St. Louis (STL) to Milwaukee (MKE): On-Time Performance
Data through July 2026
St. Louis (STL) to Milwaukee (MKE) effectively runs on two schedules. In September 2024, 93% of arrivals were on time; in January 2026 that fell to 72% — a 21-point seasonal swing. Across the full period the route averages 84% on-time against a national 78%. Morning departures also hold up better than evening ones (92% vs 76%), which matters most in the rough months.
- On-time
- 84%
- arrived <15 min late
- Avg delay
- 11 min
- completed flights
- Cancelled
- 0.9%
- Flights/day
- 1.9
- last 12 months
- Duration
- 1h 14m
- scheduled
- Distance
- 317 mi
Monthly on-time trend
Best time to fly from STL to MKE
Aim for departures around 8 a.m. (96% on-time); avoid 9 p.m. departures (71%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 81% | 14 min |
| Tuesday | 85% | 8 min |
| Wednesdaybest | 86% | 7 min |
| Thursday | 85% | 10 min |
| Friday | 86% | 13 min |
| Saturday | 86% | 7 min |
| Sunday | 82% | 14 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft67%
- Airline operations25%
- National airspace system6%
- Weather2%
Frequently asked questions
- How often are flights from STL to MKE delayed?
- 16% of STL–MKE 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 11 minutes.
- What is the best time of day to fly from STL to MKE?
- Departures around 8 a.m. have the best record (96% on-time), while departures around 9 p.m. have the worst (71%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from STL to MKE?
- The scheduled STL–MKE flight time averages 1h 14m over 317 miles. Actual arrival times vary — flights on this route land 15+ minutes late 16% of the time.
- How often are STL to MKE flights cancelled?
- 0.9% 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 STL to MKE?
- January 2026 was the roughest month in this dataset, with only 72% of arrivals on time. The best was September 2024 at 93%. If your dates are flexible, that 21-point gap is worth planning around.
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Based on 1,415 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.