Delta Air Lines ONT to SLC on-time performance
Delta Air Lines nonstop flights from Ontario to Salt Lake City · Aug 2025 – Jul 2026
On-time arrivals
92%
arrived < 15 min late
Cancelled
1.1%
10 flights
Avg arrival delay
7 min
82 min when late
Rank on route
#1 of 3
route average 92% on time
Key facts
- Delta Air Lines flights on ONT to SLC arrived on time 92% of the time in Aug 2025 – Jul 2026.
- 1.1% were cancelled, and 3% arrived an hour or more late.
- That ranks #1 of 3 airlines on this route, which averaged 92% on time overall.
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (50%).
On-time trend by month
Why this airline's flights were late
- Airline (crew, maintenance, cleaning, fueling)50%
- Late-arriving aircraft47%
- Air traffic control & airport congestion3%
- Extreme weather0%
- Security0%
Other airlines on ONT to SLC
- SkyWest Airlines91% on time · 9 min avg delay
- Frontier Airlines87% on time · 6 min avg delay
Full ONT to SLC comparison →
Delta Air Lines on-time record across all routes →
899 Delta Air Lines flights tracked on this route; 10 cancelled, 1 diverted.
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. How we calculate this.