BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
DSM→STL

Des Moines, IA (DSM) to St. Louis, MO (STL) flight delay odds

89.3% of 460 official scheduled DSM-to-STL flights arrived on time; 6.1% arrived at least 30 minutes late and 0.7% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALLower disruption
89.3%arrived on time
6.1%30+ min late
0.7%cancelled
460scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late2.6%all scheduled flights
120+ minutes late1.5%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival-5.6 mincompleted flights

Which departure time was most reliable for DSM to STL?

Among qualifying DSM-to-STL departure window results, Early morning had the highest on-time rate: 94.6% of 242 flights. Evening was lowest at 76.9% across 121 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning24294.6%3.3%0.8%
Afternoon9791.8%5.2%0.0%
Evening12176.9%12.4%0.8%

Which weekday was most reliable for DSM to STL?

Among qualifying DSM-to-STL weekday results, Wednesday had the highest on-time rate: 97.2% of 72 flights. Saturday was lowest at 77.5% across 40 flights.

DayFlightsOn time30+ minCancelled
Monday7087.1%8.6%0.0%
Tuesday7295.8%2.8%0.0%
Wednesday7297.2%0.0%0.0%
Thursday6988.4%8.7%0.0%
Friday6891.2%2.9%0.0%
Saturday4077.5%17.5%2.5%
Sunday6982.6%7.2%2.9%

Which airline was most reliable for DSM to STL?

Only Southwest Airlines met the DSM-to-STL airline threshold: 89.3% of 460 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines46089.3%6.1%0.7%

Which month was most reliable for DSM to STL?

Among qualifying DSM-to-STL month results, July 2025 had the highest on-time rate: 94.7% of 57 flights. August 2025 was lowest at 82.1% across 56 flights.

MonthFlightsOn time30+ minCancelled
July 20255794.7%0.0%0.0%
August 20255682.1%14.3%0.0%
September 20255689.3%8.9%0.0%
October 20255794.7%1.8%0.0%
November 20255685.7%5.4%3.6%
December 20256085.0%10.0%1.7%
January 20265887.9%5.2%0.0%
February 20265294.2%3.8%0.0%

What drove DSM to STL delay minutes?

Late aircraft was the largest recorded DSM-to-STL delay category, accounting for 34.8% of 3,162 BTS-attributed delay minutes during July 2025–June 2026.

Airline23.7%
Late aircraft34.8%
National airspace23.7%
Weather17.4%
Security0.4%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.