$109 Cheap United flights Raleigh (RDU) to Denver (DEN)

Landing cheap one-way United Airlines flights from RDU to DEN from $109 on Expedia is simple — just filter by “Price (lowest to highest).” Or check out our affordable return fares from $217 for your next adventure.**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.

United Airlines flights to Denver are often more affordable in the off-peak months of January and November. Whether you’re after a one-way or round-trip ticket, you could score a better deal then.

For cheap United Airlines fares from Raleigh - Durham Intl. Airport (RDU) 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 impact what you pay. Sunday is typically the most affordable, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking your trip 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.

Skip the layovers and fly from Raleigh - Durham Intl. Airport (RDU) to Denver Intl. Airport (DEN) on one of United Airlines’s 14 direct weekly flights. Use Expedia’s “Nonstop” and “Airline” filters to find the United Airlines flight that’ll land at DEN at a time that suits you.

Leave Raleigh - Durham Intl. Airport (RDU) for Denver Intl. Airport (DEN) on a direct United Airlines flight, and you’ll be in the sky for about 4h 8m.

United Airlines has the most flights from Raleigh - Durham Intl. Airport (RDU) to Denver Intl. Airport (DEN) on Saturday. With up to 2 daily departures, you’ll get the most options and flexibility on this day.

Setting off from RDU at 8:00AM UTC-5, the earliest United Airlines flight to DEN arrives at 10:08AM UTC-7. Flying early means you’ll be less likely to encounter cancellations or delays.* Prefer to travel later? The last United Airlines flight from RDU to DEN departs at 4:00PM UTC-5 and touches down at 6:09PM UTC-7.*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 United Airlines flights from Raleigh - Durham Intl. Airport (RDU).

A rewarding loyalty program and the chance to rack up points through United Mileage Plus are the start of the reasons to leave from RDU to DEN with United Airlines. Plus, when you join our One Key™ program, you can receive OneKeyCash™* alongside United Airlines’s loyalty program earnings. It’s yours to spend on your next adventure.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

You’ll likely be onboard a Boeing 737-800 or a Boeing 737 MAX 9 when flying United Airlines from Raleigh - Durham Intl. Airport (RDU) to Denver Intl. Airport (DEN). However, keep in mind that a different plane may be assigned due to operational reasons.

Changes are often free within 24 hours of booking, but your airline may charge a fee 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 freedom to update your itinerary without being charged, apply the “Changes included” and “No cancel fee” filters when planning your next escape.