ONT to SLC flight delays
Ontario, CA (ONT) Salt Lake City, UT (SLC) · 558 miles
113 flights · March 2025 – August 2026 · US Bureau of Transportation Statistics
96.46%
Arrived on time
Within 15 minutes of schedule
0%
Cancelled
Share of scheduled flights
30 min
When late, late by
Average across delayed arrivals
2 min
Delay per flight
Averaged over every flight flown
What the record says about this route
Flights from Ontario to Salt Lake City are among the most dependable in the record. A route this punctual is usually a short hop between airports with slots to spare.
This route does better than its own airport. Departures from ONT overall run 22.8 points less punctual than this particular one — so whatever congestion ONT has, this route is largely escaping it.
Every airline on ONT to SLC
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Delta Air Lines | 83 | 96.39% | 0% | 33 min | — |
| SkyWest Airlines | 30 | 96.67% | 0% | 21 min | — |
The return leg
SLC to ONT Salt Lake City back to Ontario 92.04% on time AOther routes from Ontario
Common questions
Are flights from Ontario to Salt Lake City usually delayed?
96.46% of flights on the ONT to SLC route arrived within 15 minutes of schedule, so roughly 1 in every ten arrived late. That is better than the average route in this record.
How often are ONT to SLC flights cancelled?
0% of scheduled flights did not operate — about 1 in every thousand. That is in the normal range.
When ONT to SLC flights are late, how late are they?
About 30 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on ONT to SLC during March 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →