Best Time to Fly STL to MKE: On-Time Stats by Hour & Airline
St Louis Lambert International → General Mitchell International
Data through July 2026 · Last updated October 18, 2026
685 flights were scheduled from St. Louis (STL) to Milwaukee (MKE) in the last 12 months, and 82.3% of those that flew arrived on time, 4.7 points above the US average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Wednesday was the most reliable day (87% on time) and January the worst month (76%).
The cancellation rate was 0.7% (US average 1.8%).
STL to MKE on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlines | 82.3% | 62 min | 0.7% | 685 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly STL to MKE
On-time arrival % by scheduled departure hour (local time), 1,358 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | Limited data | 14 | |
| 8am–9am | 95.9% | 1.2% | 173 |
| 9am–10am | 92.1% | 1.2% | 166 |
| 10am–11am | 92.0% | 0.4% | 238 |
| 11am–12pm | 88.9% | 0.0% | 63 |
| 12pm–1pm | Limited data | 2 | |
| 1pm–2pm | 88.2% | 0.0% | 34 |
| 2pm–3pm | Limited data | 16 | |
| 3pm–4pm | Limited data | 12 | |
| 4pm–5pm | Limited data | 5 | |
| 5pm–6pm | Limited data | 1 | |
| 6pm–7pm | 85.0% | 2.4% | 42 |
| 7pm–8pm | 80.0% | 0.0% | 35 |
| 8pm–9pm | 81.2% | 0.8% | 242 |
| 9pm–10pm | 72.2% | 1.0% | 207 |
| 10pm–11pm | 72.0% | 0.9% | 108 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on STL to MKE
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 24 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 80.0% | -6.1 pts | 0.0% | 55 |
| Summer peak (Jun 15 - Aug 15) | 81.7% | -4.4 pts | 0.9% | 232 |
| All other days | 86.1% | — | 1.0% | 1,047 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).