Best Time to Fly SLC to ONT: On-Time Stats by Hour & Airline
Salt Lake City International → Ontario International
Data through July 2026 · Last updated October 18, 2026
1,239 flights were scheduled from Salt Lake City (SLC) to Ontario (ONT) in the last 12 months, and 89.2% of those that flew arrived on time, 11.6 points above the US average of 77.6%.
Among 2 airlines, SkyWest Airlines led with 93.2% on time and Delta Air Lines was last with 87.7%.
Over 24 months, Wednesday was the most reliable day (92% on time) and February the worst month (84%).
The cancellation rate was 1.0% (US average 1.8%).
SLC 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 |
|---|---|---|---|---|
| SkyWest Airlines | 93.2% | 63 min | 0.3% | 310 |
| Delta Air Lines | 87.7% | 59 min | 1.1% | 899 |
| Frontier Airlines | Limited data | 30 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SLC to ONT
On-time arrival % by scheduled departure hour (local time), 2,426 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 94.9% | 0.9% | 218 |
| 9am–10am | Limited data | 12 | |
| 10am–11am | Limited data | 2 | |
| 11am–12pm | 87.9% | 0.7% | 733 |
| 12pm–1pm | Limited data | 8 | |
| 3pm–4pm | 93.6% | 0.6% | 689 |
| 4pm–5pm | Limited data | 2 | |
| 5pm–6pm | Limited data | 19 | |
| 6pm–7pm | Limited data | 5 | |
| 7pm–8pm | Limited data | 6 | |
| 8pm–9pm | 91.7% | 0.0% | 36 |
| 9pm–10pm | 87.2% | 0.0% | 117 |
| 10pm–11pm | 86.4% | 0.5% | 406 |
| 11pm–12am | 82.0% | 0.0% | 173 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SLC 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) | 85.0% | -5.2 pts | 0.0% | 40 |
| Christmas & New Year (Dec 20 - Jan 3) | 89.4% | -0.8 pts | 1.2% | 86 |
| Summer peak (Jun 15 - Aug 15) | 86.9% | -3.3 pts | 0.4% | 467 |
| All other days | 90.2% | — | 0.6% | 1,833 |
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).