Carrier route record
YXORD→GRB
Republic Airways · Chicago to Green Bay
- Flights
- 166
- Period
- July 2025 to June 2026
- Share of route
- 6%
- Carriers
- 3
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Republic Airways.
Republic on ORD to GRB lands a B−, 2 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by close to two hours on average. That is a workable record, not a spotless one. That rests on 166 flights. The strongest carrier on the route with a full sample, Envoy Air, flew 1,375 at 74.3% on time.
The US average over the same twelve months is 77.6%, so there is little to separate Republic on ORD to GRB from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
79.1%
Arrivals under 15 minutes late, of 158 completed flights
Avg delay
108 min
Across delayed arrivals only, not all flights
Cancelled
4.82%
National rate is 1.81%
Whole route
68.8%
Every carrier on ORD to GRB, 2,775 flights
These figures cover 166 flights between July 2025 and June 2026. Beyond the headline rate, 10.8% 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
Republic against every carrier on ORD to GRB
Republic flew 166 of the 2,775 flights on ORD to GRB, about 6% of it. Its 79.1% on time is 10 points better than the route as a whole, which runs 68.8%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from Republic at 79.1% to SkyWest at 61.2%.
The choice of carrier is not cosmetic here. Envoy Air arrives on time 74.3% of the time; SkyWest Airlines manages 61.2%. Sample sizes sit next to every figure, because a two-point gap across 1,234 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Republic Airways (this page)thin sample | 166 | 79.1% | 108 min | 4.82% | B− |
| Envoy Air | 1,375 | 74.3% | 66 min | 3.71% | C− |
| SkyWest Airlines | 1,234 | 61.2% | 85 min | 4.86% | D− |
SkyWest Airlines cancels 4.9% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.
Departure window
When Republic runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 12 points, against 13 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am—
- 8am–11am6 flights—
- 11am–2pm3 flights—
- 2pm–5pm39 flights86.8%
- 5pm–8pm62 flights76.3%
- 8pm–5am56 flights75.0%
Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.
The best window here is not the first bank but the 2pm–5pm slot at 86.8% on time, ahead of 8pm–5am at 75.0%. Where the curve peaks mid-day rather than at dawn, the constraint is usually congestion at one end rather than the aircraft's own rotation. The 5pm–8pm window is the busiest, with 62 flights scheduled in it.
Across the year
Republic on ORD to GRB through the year
- Jul–Sep 20256 flights—
- Oct–Dec 2025111 flights86.0%
- Jan–Mar 20263 flights—
- Apr–Jun 202646 flights64.3%
Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 79.1% on time across 166 flights.
Split by quarter, Republic on ORD to GRB logged 6 flights in Jul–Sep 2025, 111 flights in Oct–Dec 2025, 3 flights in Jan–Mar 2026 and 46 flights in Apr–Jun 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 79.1% annual figure is the one to use.
Delay causes
Why Republic 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 3,553 reported delay minutes.
- 42%Carrier
- 34%Late-arriving aircraft
- 16%National Airspace System
- 8%Extreme weather
34% 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 3,553 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 3,553 reported delay minutes.
The largest share of delay minutes, 42%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,475 of the 3,553 delay minutes reported here.
Cancellations run at 4.82%, 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. 10.8% 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 2pm–5pm window matters as much as it does.
The return leg is a different operation and performs like one: it runs 75.6% on time across 166 flights, 4 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 4 points of difference.
One caution: this is a thin sample. 166 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking Republic on ORD to GRB
Put together: the delay figures matter less here than the 4.82% cancellation rate. A late arrival costs you close to two hours; a cancelled flight costs you the day. Book the 2pm–5pm departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 158 completed flights over 12 months sit behind that.
Related
Where to go next
- ORD to GRB, every carrier
- Republic on GRB to ORD, the return leg
- Envoy Air on ORD to GRB74.3%
- SkyWest Airlines on ORD to GRB61.2%
- Republic Airways 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.