Carrier route record
YXGRB→ORD
Republic Airways · Green Bay to Chicago
- 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 GRB to ORD sits in the middle of the pack with a B−. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 166 flights. The strongest carrier on the route with a full sample, Envoy Air, flew 1,375 at 75.1% on time.
The US average over the same twelve months is 77.6%, so there is little to separate Republic on GRB to ORD from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
75.6%
Arrivals under 15 minutes late, of 156 completed flights
Avg delay
59 min
Across delayed arrivals only, not all flights
Cancelled
5.42%
National rate is 1.81%
Whole route
71.1%
Every carrier on GRB to ORD, 2,776 flights
These figures cover 166 flights between July 2025 and June 2026. Beyond the headline rate, 9.0% 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 GRB to ORD
Republic flew 166 of the 2,776 flights on GRB to ORD, about 6% of it. Its 75.6% on time is 5 points better than the route as a whole, which runs 71.1%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from Republic at 75.6% to SkyWest at 66.0%.
The choice of carrier is not cosmetic here. Envoy Air arrives on time 75.1% of the time; SkyWest Airlines manages 66.0%. Sample sizes sit next to every figure, because a two-point gap across 1,235 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Republic Airways (this page)thin sample | 166 | 75.6% | 59 min | 5.42% | B− |
| Envoy Air | 1,375 | 75.1% | 69 min | 3.64% | B− |
| SkyWest Airlines | 1,235 | 66.0% | 99 min | 4.78% | C− |
SkyWest Airlines cancels 4.8% 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 is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 166 flights.
- 5am–8am16 flights—
- 8am–11am92 flights75.8%
- 11am–2pm2 flights—
- 2pm–5pm37 flights72.7%
- 5pm–8pm3 flights—
- 8pm–5am16 flights—
Scale runs 65% to 80%. Rows with fewer than 30 flights show a dash.
The 8am–11am window is the strongest at 75.8% on time. The full set of windows spans 3 points.
Across the year
Republic on GRB to ORD through the year
- Jul–Sep 20256 flights—
- Oct–Dec 2025111 flights78.3%
- Jan–Mar 20262 flights—
- Apr–Jun 202647 flights64.3%
Scale runs 55% to 85%. 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 75.6% on time across 166 flights.
Split by quarter, Republic on GRB to ORD logged 6 flights in Jul–Sep 2025, 111 flights in Oct–Dec 2025, 2 flights in Jan–Mar 2026 and 47 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 75.6% annual figure is the one to use.
Delay causes
Why Republic runs late on this route
One category carries most of the weight here. National Airspace System accounts for 61% of the 2,259 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.
- 61%National Airspace System
- 21%Late-arriving aircraft
- 18%Carrier
61% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,373 minutes out of 2,259, against a national NAS share of 21%. The split is drawn from 2,259 reported delay minutes.
Cancellations run at 5.42%, 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. 9.0% 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 79.1% on time across 166 flights, 4 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 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 GRB to ORD
Put together: the delay figures matter less here than the 5.42% cancellation rate. A late arrival costs you about an hour; 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. 156 completed flights over 12 months sit behind that.
Related
Where to go next
- GRB to ORD, every carrier
- Republic on ORD to GRB, the return leg
- Envoy Air on GRB to ORD75.1%
- SkyWest Airlines on GRB to ORD66.0%
- Republic Airways network-wide record
- Chicago O'Hare International (ORD) delay statistics
- The US routes with the most cancellations
- How often a connection fails at the major US hubs
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.