Cheap Frontier Airlines flights Louisville (SDF) to Denver (DEN)

Make use of the “Price (lowest to highest)” filter on Expedia to search for cheap Frontier Airlines return flights from SDF to DEN. Affordable one-way tickets 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.

Browse for one-way or round-trip flights to Denver in January or November. You could find cheaper fares with Frontier Airlines during these off-peak travel months.

To find cheap Frontier Airlines fares from Louisville Intl. Airport (SDF) 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 how much you pay. Sunday is typically the cheapest, 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.

Use our “Nonstop” filter when looking for direct Frontier Airlines flights from SDF to DEN. It’s also an easy way to compare other airlines servicing the same nonstop route.

Filter your results by “Early Morning” and “Morning” to browse the earliest departures from SDF to DEN. Heading 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.

Denver Intl. Airport (DEN) is the main Denver hub for Frontier Airlines flights from Louisville Intl. Airport (SDF).

Offering a rewarding loyalty program, Frontier Airlines is a top pick for many travelers journeying from SDF to DEN. Plus, if you’re a Frontier Miles and One Key™ member booking through Expedia, you could earn OneKeyCash™* on eligible flights along with your airline miles.*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 charge a fee after that. For more details about altering your flights, go to your “Trips,” select your flight and click on “Manage Booking.” If you want the flexibility to change your plans without extra charges, apply the “No cancel fee” or “Changes included” filter when organizing your next trip.