Raleigh/Durham (RDU) to Denver (DEN) flights
Southwest Airlines, United Airlines, Frontier Airlines fly nonstop from Raleigh-Durham International Airport to Denver International Airport, with about 35 flights a week in July 2026. The 1,436-mile flight takes about 3h 50m gate to gate.
- Distance
- 1,436 mi · 2,311 km
- Flight time
- 3h 50m
- Airlines
- 3
- Seats filled
- 86%
Airlines flying RDU to DEN
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Southwest Airlines | 15 | Boeing 737 MAX 8, Boeing 737-800, Boeing 737-700 / MAX 7 | 97,838 | 3h 45m |
| United Airlines | 14 | Boeing 737-900ER, Boeing 737-800, Boeing 737 MAX 8 | 112,138 | 3h 54m |
| Frontier Airlines | 7 | Airbus A320neo, Airbus A321, Airbus A320-100/200 | 53,323 | 3h 52m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
RDU to DEN flight schedule
5 flight numbers flew this route in August 2026, 5 of them almost daily. The first usually leaves at 6:35am and the last at 4:23pm. Times are local and can change; check with the airline before you book.
| Flight | Departs | Arrives | Days flown in August 2026 | On time (12 months) |
|---|---|---|---|---|
| WN 3348Southwest Airlines | 6:35am | 8:10am | 24 | 100% |
| UA 2383United Airlines | 8:15am | 10:05am | 31 | 91% |
| F9 2225Frontier Airlines | 12:26pm | 2:19pm | 31 | 84% |
| WN 3349Southwest Airlines | 4:05pm | 5:45pm | 28 | 42% |
| UA 2288United Airlines | 4:23pm | 6:20pm | 31 | 82% |
Is RDU to DEN on time?
From September 2025 to August 2026, 82% of 1,734 flights arrived within 15 minutes of schedule and 0.7% were cancelled. Flights leaving around 12pm were the most punctual (96%), those around 6pm the least (56%). Most delay time was caused by late-arriving aircraft (44%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 727 | 88% | 12 min | 0.4% |
| Southwest Airlines | 710 | 75% | 15 min | 1% |
| Frontier Airlines | 297 | 85% | 13 min | 1% |
Airlines as sold: flights operated by regional partners count under the airline on the ticket. Average delay is across all completed flights, early arrivals counted as zero.
On-time arrivals by departure time
| Scheduled departure | Flights | On time, relative | On time |
|---|---|---|---|
| 5am to 6am | 183 | 91% | |
| 6am to 7am | 36 | 94% | |
| 7am to 8am | 114 | 93% | |
| 8am to 9am | 392 | 93% | |
| 12pm to 1pm | 93 | 96% | |
| 4pm to 5pm | 456 | 76% | |
| 5pm to 6pm | 171 | 74% | |
| 6pm to 7pm | 148 | 56% | |
| 7pm to 8pm | 84 | 69% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 160 | 24,210 | |
| September 2025 | 133 | 20,941 | |
| October 2025 | 136 | 20,999 | |
| November 2025 | 139 | 19,190 | |
| December 2025 | 146 | 22,341 | |
| January 2026 | 131 | 18,477 | |
| February 2026 | 126 | 18,044 | |
| March 2026 | 149 | 22,768 | |
| April 2026 | 147 | 20,854 | |
| May 2026 | 154 | 23,424 | |
| June 2026 | 154 | 25,819 | |
| July 2026 | 157 | 26,232 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.