Best Time to Fly ORD to MKE: On-Time Stats by Hour & Airline
Chicago O'Hare International → General Mitchell International
Data through July 2026 · Last updated October 18, 2026
5,268 flights were scheduled from Chicago (ORD) to Milwaukee (MKE) in the last 12 months, and 64.8% of those that flew arrived on time, 12.8 points below the US average of 77.6%.
Republic Airways was the most punctual of the 3 airlines on the route at 80.0%, while Envoy Air trailed at 63.7%.
September has been the best month (75% on time) and Friday the weakest day of the week (62%).
4.9% of flights were cancelled, versus 1.8% nationally.
ORD 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 |
|---|---|---|---|---|
| Republic Airways | 80.0% | 63 min | 7.1% | 113 |
| SkyWest Airlines | 64.5% | 91 min | 4.8% | 5,000 |
| Envoy Air | 63.7% | 67 min | 3.9% | 129 |
| PSA Airlines | Limited data | 26 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ORD to MKE
On-time arrival % by scheduled departure hour (local time), 8,642 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | Limited data | 2 | |
| 5am–6am | 71.0% | 0.0% | 31 |
| 6am–7am | 74.8% | 3.6% | 165 |
| 7am–8am | 81.6% | 17.4% | 46 |
| 8am–9am | 73.6% | 2.6% | 346 |
| 9am–10am | 77.2% | 2.3% | 473 |
| 10am–11am | 71.6% | 2.7% | 636 |
| 11am–12pm | 67.2% | 2.5% | 316 |
| 12pm–1pm | 71.7% | 3.6% | 466 |
| 1pm–2pm | 68.7% | 2.0% | 303 |
| 2pm–3pm | 72.5% | 1.9% | 649 |
| 3pm–4pm | 68.0% | 4.6% | 540 |
| 4pm–5pm | 58.1% | 3.8% | 632 |
| 5pm–6pm | 55.2% | 4.2% | 669 |
| 6pm–7pm | 63.3% | 2.6% | 664 |
| 7pm–8pm | 64.7% | 3.8% | 868 |
| 8pm–9pm | 66.9% | 3.4% | 717 |
| 9pm–10pm | 67.5% | 3.4% | 864 |
| 10pm–11pm | 54.8% | 7.9% | 228 |
| 11pm–12am | Limited data | 27 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ORD 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) | 51.2% | -17.3 pts | 16.8% | 155 |
| Christmas & New Year (Dec 20 - Jan 3) | 60.4% | -8.1 pts | 1.5% | 269 |
| Summer peak (Jun 15 - Aug 15) | 62.4% | -6.1 pts | 3.1% | 1,583 |
| All other days | 68.5% | — | 3.2% | 6,635 |
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).