Route
IAD → LAS
Washington Dulles International Airport Harry Reid International Airport
2,065 miles
Return route LAS → IAD →
How punctual is this route?
- On-time arrivals
- 85.3%
- Less than 15 minutes late
- Cancelled
- 0.6%
- Of scheduled flights
- Average delay when late
- 76 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,069
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 46%
- Airline (crew, maintenance, cleaning) 26%
- Air traffic control & airport 20%
- Extreme weather 7%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Sep 2025
Aug 2026
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 91.2% | 91 |
| October 2025 | 87.1% | 93 |
| November 2025 | 93.3% | 89 |
| December 2025 | 91.3% | 92 |
| January 2026 | 84.9% | 90 |
| February 2026 | 90.5% | 74 |
| March 2026 | 88.6% | 80 |
| April 2026 | 95.1% | 81 |
| May 2026 | 87.2% | 86 |
| June 2026 | 71.1% | 90 |
| July 2026 | 75.0% | 92 |
| August 2026 | 73.4% | 111 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| United Airlines | 965 | 88.0% | 0.5% | 85 min |
| Frontier Airlines | 104 | 60.2% | 1.0% | 50 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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