Carrier route record
OOGRB→ORD
SkyWest Airlines · Green Bay to Chicago
- Flights
- 1,235
- 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 GRB to ORD carries a cancellation problem, not just a delay problem: 4.8% of scheduled flights never operate, against 1.8% nationally. Of the ones that do fly, about two flights in three arrive on time, worth a C− overall. The punctuality figure counts only flights that actually departed, so it flatters an operation that cancels this often. That rests on 1,235 flights, with a median arrival 2 minutes late.
The national on-time rate over the same period is 77.6%, so SkyWest on GRB to ORD runs 12 points behind the country as a whole. Across a thousand flights that is about 116 extra late arrivals.
Key figures
On time
66.0%
Arrivals under 15 minutes late, of 1,173 completed flights
Avg delay
99 min
Across delayed arrivals only, not all flights
Cancelled
4.78%
National rate is 1.81%
Whole route
71.1%
Every carrier on GRB to ORD, 2,776 flights
These figures cover 1,235 flights between July 2025 and June 2026. Beyond the headline rate, 15.8% 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 GRB to ORD
SkyWest flew 1,235 of the 2,776 flights on GRB to ORD, about 44% of it. Its 66.0% on time is 5 points worse than the route as a whole, which runs 71.1%. Ranked by on-time rate it is last of three carriers on the route, where the range runs from Republic at 75.6% to SkyWest at 66.0%. 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 | 75.6% | 59 min | 5.42% | B− |
| Envoy Air | 1,375 | 75.1% | 69 min | 3.64% | B− |
| SkyWest Airlines (this page) | 1,235 | 66.0% | 99 min | 4.78% | C− |
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 38 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–8am254 flights85.0%
- 8am–11am365 flights72.4%
- 11am–2pm211 flights66.8%
- 2pm–5pm118 flights47.7%
- 5pm–8pm287 flights47.1%
- 8pm–5am—
Scale runs 40% to 90%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 47.1% on time, against 85.0% for the 5am–8am 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 8am–11am window is the busiest, with 365 flights scheduled in it.
Across the year
SkyWest on GRB to ORD through the year
December is the weak month at 56.9% on time, against 77.2% 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 152 flights.
Across the week, Monday is the strongest day at 72.4% on time and Friday the weakest at 61.6%. 11 points is a smaller lever than departure hour, but it is free.
Delay causes
Why SkyWest runs late on this route
One category carries most of the weight here. Late-arriving aircraft accounts for 44% of the 39,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 44%Late-arriving aircraft
- 24%Carrier
- 21%National Airspace System
- 11%Extreme weather
44% 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 4 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. The split is drawn from 39,301 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 85.0% on time here.
Cancellations run at 4.78%, 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. 15.8% 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 5am–8am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 61.2% on time across 1,234 flights, 5 points below 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 1,235 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 GRB to ORD
Put together: the delay figures matter less here than the 4.78% cancellation rate. A late arrival costs you an hour and a half; a cancelled flight costs you the day. Book the 5am–8am 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
- GRB to ORD, every carrier
- SkyWest on ORD to GRB, the return leg
- Republic Airways on GRB to ORD75.6%
- Envoy Air on GRB to ORD75.1%
- 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.