$224 Cheap United flights Moline (MLI) to Denver (DEN)

Set the "Price (lowest to highest)" filter on Expedia to search for cheap United Airlines round-trip flights from $209 from MLI to DEN. Affordable one-way options from $224 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.

Begin your search one to three months ahead of your travel date to score cheap fares on United Airlines flights from Quad City Intl. Airport (MLI) to Denver Intl. Airport (DEN). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to 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.* Time it well, 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.

The first flight from MLI to DEN with United Airlines departs at 8:40AM UTC-6. You'll land at 10:24AM UTC-7. The final United Airlines flight of the day leaves at 8:40AM UTC-6 and arrives at 10:24AM UTC-7. With approximately 20% fewer cancellations for early and mid-morning flights, setting off early is often the wisest option.**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 rack up points through United Mileage Plus are the start of the reasons to leave from MLI to DEN with United Airlines. Plus, when you sign up to our One Key™ program, you can earn OneKeyCash™* on top of any airline loyalty program earnings. It's yours to spend on future bookings.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.