American Airlines is the most reliable airline on the STL to MIA route with a 88% on-time rate, compared to Southwest Airlines at 76%. Based on 1,705 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: STL to MIA
St. Louis to Miami — airline reliability comparison
On-Time Rate by Airline
American Airlines88%
76%
Southwest Airlines76%
STL to MIA Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| American AirlinesAABest | 88% | 0.8% | 92m | 1,705 |
| MQ | 76% | 0.4% | 54m | 359 |
| Southwest AirlinesWNWorst | 76% | 0.7% | 54m | 1,438 |
Route Overview
82%
Overall On-Time
67m
Avg Delay
0.9%
Cancel Rate
3,555
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.