Carrier route record
OOORD→GRB
SkyWest Airlines · Chicago to Green Bay
- Flights
- 1,234
- Period
- July 2025 to June 2026
- Share of route
- 44%
- Carriers
- 3
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with SkyWest Airlines.
SkyWest on ORD to GRB carries a cancellation problem, not just a delay problem: 4.9% of scheduled flights never operate, against 1.8% nationally. Of the ones that do fly, a little over half of flights arrive on time, worth a D− overall. The punctuality figure counts only flights that actually departed, so it flatters an operation that cancels this often. That rests on 1,234 flights, with a median arrival 4 minutes late.
The national on-time rate over the same period is 77.6%, so SkyWest on ORD to GRB runs 16 points behind the country as a whole. Across a thousand flights that is about 164 extra late arrivals.
Key figures
On time
61.2%
Arrivals under 15 minutes late, of 1,173 completed flights
Avg delay
85 min
Across delayed arrivals only, not all flights
Cancelled
4.86%
National rate is 1.81%
Whole route
68.8%
Every carrier on ORD to GRB, 2,775 flights
These figures cover 1,234 flights between July 2025 and June 2026. Beyond the headline rate, 16.9% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Carrier by carrier
SkyWest against every carrier on ORD to GRB
SkyWest flew 1,234 of the 2,775 flights on ORD to GRB, about 44% of it. Its 61.2% on time is 8 points worse than the route as a whole, which runs 68.8%. Ranked by on-time rate it is last of three carriers on the route, where the range runs from Republic at 79.1% to SkyWest at 61.2%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Republic Airwaysthin sample | 166 | 79.1% | 108 min | 4.82% | B− |
| Envoy Air | 1,375 | 74.3% | 66 min | 3.71% | C− |
| SkyWest Airlines (this page) | 1,234 | 61.2% | 85 min | 4.86% | D− |
Departure window
When SkyWest runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 30 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am—
- 8am–11am361 flights74.9%
- 11am–2pm165 flights63.5%
- 2pm–5pm373 flights57.7%
- 5pm–8pm182 flights44.6%
- 8pm–5am153 flights54.7%
Scale runs 35% to 80%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 44.6% on time, against 74.9% for the 8am–11am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 2pm–5pm window is the busiest, with 373 flights scheduled in it.
Across the year
SkyWest on ORD to GRB through the year
December is the weak month at 46.6% on time, against 81.3% in September. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. March was the busiest month here, with 153 flights.
Across the week, Saturday is the strongest day at 63.4% on time and Sunday the weakest at 58.7%. 5 points is a smaller lever than departure hour, but it is free.
Delay causes
Why SkyWest runs late on this route
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 39,000 reported delay minutes.
- 35%Late-arriving aircraft
- 33%Carrier
- 20%National Airspace System
- 12%Extreme weather
Extreme weather accounts for 12% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 1.9 times the usual weather exposure. The split is drawn from 38,813 reported delay minutes.
35% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 39,000 reported delay minutes here, that single category outweighs weather by 3 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit.
Cancellations run at 4.86%, against 1.81% nationally. That is about one flight in twenty cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and stage length
What a delay here costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 16.9% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
At 173 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 8am–11am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 66.0% on time across 1,235 flights, 5 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 5 points of difference.
The sample behind these figures is 1,234 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
What to do with this
Booking SkyWest on ORD to GRB
Put together: the delay figures matter less here than the 4.86% cancellation rate. A late arrival costs you an hour and a half; a cancelled flight costs you the day. Book the 8am–11am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 1,173 completed flights over 12 months sit behind that.
Related
Where to go next
- ORD to GRB, every carrier
- SkyWest on GRB to ORD, the return leg
- Republic Airways on ORD to GRB79.1%
- Envoy Air on ORD to GRB74.3%
- SkyWest Airlines network-wide record
- Chicago O'Hare International (ORD) delay statistics
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.