Best Time to Fly ONT to AUS: On-Time Stats by Hour & Airline
Ontario International → Austin - Bergstrom International
Data through July 2026 · Last updated October 18, 2026
337 flights were scheduled from Ontario (ONT) to Austin (AUS) in the last 12 months, and 74.3% of those that flew arrived on time, 3.3 points below the US average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
September has been the best month (95% on time) and Friday the weakest day of the week (79%).
0.3% of flights were cancelled, versus 1.8% nationally.
ONT 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 |
|---|---|---|---|---|
| Southwest Airlines | 74.5% | 40 min | 0.3% | 336 |
| SkyWest Airlines | Limited data | 1 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ONT to AUS
On-time arrival % by scheduled departure hour (local time), 708 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 93.2% | 0.0% | 44 |
| 7am–8am | 86.4% | 0.0% | 44 |
| 8am–9am | Limited data | 22 | |
| 9am–10am | 79.1% | 0.0% | 135 |
| 10am–11am | 85.1% | 0.5% | 196 |
| 11am–12pm | 75.3% | 1.3% | 79 |
| 12pm–1pm | 75.9% | 0.0% | 83 |
| 1pm–2pm | 77.8% | 0.0% | 36 |
| 2pm–3pm | 66.7% | 0.0% | 42 |
| 3pm–4pm | Limited data | 25 | |
| 4pm–5pm | Limited data | 2 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ONT 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) | Limited data | 13 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 70.0% | -13.7 pts | 0.0% | 30 |
| Summer peak (Jun 15 - Aug 15) | 69.7% | -14.0 pts | 0.0% | 124 |
| All other days | 83.7% | — | 0.4% | 541 |
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).