$92 Cheap Frontier Airlines flights Green Bay (GRB) to Denver (DEN)

Apply the “Price (lowest to highest)” filter on Expedia to find cheap Frontier Airlines round-trip flights from $184 from GRB to DEN. Affordable one-way fares from $92 are available as well.**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 usually cheaper in the low-season months of January and November. Whether you need a one-way or round-trip ticket, you could score a better deal then.

Start searching one to three months ahead of your departure date to find cheaper fares on Frontier Airlines flights from Austin Straubel Intl. Airport (GRB) to Denver Intl. Airport (DEN). You can save 25% by booking your domestic flight 34 to 86 days in advance versus last-minute reservations made 6 to 12 days out. You could also reduce costs by buying your fare on a Sunday, as it’s 6% cheaper on average than a Monday, the most expensive day to book.* Get your timing right, 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.

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

Filter your results by “Morning” and “Early Morning” to find the earliest departures from GRB to DEN. Setting off 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.

Frontier Airlines flights from Austin Straubel Intl. Airport (GRB) to Denver come in to Denver Intl. Airport (DEN). This is the main entry point to this city.

A rewarding loyalty program and the chance to rack up points through Frontier Miles are the start of the reasons to jet off from GRB to DEN with Frontier Airlines. Plus, when you join Expedia’s free One Key™ program, you can earn OneKeyCash™* in addition to 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 often free within 24 hours of making your booking, but your airline may add a charge after that time. For more information about modifying your flights, go to your “Trips,” select your flight and click on “Manage Booking.” If you want the flexibility to change your itinerary without being charged, check the “Changes included” and “No cancel fee” filters when organizing your next adventure.