Delta Air Lines SLC to STL on-time performance
Delta Air Lines nonstop flights from Salt Lake City to St. Louis · Aug 2025 – Jul 2026
On-time arrivals
84%
arrived < 15 min late
Cancelled
0.6%
6 flights
Avg arrival delay
10 min
62 min when late
Rank on route
#3 of 3
route average 85% on time
Key facts
- Delta Air Lines flights on SLC to STL arrived on time 84% of the time in Aug 2025 – Jul 2026.
- 0.6% were cancelled, and 6% arrived an hour or more late.
- That ranks #3 of 3 airlines on this route, which averaged 85% on time overall.
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (65%).
On-time trend by month
Why this airline's flights were late
- Airline (crew, maintenance, cleaning, fueling)65%
- Late-arriving aircraft25%
- Air traffic control & airport congestion9%
- Extreme weather1%
- Security0%
Other airlines on SLC to STL
- Southwest Airlines89% on time · 8 min avg delay
- SkyWest Airlines100% on time · 3 min avg delay
Full SLC to STL comparison →
Delta Air Lines on-time record across all routes →
979 Delta Air Lines flights tracked on this route; 6 cancelled, 3 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.