Best Time to Fly ORD to GRB: On-Time Stats by Hour & Airline
Chicago O'Hare International → Green Bay Austin Straubel International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 70.5% of Chicago (ORD) to Green Bay (GRB) flights arrived on time (2,698 scheduled flights). That is 7.1 points below the national average of 77.6%.
Republic Airways was the most punctual of the 3 airlines on the route at 79.7%, while SkyWest Airlines trailed at 62.1%.
October has been the best month (86% on time) and Sunday the weakest day of the week (67%).
4.5% of flights were cancelled, versus 1.8% nationally.
ORD to GRB 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 | 79.7% | 108 min | 5.0% | 161 |
| Envoy Air | 76.5% | 67 min | 3.6% | 1,378 |
| SkyWest Airlines | 62.1% | 86 min | 5.3% | 1,159 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ORD to GRB
On-time arrival % by scheduled departure hour (local time), 4,667 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 81.9% | 2.4% | 807 |
| 9am–10am | 85.9% | 0.3% | 349 |
| 10am–11am | 84.7% | 5.3% | 132 |
| 11am–12pm | 68.9% | 1.4% | 285 |
| 12pm–1pm | 63.8% | 7.8% | 51 |
| 1pm–2pm | 70.3% | 2.1% | 420 |
| 2pm–3pm | 81.2% | 2.6% | 115 |
| 3pm–4pm | 65.6% | 2.9% | 629 |
| 4pm–5pm | 65.9% | 3.3% | 215 |
| 5pm–6pm | 63.0% | 2.7% | 409 |
| 6pm–7pm | 66.3% | 2.6% | 302 |
| 7pm–8pm | 66.1% | 2.4% | 124 |
| 8pm–9pm | 62.1% | 4.8% | 392 |
| 9pm–10pm | 57.1% | 2.8% | 36 |
| 10pm–11pm | 69.8% | 6.5% | 338 |
| 11pm–12am | 80.3% | 3.2% | 63 |
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 GRB
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) | 60.0% | -13.2 pts | 17.7% | 79 |
| Christmas & New Year (Dec 20 - Jan 3) | 52.2% | -21.0 pts | 3.5% | 143 |
| Summer peak (Jun 15 - Aug 15) | 68.7% | -4.5 pts | 1.1% | 911 |
| All other days | 73.2% | — | 3.1% | 3,534 |
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).