$99 Cheap Frontier Airlines flights Milwaukee (MKE) to Denver (DEN)

Use the “Price (lowest to highest)” filter on Expedia to search for cheap Frontier Airlines round-trip flights from $179 from MKE to DEN. Affordable one-way tickets from $99 are also on offer.**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 more affordable 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.

Look for affordable Frontier Airlines flights from General Mitchell Intl. Airport (MKE) to Denver Intl. Airport (DEN) one to three months ahead of your day of departure. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. Regardless of fare type and itinerary, the ideal day to book a domestic flight is usually Sunday and the most expensive day is typically Monday. Passengers who book on a Sunday can save 6% on average compared to those who book their travel on a Monday.**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.

Fill in your dates, press search and select “Nonstop” on Expedia to browse any direct flights from MKE to DEN with Frontier Airlines or other carriers.

To find the earliest departures from MKE to DEN with Frontier Airlines, filter your results by “Early Morning” and “Morning.” Choosing an early flight generally means you’ll experience fewer 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.

Hop on a Frontier Airlines flight from General Mitchell Intl. Airport (MKE) to Denver, and you’ll most likely come in to Denver Intl. Airport (DEN). This is the airline’s primary hub in this destination.

With a rewarding loyalty program, Frontier Airlines is a popular choice for many travelers journeying from MKE to DEN. Plus, as a Frontier Miles and One Key™ member booking through Expedia, you can earn OneKeyCash™* on eligible flights on top of your airline miles.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Changes are usually free within 24 hours of making a booking, but your airline may add a charge after that. For more details about altering your flights, go to your “Trips,” select your flight and click on “Manage Booking.” If you’d like the freedom to change your plans without being charged, check the “Changes included” or “No cancel fee” filter when organizing your next break.