Best Time to Fly IAD to AUS: On-Time Stats by Hour & Airline
Washington Dulles International → Austin - Bergstrom International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 84.8% of Washington (IAD) to Austin (AUS) flights arrived on time (1,042 scheduled flights). That is 7.2 points above the national average of 77.6%.
United Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Tuesday was the most reliable day (86% on time) and June the worst month (68%).
The cancellation rate was 1.0% (US average 1.8%).
IAD to AUS on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| United Airlines | 85.4% | 64 min | 1.0% | 1,004 |
| Republic Airways | Limited data | 14 | ||
| Allegiant Air | Limited data | 24 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly IAD to AUS
On-time arrival % by scheduled departure hour (local time), 2,061 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 91.6% | 1.0% | 603 |
| 9am–10am | Limited data | 2 | |
| 10am–11am | Limited data | 14 | |
| 12pm–1pm | 88.2% | 1.1% | 180 |
| 1pm–2pm | 84.3% | 0.2% | 431 |
| 3pm–4pm | 73.5% | 1.2% | 84 |
| 4pm–5pm | 58.2% | 0.0% | 55 |
| 5pm–6pm | 74.2% | 0.8% | 606 |
| 6pm–7pm | 73.6% | 2.7% | 74 |
| 7pm–8pm | Limited data | 4 | |
| 10pm–11pm | Limited data | 8 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on IAD to AUS
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 94.1% | +10.4 pts | 0.0% | 35 |
| Christmas & New Year (Dec 20 - Jan 3) | 92.5% | +8.8 pts | 0.0% | 40 |
| Summer peak (Jun 15 - Aug 15) | 73.6% | -10.2 pts | 1.6% | 378 |
| All other days | 83.8% | — | 0.8% | 1,608 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).