Best Time to Fly SMF to ONT: On-Time Stats by Hour & Airline
Sacramento International → Ontario International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 84.4% of Sacramento (SMF) to Ontario (ONT) flights arrived on time (2,115 scheduled flights). That is 6.7 points above the national average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
August has been the best month (91% on time) and Thursday the weakest day of the week (83%).
0.4% of flights were cancelled, versus 1.8% nationally.
SMF 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 | 84.4% | 52 min | 0.4% | 2,115 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SMF to ONT
On-time arrival % by scheduled departure hour (local time), 4,222 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 97.0% | 0.8% | 133 |
| 6am–7am | 97.0% | 0.7% | 439 |
| 7am–8am | 97.3% | 0.7% | 148 |
| 8am–9am | 91.5% | 0.7% | 271 |
| 9am–10am | 92.8% | 0.3% | 349 |
| 10am–11am | 91.5% | 0.8% | 251 |
| 11am–12pm | 88.1% | 0.0% | 252 |
| 12pm–1pm | 86.5% | 0.0% | 267 |
| 1pm–2pm | 85.2% | 0.0% | 202 |
| 2pm–3pm | 84.1% | 0.6% | 171 |
| 3pm–4pm | 81.8% | 0.4% | 243 |
| 4pm–5pm | 79.4% | 0.0% | 228 |
| 5pm–6pm | 79.9% | 0.5% | 190 |
| 6pm–7pm | 82.4% | 0.0% | 386 |
| 7pm–8pm | 78.7% | 0.4% | 232 |
| 8pm–9pm | 75.6% | 0.0% | 365 |
| 9pm–10pm | 63.8% | 0.0% | 94 |
| 10pm–11pm | Limited data | 1 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SMF 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) | 87.8% | +0.1 pts | 0.0% | 75 |
| Christmas & New Year (Dec 20 - Jan 3) | 69.4% | -18.3 pts | 0.6% | 161 |
| Summer peak (Jun 15 - Aug 15) | 82.5% | -5.2 pts | 1.1% | 730 |
| All other days | 87.7% | — | 0.1% | 3,256 |
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).