Route
ONT → SLC
Ontario International Airport Salt Lake City International Airport
How punctual is this route?
- On-time arrivals
- 91.1%
- Less than 15 minutes late
- Cancelled
- 0.9%
- Of scheduled flights
- Average delay when late
- 92 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,239
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 58%
- Late-arriving aircraft 32%
- Extreme weather 5%
- Air traffic control & airport 4%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 90.9% | 110 |
| October 2025 | 93.9% | 115 |
| November 2025 | 91.8% | 88 |
| December 2025 | 85.6% | 90 |
| January 2026 | 86.7% | 92 |
| February 2026 | 88.8% | 89 |
| March 2026 | 87.8% | 94 |
| April 2026 | 91.8% | 99 |
| May 2026 | 96.5% | 115 |
| June 2026 | 96.5% | 113 |
| July 2026 | 90.5% | 116 |
| August 2026 | 89.7% | 118 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Delta Air Lines | 869 | 91.1% | 1.2% | 91 min |
| SkyWest Airlines | 340 | 91.4% | 0.3% | 103 min |
| Frontier Airlines | 30 | 86.7% | 0.0% | 45 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
DL2708
6% late · 365 flights
-
DL475
18% late · 122 flights
-
OO3757
8% late · 99 flights
-
DL3172
9% late · 86 flights
-
OO4443
12% late · 86 flights
-
DL1302
2% late · 67 flights
-
DL1786
12% late · 60 flights
-
DL1224
12% late · 49 flights
-
DL1896
14% late · 46 flights
-
OO3829
14% late · 36 flights
-
DL1006
3% late · 31 flights
-
OO3762
3% late · 31 flights
-
DL1345
11% late · 28 flights
-
F91122
17% late · 24 flights
-
OO3809
4% late · 24 flights
-
OO3974
0% late · 24 flights
-
OO3635
0% late · 23 flights
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