Ontario (ONT) to Salt Lake City (SLC): On-Time Performance
Data through July 2026
Ontario (ONT) to Salt Lake City (SLC) is one of the more dependable pairings in US skies: 92% of arrivals are on time, 15 points clear of the national average, and the typical flight that does run late is only 7 minutes behind. Cancellations are rare at 0.9%. SkyWest Airlines is the standout carrier at 94% on-time.
- On-time
- 92%
- arrived <15 min late
- Avg delay
- 7 min
- completed flights
- Cancelled
- 0.9%
- Flights/day
- 3.4
- last 12 months
- Duration
- 1h 49m
- scheduled
- Distance
- 558 mi
Best airline from ONT to SLC
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlinesmost reliable | 94% | 6 min | 0.1% | 680 |
| Delta Air Lines | 92% | 7 min | 1.0% | 1,764 |
| Frontier Airlines | 85% | 10 min | 3.8% | 105 |
Monthly on-time trend
Best time to fly from ONT to SLC
Aim for departures around 9 a.m. (97% on-time); avoid 1 p.m. departures (89%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 92% | 5 min |
| Tuesdaybest | 95% | 6 min |
| Wednesday | 95% | 5 min |
| Thursday | 90% | 11 min |
| Friday | 93% | 8 min |
| Saturday | 93% | 8 min |
| Sunday | 91% | 7 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft35%
- Airline operations55%
- National airspace system4%
- Weather6%
Frequently asked questions
- How often are flights from ONT to SLC delayed?
- 8% of ONT–SLC flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 7 minutes.
- Which airline is most reliable from ONT to SLC?
- SkyWest Airlines has the best on-time record on this route at 94%, based on 680 flights. 3 airlines flew ONT–SLC frequently enough to compare in this period.
- What is the best time of day to fly from ONT to SLC?
- Departures around 9 a.m. have the best record (97% on-time), while departures around 1 p.m. have the worst (89%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ONT to SLC?
- The scheduled ONT–SLC flight time averages 1h 49m over 558 miles. Actual arrival times vary — flights on this route land 15+ minutes late 8% of the time.
- How often are ONT to SLC flights cancelled?
- 0.9% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What day of the week is most reliable for ONT to SLC?
- Tuesday flights have the best record at 95% on-time. Day-of-week differences on this route are modest.
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Based on 2,549 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.