Route
IAD → AUS
Washington Dulles International Airport Austin Bergstrom International Airport
1,297 miles
Return route AUS → IAD →
How punctual is this route?
- On-time arrivals
- 83.8%
- Less than 15 minutes late
- Cancelled
- 0.8%
- Of scheduled flights
- Average delay when late
- 77 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,018
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 39%
- Airline (crew, maintenance, cleaning) 28%
- Air traffic control & airport 28%
- Extreme weather 5%
- 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 | 92.7% | 109 |
| October 2025 | 92.1% | 89 |
| November 2025 | 87.2% | 79 |
| December 2025 | 76.6% | 77 |
| January 2026 | 83.3% | 71 |
| February 2026 | 88.0% | 76 |
| March 2026 | 84.8% | 92 |
| April 2026 | 89.0% | 82 |
| May 2026 | 84.1% | 88 |
| June 2026 | 73.6% | 88 |
| July 2026 | 79.3% | 89 |
| August 2026 | 71.8% | 78 |
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 | 987 | 84.5% | 0.8% | 78 min |
| Allegiant Air | 20 | 55.0% | 0.0% | 57 min |
| Republic Airways | 11 | 80.0% | 0.0% | 40 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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