Southwest Airlines MIA to STL on-time performance
Southwest Airlines nonstop flights from Miami to St. Louis · Aug 2025 – Jul 2026
On-time arrivals
69%
arrived < 15 min late
Cancelled
0.5%
2 flights
Avg arrival delay
17 min
53 min when late
Rank on route
#4 of 4
route average 74% on time
Key facts
- Southwest Airlines flights on MIA to STL arrived on time 69% of the time in Aug 2025 – Jul 2026.
- 0.5% were cancelled, and 11% arrived an hour or more late.
- That ranks #4 of 4 airlines on this route, which averaged 74% on time overall.
- The largest source of delay minutes was late-arriving aircraft (60%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft60%
- Airline (crew, maintenance, cleaning, fueling)19%
- Air traffic control & airport congestion18%
- Extreme weather2%
- Security1%
Other airlines on MIA to STL
- American Airlines74% on time · 20 min avg delay
- Envoy Air90% on time · 5 min avg delay
- Republic Airways75% on time · 55 min avg delay
Full MIA to STL comparison →
Southwest Airlines on-time record across all routes →
440 Southwest Airlines flights tracked on this route; 2 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.