Best Time to Fly MKE to STL: On-Time Stats by Hour & Airline
General Mitchell International → St Louis Lambert International
Data through July 2026 · Last updated October 18, 2026
684 flights were scheduled from Milwaukee (MKE) to St. Louis (STL) in the last 12 months, and 88.8% of those that flew arrived on time, 11.1 points above the US average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Saturday was the most reliable day (93% on time) and December the worst month (80%).
The cancellation rate was 0.9% (US average 1.8%).
MKE to STL 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 | 88.8% | 56 min | 0.9% | 684 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly MKE to STL
On-time arrival % by scheduled departure hour (local time), 1,358 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 95.1% | 1.8% | 166 |
| 6am–7am | 96.3% | 0.4% | 245 |
| 7am–8am | 94.2% | 0.8% | 121 |
| 8am–9am | 98.4% | 0.8% | 124 |
| 9am–10am | Limited data | 16 | |
| 10am–11am | Limited data | 1 | |
| 11am–12pm | Limited data | 19 | |
| 12pm–1pm | Limited data | 1 | |
| 1pm–2pm | Limited data | 11 | |
| 2pm–3pm | Limited data | 24 | |
| 3pm–4pm | 88.5% | 0.0% | 104 |
| 4pm–5pm | 84.6% | 0.5% | 196 |
| 5pm–6pm | 76.3% | 0.6% | 172 |
| 6pm–7pm | 86.2% | 0.0% | 94 |
| 7pm–8pm | 84.4% | 0.0% | 32 |
| 8pm–9pm | 65.6% | 0.0% | 32 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on MKE to STL
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) | 87.3% | -2.8 pts | 0.0% | 55 |
| Summer peak (Jun 15 - Aug 15) | 85.3% | -4.7 pts | 0.0% | 232 |
| All other days | 90.1% | — | 0.7% | 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).