Best Time to Fly ONT to SMF: On-Time Stats by Hour & Airline
Ontario International → Sacramento International
Data through July 2026 · Last updated October 18, 2026
2,114 flights were scheduled from Ontario (ONT) to Sacramento (SMF) in the last 12 months, and 85.6% of those that flew arrived on time, 8.0 points above the US average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
August has been the best month (93% on time) and Sunday the weakest day of the week (81%).
0.3% of flights were cancelled, versus 1.8% nationally.
ONT to SMF 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 | 85.6% | 51 min | 0.3% | 2,114 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ONT to SMF
On-time arrival % by scheduled departure hour (local time), 4,216 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 98.8% | 0.0% | 82 |
| 6am–7am | 97.2% | 0.0% | 397 |
| 7am–8am | 96.7% | 0.4% | 241 |
| 8am–9am | 96.6% | 0.8% | 390 |
| 9am–10am | 95.8% | 0.5% | 215 |
| 10am–11am | 94.4% | 0.4% | 269 |
| 11am–12pm | 85.8% | 0.5% | 184 |
| 12pm–1pm | 89.0% | 0.6% | 321 |
| 1pm–2pm | 80.1% | 0.0% | 266 |
| 2pm–3pm | 90.0% | 0.0% | 80 |
| 3pm–4pm | 72.7% | 0.5% | 221 |
| 4pm–5pm | 85.7% | 0.0% | 286 |
| 5pm–6pm | 88.1% | 0.5% | 194 |
| 6pm–7pm | 77.8% | 0.0% | 433 |
| 7pm–8pm | 83.6% | 0.0% | 226 |
| 8pm–9pm | 76.0% | 0.3% | 347 |
| 9pm–10pm | 71.4% | 0.0% | 56 |
| 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 ONT to SMF
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) | 91.9% | +4.0 pts | 1.3% | 75 |
| Christmas & New Year (Dec 20 - Jan 3) | 80.1% | -7.8 pts | 0.0% | 161 |
| Summer peak (Jun 15 - Aug 15) | 85.1% | -2.8 pts | 0.6% | 730 |
| All other days | 87.9% | — | 0.2% | 3,250 |
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).