American Airlines STL to MIA on-time performance
American Airlines nonstop flights from St. Louis to Miami · Aug 2025 – Jul 2026
On-time arrivals
90%
arrived < 15 min late
Cancelled
1.0%
6 flights
Avg arrival delay
11 min
98 min when late
Rank on route
#1 of 4
route average 82% on time
Key facts
- American Airlines flights on STL to MIA arrived on time 90% of the time in Aug 2025 – Jul 2026.
- 1% were cancelled, and 5% arrived an hour or more late.
- That ranks #1 of 4 airlines on this route, which averaged 82% on time overall.
- The largest source of delay minutes was late-arriving aircraft (47%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft47%
- Airline (crew, maintenance, cleaning, fueling)33%
- Air traffic control & airport congestion10%
- Extreme weather9%
- Security0%
Other airlines on STL to MIA
- Southwest Airlines72% on time · 14 min avg delay
- Envoy Air83% on time · 9 min avg delay
- Republic Airways25% on time · 28 min avg delay
Full STL to MIA comparison →
American Airlines on-time record across all routes →
606 American Airlines flights tracked on this route; 6 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.