Best Time to Fly AUS to ONT: On-Time Stats by Hour & Airline
Austin - Bergstrom International → Ontario International
Data through July 2026 · Last updated October 18, 2026
335 flights were scheduled from Austin (AUS) to Ontario (ONT) in the last 12 months, and 74.5% of those that flew arrived on time, 3.2 points below the US average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Tuesday was the most reliable day (89% on time) and June the worst month (60%).
The cancellation rate was 0.6% (US average 1.8%).
AUS to ONT 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% | 47 min | 0.6% | 335 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly AUS to ONT
On-time arrival % by scheduled departure hour (local time), 706 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | Limited data | 1 | |
| 10am–11am | Limited data | 7 | |
| 11am–12pm | Limited data | 19 | |
| 12pm–1pm | Limited data | 1 | |
| 1pm–2pm | 87.6% | 0.8% | 130 |
| 2pm–3pm | 76.1% | 0.0% | 113 |
| 3pm–4pm | 81.9% | 0.0% | 94 |
| 4pm–5pm | 73.9% | 0.0% | 234 |
| 5pm–6pm | Limited data | 8 | |
| 6pm–7pm | Limited data | 5 | |
| 7pm–8pm | 68.6% | 0.0% | 35 |
| 8pm–9pm | 71.4% | 2.0% | 50 |
| 9pm–10pm | Limited data | 9 | |
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 ONT
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) | 83.3% | +4.0 pts | 0.0% | 30 |
| Summer peak (Jun 15 - Aug 15) | 70.7% | -8.6 pts | 0.8% | 124 |
| All other days | 79.4% | — | 0.2% | 539 |
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).