Route
LAS → IAD
Harry Reid International Airport Washington Dulles International Airport
2,065 miles
Return route IAD → LAS →
How punctual is this route?
- On-time arrivals
- 85.5%
- Less than 15 minutes late
- Cancelled
- 0.7%
- Of scheduled flights
- Average delay when late
- 66 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,070
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 42%
- Late-arriving aircraft 38%
- Air traffic control & airport 20%
- Extreme weather 0%
- 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 | 94.4% | 90 |
| October 2025 | 94.6% | 93 |
| November 2025 | 86.5% | 89 |
| December 2025 | 90.2% | 92 |
| January 2026 | 89.7% | 91 |
| February 2026 | 94.5% | 74 |
| March 2026 | 84.8% | 81 |
| April 2026 | 91.2% | 81 |
| May 2026 | 85.9% | 86 |
| June 2026 | 73.9% | 90 |
| July 2026 | 64.0% | 92 |
| August 2026 | 78.5% | 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 | 967 | 88.2% | 0.6% | 69 min |
| Frontier Airlines | 103 | 59.8% | 1.0% | 57 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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