Route Reliability
St. Louis → Des Moines
STL–DSM · 259 miles · St. Louis Lambert International Airport to Des Moines International Airport
- 82%
- Arrive within 15 minutes
- 2 min
- Average arrival delay
- 0.4%
- Cancelled
- 516
- Flights in the data
Data through May 2026.
Southwest Airlines is the only airline in this data on this route, arriving on time 82% of the time across 516 flights. No comparison to make.
What the data says
Morning flights do better here.
STL–DSM flights departing between 9 AM–12 PM arrived on time 93% of the time, versus 70% between 9 PM–12 AM.
Saturday is the weak spot.
STL–DSM flights arrived on time 85% of the time on Wednesdays. On Saturdays: 72%.
Recent months have been rougher.
STL–DSM flights arrived on time 80% of the time over the last three months in the data, compared with 88% in the three months before that.
Flights on this route
The breakdown
- Mon85%(79 flights)
- Tue83%(80 flights)
- Wed85%(80 flights)
- Thu80%(76 flights)
- Fri83%(76 flights)
- Sat72%(43 flights)
- Sun80%(78 flights)
- 6–9 AM—(8 flights)
- 9 AM–12 PM93%(234 flights)
- 12–3 PM76%(33 flights)
- 6–9 PM73%(63 flights)
- 9 PM–12 AM70%(174 flights)
Jun 88% → Feb 90% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 88% | 56 |
| July 2025 | 72% | 57 |
| August 2025 | 79% | 56 |
| September 2025 | 89% | 55 |
| October 2025 | 91% | 57 |
| November 2025 | 83% | 54 |
| December 2025 | 68% | 60 |
| January 2026 | 81% | 57 |
| February 2026 | 90% | 52 |
Keep nerding
Based on 516 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.