Southwest Airlines is the most reliable airline on the STL to DSM route with a 80% on-time rate. Based on 2,136 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: STL to DSM
St. Louis to Des Moines — airline reliability comparison
On-Time Rate by Airline
Southwest Airlines80%
STL to DSM Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Southwest AirlinesWNBest | 80% | 0.7% | 52m | 2,136 |
Route Overview
80%
Overall On-Time
52m
Avg Delay
0.7%
Cancel Rate
2,136
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.