Best Time to Fly ONT to HOU: On-Time Stats by Hour & Airline
Ontario International → William P Hobby
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 65.2% of Ontario (ONT) to Houston (HOU) flights arrived on time (362 scheduled flights). That is 12.4 points below the national average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
September has been the best month (98% on time) and Friday the weakest day of the week (64%).
0.0% of flights were cancelled, versus 1.8% nationally.
ONT to HOU 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 | 65.2% | 44 min | 0.0% | 362 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ONT to HOU
On-time arrival % by scheduled departure hour (local time), 725 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 96.5% | 0.0% | 85 |
| 6am–7am | 97.5% | 0.0% | 41 |
| 7am–8am | 96.9% | 0.0% | 64 |
| 8am–9am | 93.8% | 0.0% | 81 |
| 9am–10am | 81.6% | 0.0% | 49 |
| 10am–11am | Limited data | 31 | |
| 11am–12pm | 79.4% | 1.6% | 64 |
| 12pm–1pm | 59.5% | 0.0% | 84 |
| 1pm–2pm | 60.5% | 0.0% | 125 |
| 2pm–3pm | 36.5% | 0.0% | 96 |
| 3pm–4pm | Limited data | 5 | |
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 HOU
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 | 12 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 53.3% | -21.6 pts | 0.0% | 30 |
| Summer peak (Jun 15 - Aug 15) | 79.7% | +4.8 pts | 0.0% | 124 |
| All other days | 74.9% | — | 0.4% | 559 |
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).