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Route Reliability

Kansas City → St. Louis

MCI–STL · 237 miles · Kansas City International Airport to St. Louis Lambert International Airport

92
Nerd Approved
WanderNerd Reliability Score
87%
Arrive within 15 minutes
2 min early
Average arrival delay
0.5%
Cancelled
1,020
Flights in the data

Data through May 2026.

Southwest Airlines is the only airline in this data on this route, arriving on time 87% of the time across 1,020 flights. No comparison to make.

What the data says

Morning-you made the right choice.

MCI–STL flights departing between 3–6 AM arrived on time 96% of the time, versus 75% between 6–9 PM.

Skip Thursday if you can.

MCI–STL flights arrived on time 93% of the time on Wednesdays. On Thursdays: 80%.

Recent months have been rougher.

MCI–STL flights arrived on time 84% of the time over the last three months in the data, compared with 92% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon85%(150 flights)
  • Tue91%(147 flights)
  • Wed93%(145 flights)
  • Thu80%(150 flights)
  • Fri91%(151 flights)
  • Sat85%(116 flights)
  • Sun82%(155 flights)
On-time by departure window
  • 3–6 AM96%(138 flights)
  • 6–9 AM95%(218 flights)
  • 9 AM–12 PM92%(132 flights)
  • 12–3 PM85%(167 flights)
  • 3–6 PM78%(259 flights)
  • 6–9 PM75%(100 flights)
On-time trend by month
81%
May

Jun 83% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%89
July 202583%92
August 202586%92
September 202591%90
October 202586%88
November 202588%81
December 202589%84
January 202691%69
February 202696%71
March 202685%86
April 202685%86
May 202681%86

Keep nerding

Based on 1,020 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.