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

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

79.8% of 460 official scheduled STL-to-DSM flights arrived on time; 11.5% arrived at least 30 minutes late and 0.4% 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 SIGNALGenerally reliable
79.8%arrived on time
11.5%30+ min late
0.4%cancelled
460scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late4.8%all scheduled flights
120+ minutes late0.7%all scheduled flights
Diverted0.4%did not reach as scheduled
Average arrival+1.9 mincompleted flights

Which departure time was most reliable for STL to DSM?

Among qualifying STL-to-DSM departure window results, Late morning had the highest on-time rate: 91.9% of 209 flights. Night was lowest at 67.3% across 153 flights.

Departure windowFlightsOn time30+ minCancelled
Late morning20991.9%5.7%0.5%
Evening6170.5%13.1%0.0%
Night15367.3%18.3%0.7%

Which weekday was most reliable for STL to DSM?

Among qualifying STL-to-DSM weekday results, Friday had the highest on-time rate: 83.8% of 68 flights. Saturday was lowest at 67.5% across 40 flights.

DayFlightsOn time30+ minCancelled
Monday7082.9%8.6%0.0%
Tuesday7280.6%12.5%0.0%
Wednesday7283.3%12.5%0.0%
Thursday6978.3%11.6%0.0%
Friday6883.8%7.4%0.0%
Saturday4067.5%17.5%2.5%
Sunday6976.8%13.0%1.4%

Which airline was most reliable for STL to DSM?

Only Southwest Airlines met the STL-to-DSM airline threshold: 79.8% of 460 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines46079.8%11.5%0.4%

Which month was most reliable for STL to DSM?

Among qualifying STL-to-DSM month results, October 2025 had the highest on-time rate: 91.2% of 57 flights. December 2025 was lowest at 66.7% across 60 flights.

MonthFlightsOn time30+ minCancelled
July 20255771.9%21.1%0.0%
August 20255678.6%14.3%0.0%
September 20255687.5%7.1%0.0%
October 20255791.2%5.3%0.0%
November 20255680.4%8.9%3.6%
December 20256066.7%18.3%0.0%
January 20265879.3%8.6%0.0%
February 20265288.5%3.8%0.0%

What drove STL to DSM delay minutes?

Late aircraft was the largest recorded STL-to-DSM delay category, accounting for 62.5% of 4,323 BTS-attributed delay minutes during July 2025–June 2026.

Airline24.4%
Late aircraft62.5%
National airspace10.7%
Weather2.4%
Security0.0%
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.