Southwest Airlines is the most reliable airline on the STL to BWI route with a 83% on-time rate. Based on 4,588 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: STL to BWI
St. Louis to Baltimore — airline reliability comparison
On-Time Rate by Airline
Southwest Airlines83%
STL to BWI Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Southwest AirlinesWNBest | 83% | 1.3% | 54m | 4,588 |
Route Overview
82%
Overall On-Time
54m
Avg Delay
1.2%
Cancel Rate
4,588
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.