St. Louis (STL) to Kansas City (MCI): On-Time Performance
Data through May 2026
When you fly STL to MCI matters as much as anything else about the booking: the route swung from 92% on-time in January 2025 to just 60% in December 2025. Across the full period the route averages 79% on-time against a national 78%. Morning departures also hold up better than evening ones (90% vs 66%), which matters most in the rough months.
- On-time
- 79%
- arrived <15 min late
- Avg delay
- 12 min
- completed flights
- Cancelled
- 0.6%
- Flights/day
- 2.8
- last 12 months
- Duration
- 1h 7m
- scheduled
- Distance
- 237 mi
Monthly on-time trend
Best time to fly from STL to MCI
Aim for departures around 8 a.m. (96% on-time); avoid 10 p.m. departures (58%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 76% | 16 min |
| Tuesday | 83% | 8 min |
| Wednesdaybest | 84% | 11 min |
| Thursday | 79% | 11 min |
| Friday | 82% | 12 min |
| Saturday | 77% | 12 min |
| Sunday | 70% | 16 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft66%
- Airline operations22%
- National airspace system8%
- Weather4%
Frequently asked questions
- How often are flights from STL to MCI delayed?
- 21% of STL–MCI 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 12 minutes.
- What is the best time of day to fly from STL to MCI?
- Departures around 8 a.m. have the best record (96% on-time), while departures around 10 p.m. have the worst (58%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from STL to MCI?
- The scheduled STL–MCI flight time averages 1h 7m over 237 miles. Actual arrival times vary — flights on this route land 15+ minutes late 21% of the time.
- How often are STL to MCI flights cancelled?
- 0.6% 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 STL to MCI?
- December 2025 was the roughest month in this dataset, with only 60% of arrivals on time. The best was January 2025 at 92%. If your dates are flexible, that 33-point gap is worth planning around.
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Based on 2,061 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.