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Route Reliability

St. Louis → Kansas City

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

83
Pretty Reliable
WanderNerd Reliability Score
77%
Arrive within 15 minutes
8 min
Average arrival delay
0.3%
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 77% of the time across 1,020 flights. No comparison to make.

What the data says

Morning-you made the right choice.

STL–MCI flights departing between 6–9 AM arrived on time 97% of the time, versus 57% between 9 PM–12 AM.

Sunday scaries are real for this one.

STL–MCI flights arrived on time 83% of the time on Wednesdays and just 66% on Sundays. That gap is worth planning around.

It basically never cancels.

Out of 1,020 scheduled flights, only 0.3% were cancelled.

Flights on this route

The breakdown

On-time by weekday
  • Mon73%(153 flights)
  • Tue81%(148 flights)
  • Wed83%(145 flights)
  • Thu77%(150 flights)
  • Fri81%(150 flights)
  • Sat80%(116 flights)
  • Sun66%(154 flights)
On-time by departure window
  • 6–9 AM97%(103 flights)
  • 9 AM–12 PM89%(256 flights)
  • 12–3 PM88%(122 flights)
  • 3–6 PM70%(196 flights)
  • 6–9 PM70%(139 flights)
  • 9 PM–12 AM57%(200 flights)
On-time trend by month
74%
May

Jun 75% → May 74% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202575%89
July 202569%92
August 202580%91
September 202584%90
October 202578%88
November 202586%81
December 202561%84
January 202681%70
February 202683%71
March 202681%86
April 202673%86
May 202674%88

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.