-way ticket, you could land a better deal then.

For cheap Frontier Airlines fares from Logan Intl. Airport (BIL) to Denver Intl. Airport (DEN), 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 overall cost. Sunday is generally the most affordable, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking your flight 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.

Click on the “Nonstop” filter when searching for direct Frontier Airlines flights from BIL to DEN. It’s also a good way to compare other carriers servicing the same nonstop route.

To find the earliest departure from BIL to DEN with Frontier Airlines, sort your results by “Early Morning” and “Morning.” Booking an early flight usually means 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.

Frontier Airlines flights from Logan Intl. Airport (BIL) to Denver arrive at Denver Intl. Airport (DEN). This is the main gateway here.

A rewarding loyalty program and the ability to collect points through Frontier Miles are the start of the reasons to leave from BIL to DEN with Frontier Airlines. Plus, when you join Expedia’s free One Key™ program, you can receive OneKeyCash™* on top of Frontier Airlines’s loyalty program earnings. It’s yours to use wherever your next trip takes you.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Changes are generally free within 24 hours of booking, but your airline may charge you after that time. For further details about altering your flights, check out your “Trips,” select your flight and click on “Manage Booking.” If you’d like the flexibility to change your plans without extra charges, apply the “Changes included” and “No cancel fee” filters when organizing your next break.