Southwest Airlines is the most reliable airline on the DSM to STL route with a 86% on-time rate. Based on 2,136 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: DSM to STL
Des Moines to St. Louis — airline reliability comparison
On-Time Rate by Airline
Southwest Airlines86%
DSM to STL Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Southwest AirlinesWNBest | 86% | 0.7% | 57m | 2,136 |
Route Overview
86%
Overall On-Time
57m
Avg Delay
0.7%
Cancel Rate
2,136
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.