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Route Reliability

Des Moines → St. Louis

DSM–STL · 259 miles · Des Moines International Airport to St. Louis Lambert International Airport

96
Nerd Approved
WanderNerd Reliability Score
90%
Arrive within 15 minutes
5 min early
Average arrival delay
0.6%
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 90% of the time across 516 flights. No comparison to make.

What the data says

Morning flights do better here.

DSM–STL flights departing between 6–9 AM arrived on time 96% of the time, versus 78% between 6–9 PM.

Saturday is the weak spot.

DSM–STL flights arrived on time 96% of the time on Tuesdays. On Saturdays: 81%.

Flights on this route

The breakdown

On-time by weekday
  • Mon86%(80 flights)
  • Tue96%(80 flights)
  • Wed96%(80 flights)
  • Thu87%(77 flights)
  • Fri93%(76 flights)
  • Sat81%(43 flights)
  • Sun86%(77 flights)
On-time by departure window
  • 3–6 AM96%(117 flights)
  • 6–9 AM96%(153 flights)
  • 3–6 PM87%(147 flights)
  • 6–9 PM78%(96 flights)
On-time trend by month
94%
Feb

Jun 88% → Feb 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202588%56
July 202595%57
August 202582%56
September 202589%56
October 202598%57
November 202589%54
December 202586%59
January 202688%58
February 202694%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.