$99 Cheap Frontier Airlines flights Buffalo (BUF) to Denver (DEN)

Landing cheap one-way Frontier Airlines flights from BUF to DEN from $99 on Expedia couldn’t be simpler — just filter by “Price (lowest to highest).” Or check out our budget-friendly round-trip fares from $179 for your next exciting getaway.**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 round-trip or one-way flights to Denver in January or November. You could find cheaper fares with Frontier Airlines during these off-peak travel months.

For cheap Frontier Airlines fares from Buffalo Niagara Intl. Airport (BUF) to Denver Intl. Airport (DEN), start searching one to three months before your intended 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 impact the overall cost. Sunday is typically the cheapest, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking your trip 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.

Use the “Nonstop” filter when browsing for direct Frontier Airlines flights from BUF to DEN. You can also compare other carriers servicing the same direct trip.

Sort your results by “Morning” and “Early Morning” to see the earliest departures from BUF to DEN. Heading 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.

Denver Intl. Airport (DEN) is the primary Denver hub for Frontier Airlines flights from Buffalo Niagara Intl. Airport (BUF).

A rewarding loyalty program and the ability to rack up points through Frontier Miles are the start of the reasons to travel from BUF to DEN with Frontier Airlines. Plus, by joining Expedia’s free One Key™ program, you can earn OneKeyCash™* on top of Frontier Airlines’s loyalty program earnings. It’s yours to spend on future travel plans.*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 booking, but your airline may charge you after that time. For more information about altering your reservation, go to your “Trips,” select your flight and click on “Manage Booking.” If you’d like the flexibility to change your plans without being charged, apply the “No cancel fee” or “Changes included” filter when planning your next getaway.