Dulles (IAD) to Las Vegas (LAS) flights
United Airlines, Frontier Airlines fly nonstop from Washington Dulles International Airport to Harry Reid International Airport, with about 21 flights a week in July 2026. The 2,065-mile flight takes about 5h 4m gate to gate.
- Distance
- 2,065 mi · 3,323 km
- Flight time
- 5h 4m
- Airlines
- 2
- Seats filled
- 83%
Airlines flying IAD to LAS
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| United Airlines | 14 | Boeing 737-900ER, Boeing 737 MAX 9, Boeing 737-800 | 146,886 | 5h 5m |
| Frontier Airlines | 7 | Airbus A321, Airbus A320neo, Airbus A320-100/200 | 18,975 | 4h 50m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
IAD to LAS flight schedule
5 flight numbers flew this route in August 2026, 3 of them almost daily. The first usually leaves at 9:00am and the last at 8:10pm. 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) |
|---|---|---|---|---|
| UA 1323United Airlines | 9:00am | 11:04am | 21 | 96% |
| F9 4277Frontier Airlines | 9:50am | 11:45am | 31 | 60% |
| UA 2156United Airlines | 12:55pm | 2:59pm | 31 | 89% |
| UA 2209United Airlines | 6:00pm | 8:08pm | 18 | 61% |
| UA 1764United Airlines | 8:10pm | 10:19pm | 10 | 75% |
Is IAD to LAS on time?
From September 2025 to August 2026, 85% of 1,069 flights arrived within 15 minutes of schedule and 0.6% were cancelled. Flights leaving around 1pm were the most punctual (91%), those around 8pm the least (74%). Most delay time was caused by late-arriving aircraft (46%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 965 | 88% | 10 min | 0.5% |
| Frontier Airlines | 104 | 60% | 20 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 |
|---|---|---|---|
| 8am to 9am | 138 | 90% | |
| 9am to 10am | 243 | 84% | |
| 12pm to 1pm | 280 | 88% | |
| 1pm to 2pm | 84 | 91% | |
| 7pm to 8pm | 188 | 88% | |
| 8pm to 9pm | 99 | 74% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 118 | 16,976 | |
| September 2025 | 91 | 13,476 | |
| October 2025 | 93 | 14,174 | |
| November 2025 | 89 | 12,766 | |
| December 2025 | 92 | 14,541 | |
| January 2026 | 86 | 12,614 | |
| February 2026 | 74 | 11,192 | |
| March 2026 | 79 | 12,864 | |
| April 2026 | 81 | 13,170 | |
| May 2026 | 86 | 12,998 | |
| June 2026 | 90 | 14,747 | |
| July 2026 | 93 | 16,506 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.