Las Vegas (LAS) to Dulles (IAD) flights
United Airlines, Frontier Airlines fly nonstop from Harry Reid International Airport to Washington Dulles International Airport, with about 20 flights a week in July 2026. The 2,065-mile flight takes about 4h 23m gate to gate.
- Distance
- 2,065 mi · 3,323 km
- Flight time
- 4h 23m
- Airlines
- 2
- Seats filled
- 86%
Airlines flying LAS to IAD
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| United Airlines | 13 | Boeing 737-900ER, Boeing 737 MAX 9, Boeing 737-800 | 151,091 | 4h 22m |
| Frontier Airlines | 7 | Airbus A321, Airbus A320neo, Airbus A320-100/200 | 18,160 | 4h 29m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
LAS to IAD flight schedule
5 flight numbers flew this route in August 2026, 3 of them almost daily. The first usually leaves at 12:46am and the last at 11:57pm. 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) |
|---|---|---|---|---|
| F9 4278Frontier Airlines | 12:46am | 8:20am | 31 | 60% |
| UA 1140United Airlines | 8:20am | 3:58pm | 31 | 88% |
| UA 2382United Airlines | 1:23pm | 9:06pm | 10 | 81% |
| UA 2630United Airlines | 1:23pm | 9:01pm | 21 | 81% |
| UA 284United Airlines | 11:57pm | 7:30am | 18 | 94% |
Is LAS to IAD on time?
From September 2025 to August 2026, 86% of 1,070 flights arrived within 15 minutes of schedule and 0.7% were cancelled. Flights leaving around 11pm were the most punctual (93%), those around 12am the least (60%). Most delay time was caused by the airline (crew, maintenance, cleaning, fuelling) (40%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 967 | 88% | 8 min | 0.6% |
| Frontier Airlines | 103 | 60% | 23 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 |
|---|---|---|---|
| 12am to 1am | 103 | 60% | |
| 8am to 9am | 361 | 92% | |
| 1pm to 2pm | 339 | 82% | |
| 2pm to 3pm | 24 | 70% | |
| 10pm to 11pm | 26 | 96% | |
| 11pm to 12am | 215 | 93% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 119 | 18,644 | |
| September 2025 | 91 | 13,602 | |
| October 2025 | 93 | 15,017 | |
| November 2025 | 89 | 13,419 | |
| December 2025 | 92 | 14,107 | |
| January 2026 | 87 | 13,130 | |
| February 2026 | 74 | 11,202 | |
| March 2026 | 79 | 13,026 | |
| April 2026 | 80 | 13,760 | |
| May 2026 | 85 | 13,466 | |
| June 2026 | 88 | 15,125 | |
| July 2026 | 89 | 14,823 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.