Best Time to Fly GRB to ORD: On-Time Stats by Hour & Airline
Green Bay Austin Straubel International → Chicago O'Hare International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 72.5% of Green Bay (GRB) to Chicago (ORD) flights arrived on time (2,698 scheduled flights). That is 5.1 points below the national average of 77.6%.
Among 3 airlines, Envoy Air led with 77.6% on time and SkyWest Airlines was last with 66.1%.
Over 24 months, Saturday was the most reliable day (78% on time) and December the worst month (63%).
The cancellation rate was 4.5% (US average 1.8%).
GRB to ORD 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 |
|---|---|---|---|---|
| Envoy Air | 77.6% | 71 min | 3.6% | 1,378 |
| Republic Airways | 74.8% | 59 min | 5.6% | 161 |
| SkyWest Airlines | 66.1% | 98 min | 5.3% | 1,159 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly GRB to ORD
On-time arrival % by scheduled departure hour (local time), 4,665 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 82.5% | 3.1% | 159 |
| 6am–7am | 83.3% | 1.8% | 995 |
| 7am–8am | 76.5% | 2.3% | 87 |
| 8am–9am | 76.2% | 1.1% | 349 |
| 9am–10am | 85.2% | 1.4% | 288 |
| 10am–11am | 79.4% | 2.4% | 657 |
| 11am–12pm | 80.8% | 0.5% | 214 |
| 12pm–1pm | 77.6% | 2.5% | 119 |
| 1pm–2pm | 70.2% | 4.0% | 298 |
| 2pm–3pm | 59.3% | 2.7% | 111 |
| 3pm–4pm | 69.4% | 4.5% | 425 |
| 4pm–5pm | 73.2% | 0.0% | 71 |
| 5pm–6pm | 50.4% | 3.0% | 524 |
| 6pm–7pm | 59.5% | 7.6% | 289 |
| 7pm–8pm | Limited data | 25 | |
| 8pm–9pm | 59.1% | 11.8% | 51 |
| 9pm–10pm | Limited data | 3 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on GRB to ORD
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) | 62.5% | -11.6 pts | 19.0% | 79 |
| Christmas & New Year (Dec 20 - Jan 3) | 65.4% | -8.7 pts | 4.2% | 142 |
| Summer peak (Jun 15 - Aug 15) | 74.5% | +0.4 pts | 1.3% | 910 |
| All other days | 74.1% | — | 3.0% | 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).