Southwest Airlines SLC to STL on-time performance
Southwest Airlines nonstop flights from Salt Lake City to St. Louis · Aug 2025 – Jul 2026
On-time arrivals
89%
arrived < 15 min late
Cancelled
0.0%
0 flights
Avg arrival delay
8 min
54 min when late
Rank on route
#2 of 3
route average 85% on time
Key facts
- Southwest Airlines flights on SLC to STL arrived on time 89% of the time in Aug 2025 – Jul 2026.
- 0% were cancelled, and 0% arrived an hour or more late.
- That ranks #2 of 3 airlines on this route, which averaged 85% on time overall.
- The largest source of delay minutes was extreme weather (100%).
On-time trend by month
Why this airline's flights were late
- Extreme weather100%
- Airline (crew, maintenance, cleaning, fueling)0%
- Late-arriving aircraft0%
- Air traffic control & airport congestion0%
- Security0%
Other airlines on SLC to STL
- Delta Air Lines84% on time · 10 min avg delay
- SkyWest Airlines100% on time · 3 min avg delay
Full SLC to STL comparison →
Southwest Airlines on-time record across all routes →
9 Southwest Airlines flights tracked on this route; 0 cancelled, 0 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.