$109 Cheap United flights Washington (DCA) to Denver (DEN)

Finding cheap one-way United Airlines flights from DCA to DEN from $109 on Expedia couldn’t be easier — just filter by “Price (lowest to highest).” Or check out our affordable round-trip fares from $203 for your next getaway.**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 return flights to Denver in January or November. You could find lower fares with United Airlines during these off-peak travel months.

Begin your search one to three months ahead of your departure date to find cheaper fares on United Airlines flights from Ronald Reagan Washington National Airport (DCA) 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 reduce costs by buying your fare on a Sunday, as it’s 6% cheaper on average than a Monday, the most expensive day to book.* Nail your timing, and you can enjoy significant savings on domestic journeys.*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.

United Airlines has direct flights from Ronald Reagan Washington National Airport (DCA) to Denver Intl. Airport (DEN), with 7 weekly departures. Simply select the “Nonstop” and “Airline” filters during your search on Expedia to show all direct United Airlines flights to DEN.

It takes approximately 4h 12m to travel nonstop from Ronald Reagan Washington National Airport (DCA) to Denver Intl. Airport (DEN) with United Airlines.

Departing DCA at 4:13PM UTC-5, the first United Airlines flight to DEN lands at 6:25PM UTC-7. Flying early means you’ll be less likely to encounter delays or cancellations.* Prefer to travel later? The last United Airlines flight from DCA to DEN departs at 4:13PM UTC-5 and touches down at 6:25PM 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 primary Denver hub for United Airlines flights from Ronald Reagan Washington National Airport (DCA).

With a rewarding loyalty program, United Airlines is a popular choice for many passengers heading from DCA to DEN. Plus, as a United Mileage Plus 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.

United Airlines generally uses Boeing 757-300 planes for flights from Ronald Reagan Washington National Airport (DCA) to Denver Intl. Airport (DEN). Remember that aircraft type can vary depending on operational demands, so the plane you catch might be different on your travel date.

Depending on the type of fare you purchased, a fee generally applies if you modify or cancel your flight more than 24 hours after it’s been confirmed. To secure plane tickets with more flexibility, select our “Changes included” or “No cancel fee” filter when searching for flights. To learn more about modifying or canceling your reservation, visit “Trips,” select your flight and click on “Manage Booking.”