FlightRecord

Kansas City (MCI) to St. Louis (STL): On-Time Performance

Data through May 2026

Kansas City (MCI) to St. Louis (STL) effectively runs on two schedules. In October 2024, 99% of arrivals were on time; in May 2026 that fell to 81% — a 18-point seasonal swing. Across the full period the route averages 88% on-time against a national 78%. Morning departures also hold up better than evening ones (94% vs 75%), which matters most in the rough months.

On-time
88%
arrived <15 min late
Avg delay
7 min
completed flights
Cancelled
0.7%
Flights/day
2.8
last 12 months
Duration
1h 5m
scheduled
Distance
237 mi

Monthly on-time trend

Monthly on-time percentage for MCI to STL flights50%75%100%June 2024: 88% on-time (100 flights)88Jun 2024July 2024: 81% on-time (103 flights)81August 2024: 89% on-time (91 flights)89September 2024: 95% on-time (85 flights)95Sep 2024October 2024: 99% on-time (88 flights)99November 2024: 90% on-time (83 flights)90December 2024: 90% on-time (89 flights)90Dec 2024January 2025: 93% on-time (72 flights)93February 2025: 90% on-time (63 flights)90March 2025: 89% on-time (85 flights)89Mar 2025April 2025: 83% on-time (86 flights)83May 2025: 84% on-time (88 flights)84June 2025: 81% on-time (90 flights)81Jun 2025July 2025: 83% on-time (92 flights)83August 2025: 86% on-time (92 flights)86September 2025: 91% on-time (90 flights)91Sep 2025October 2025: 86% on-time (88 flights)86November 2025: 88% on-time (81 flights)88December 2025: 89% on-time (85 flights)89Dec 2025January 2026: 91% on-time (70 flights)91February 2026: 94% on-time (71 flights)94March 2026: 85% on-time (87 flights)85Mar 2026April 2026: 85% on-time (86 flights)85May 2026: 81% on-time (88 flights)81

Best time to fly from MCI to STL

Aim for departures around 5 a.m. (96% on-time); avoid 5 p.m. departures (67%).

On-time percentage by scheduled departure hour, MCI to STL5 a.m.: 96% on-time (277 flights)56 a.m.: 96% on-time (245 flights)67 a.m.: 95% on-time (79 flights)78 a.m.: 92% on-time (118 flights)810 a.m.: 87% on-time (72 flights)1011 a.m.: 93% on-time (234 flights)1112 p.m.: 92% on-time (123 flights)121 p.m.: 83% on-time (138 flights)132 p.m.: 84% on-time (25 flights)143 p.m.: 88% on-time (89 flights)154 p.m.: 85% on-time (182 flights)165 p.m.: 67% on-time (199 flights)176 p.m.: 80% on-time (263 flights)18scheduled departure hour

By day of week

DayOn-timeAvg delay
Monday83%9 min
Tuesdaybest92%4 min
Wednesdaybest92%6 min
Thursday84%8 min
Friday91%5 min
Saturday86%7 min
Sunday86%8 min

What causes delays on this route

Share of total delay minutes by cause, as reported by carriers to the US DOT.

  • Late-arriving aircraft64%
  • Airline operations22%
  • National airspace system10%
  • Weather4%

Frequently asked questions

How often are flights from MCI to STL delayed?
12% of MCI–STL flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 7 minutes.
What is the best time of day to fly from MCI to STL?
Departures around 5 a.m. have the best record (96% on-time), while departures around 5 p.m. have the worst (67%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
How long is the flight from MCI to STL?
The scheduled MCI–STL flight time averages 1h 5m over 237 miles. Actual arrival times vary — flights on this route land 15+ minutes late 12% of the time.
How often are MCI to STL flights cancelled?
0.7% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
What is the worst month to fly from MCI to STL?
May 2026 was the roughest month in this dataset, with only 81% of arrivals on time. The best was October 2024 at 99%. If your dates are flexible, that 18-point gap is worth planning around.

Explore related pages

More routes from MCI

Based on 2,053 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.