Kansas City (MCI) to St. Louis (STL): On-Time Performance
Data through July 2026
Kansas City (MCI) to St. Louis (STL) effectively runs on two schedules. In October 2024, 99% of arrivals were on time; in June 2026 that fell to 78% — a 21-point seasonal swing. Across the full period the route averages 87% on-time against a national 78%. Morning departures also hold up better than evening ones (94% vs 73%), which matters most in the rough months.
- On-time
- 87%
- 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
Best time to fly from MCI to STL
Aim for departures around 5 a.m. (97% on-time); avoid 5 p.m. departures (66%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 83% | 10 min |
| Tuesday | 90% | 5 min |
| Wednesday | 90% | 6 min |
| Thursday | 84% | 8 min |
| Fridaybest | 91% | 5 min |
| Saturday | 87% | 8 min |
| Sunday | 84% | 10 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft65%
- Airline operations22%
- National airspace system9%
- Weather4%
- Security1%
Frequently asked questions
- How often are flights from MCI to STL delayed?
- 13% of MCI–STL flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. 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 (97% on-time), while departures around 5 p.m. have the worst (66%). 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 13% of the time.
- How often are MCI to STL flights cancelled?
- 0.7% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from MCI to STL?
- June 2026 was the roughest month in this dataset, with only 78% of arrivals on time. The best was October 2024 at 99%. If your dates are flexible, that 21-point gap is worth planning around.
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Based on 2,135 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.