$78 Cheap Frontier Airlines flights Denver (DEN) to Sioux Falls (FSD)

Make use of the "Price (lowest to highest)" filter on Expedia to search for cheap Frontier Airlines round-trip flights from $105 from DEN to FSD. Affordable one-way fares from $78 are available too.**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.

Start searching one to three months ahead of your travel date to score cheaper fares on Frontier Airlines flights from Denver Intl. Airport (DEN) to Sioux Falls Regional Airport (FSD). 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 cut 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.

Leaving DEN at 3:05PM UTC-7, the earliest Frontier Airlines flight to FSD lands at 5:43PM UTC-6. Traveling early means you're less likely to encounter cancellations or delays.* Not a morning person? The last Frontier Airlines flight from DEN to FSD departs at 3:05PM UTC-7 and touches down at 5:43PM UTC-6.*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.

A rewarding loyalty program and the ability to collect points through Frontier Miles are the start of the reasons to fly from DEN to FSD with Frontier Airlines. Plus, when you join our One Key™ program, you can receive OneKeyCash™* on top of any airline loyalty program earnings. You can put it toward your future trips.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.