Delta Air Lines STL to SLC on-time performance
Delta Air Lines nonstop flights from St. Louis to Salt Lake City · Aug 2025 – Jul 2026
On-time arrivals
88%
arrived < 15 min late
Cancelled
0.9%
9 flights
Avg arrival delay
14 min
104 min when late
Rank on route
#2 of 3
route average 87% on time
Key facts
- Delta Air Lines flights on STL to SLC arrived on time 88% of the time in Aug 2025 – Jul 2026.
- 0.9% were cancelled, and 5% arrived an hour or more late.
- That ranks #2 of 3 airlines on this route, which averaged 87% on time overall.
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (57%).
On-time trend by month
Why this airline's flights were late
- Airline (crew, maintenance, cleaning, fueling)57%
- Late-arriving aircraft26%
- Extreme weather9%
- Air traffic control & airport congestion7%
- Security0%
Other airlines on STL to SLC
- Southwest Airlines67% on time · 15 min avg delay
- SkyWest Airlines100% on time · 0 min avg delay
Full STL to SLC comparison →
Delta Air Lines on-time record across all routes →
979 Delta Air Lines flights tracked on this route; 9 cancelled, 2 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.