Best Time to Fly AUS to IAD: On-Time Stats by Hour & Airline
Austin - Bergstrom International → Washington Dulles International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 89.7% of Austin (AUS) to Washington (IAD) flights arrived on time (1,042 scheduled flights). That is 12.1 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 (92% on time) and July the worst month (79%).
The cancellation rate was 1.0% (US average 1.8%).
AUS to IAD 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 | 90.6% | 79 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 AUS to IAD
On-time arrival % by scheduled departure hour (local time), 2,056 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | Limited data | 1 | |
| 7am–8am | 93.4% | 0.9% | 640 |
| 10am–11am | 95.1% | 1.6% | 124 |
| 11am–12pm | Limited data | 29 | |
| 12pm–1pm | 89.7% | 0.9% | 632 |
| 2pm–3pm | Limited data | 4 | |
| 3pm–4pm | Limited data | 16 | |
| 4pm–5pm | 84.9% | 0.7% | 306 |
| 5pm–6pm | 80.5% | 0.7% | 304 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on AUS to IAD
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) | 91.4% | +1.4 pts | 0.0% | 35 |
| Christmas & New Year (Dec 20 - Jan 3) | 95.0% | +5.0 pts | 0.0% | 40 |
| Summer peak (Jun 15 - Aug 15) | 81.3% | -8.7 pts | 1.6% | 378 |
| All other days | 90.0% | — | 0.8% | 1,603 |
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).