Chicago (ORD) to Green Bay (GRB): On-Time Performance
Data through July 2026
When you fly ORD to GRB matters as much as anything else about the booking: the route swung from 88% on-time in April 2025 to just 51% in December 2025. Across the full period the route averages 72% on-time against a national 78%. Morning departures also hold up better than evening ones (81% vs 65%), which matters most in the rough months.
- On-time
- 72%
- arrived <15 min late
- Avg delay
- 22 min
- completed flights
- Cancelled
- 2.9%
- Flights/day
- 7.4
- last 12 months
- Duration
- 1h 12m
- scheduled
- Distance
- 173 mi
Best airline from ORD to GRB
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Republic Airwaysmost reliable | 82% | 18 min | 3.5% | 259 |
| Envoy Air | 76% | 16 min | 2.9% | 1,928 |
| SkyWest Airlines | 67% | 27 min | 2.9% | 2,548 |
Monthly on-time trend
Best time to fly from ORD to GRB
Aim for departures around 9 a.m. (86% on-time); avoid 9 p.m. departures (57%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 72% | 23 min |
| Tuesdaybest | 76% | 18 min |
| Wednesday | 72% | 22 min |
| Thursday | 70% | 21 min |
| Friday | 69% | 25 min |
| Saturday | 76% | 16 min |
| Sunday | 67% | 30 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft39%
- Airline operations32%
- National airspace system19%
- Weather11%
Frequently asked questions
- How often are flights from ORD to GRB delayed?
- 29% of ORD–GRB flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 22 minutes.
- Which airline is most reliable from ORD to GRB?
- Republic Airways has the best on-time record on this route at 82%, based on 259 flights. 3 airlines flew ORD–GRB frequently enough to compare in this period.
- What is the best time of day to fly from ORD to GRB?
- Departures around 9 a.m. have the best record (86% on-time), while departures around 9 p.m. have the worst (57%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ORD to GRB?
- The scheduled ORD–GRB flight time averages 1h 12m over 173 miles. Actual arrival times vary — flights on this route land 15+ minutes late 29% of the time.
- How often are ORD to GRB flights cancelled?
- 2.9% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, slightly above the national rate of 1.6%.
- What is the worst month to fly from ORD to GRB?
- December 2025 was the roughest month in this dataset, with only 51% of arrivals on time. The best was April 2025 at 88%. If your dates are flexible, that 37-point gap is worth planning around.
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Based on 4,735 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.