Route
STL → DSM
St. Louis Lambert International Airport Des Moines International Airport
259 miles
Return route DSM → STL →
How punctual is this route?
- On-time arrivals
- 82.2%
- Less than 15 minutes late
- Cancelled
- 0.6%
- Of scheduled flights
- Average delay when late
- 48 min
- Flights arriving 15+ minutes late
- Flights tracked
- 347
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 61%
- Airline (crew, maintenance, cleaning) 23%
- Air traffic control & airport 11%
- Extreme weather 4%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Sep 2025
Mar 2026
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 89.1% | 56 |
| October 2025 | 91.2% | 57 |
| November 2025 | 83.3% | 56 |
| December 2025 | 66.7% | 60 |
| January 2026 | 80.7% | 58 |
| February 2026 | 88.5% | 52 |
| March 2026 | 50.0% | 8 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Southwest Airlines | 347 | 82.2% | 0.6% | 48 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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