Route reliability record
ORD→GRB
Chicago to Green Bay
- Flights
- 2,724
- Period
- September 2025 to August 2026
- Distance
- 173 mi
- Carriers
- 3
This route carries a cancellation problem, not just a delay problem: 4.3% of scheduled flights never operate, against 1.9% nationally. Of the ones that do fly, about seven flights in ten 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 2,724 ORD to GRB flights, of which Envoy Air flew 1,389 at 75.7% on time.
Best time to fly ORD to GRB: a 8am–11am departure, ideally on a Saturday. Flights in that window arrived on time 79.8% of the time and Saturday flights 75.9%, against 70.2% for the route overall.
The national on-time rate over the same period is 77.3%, so this route runs 7 points behind the country as a whole. Across a thousand flights that is about 71 extra late arrivals.
Key figures
On time
70.2%
Arrivals under 15 minutes late, of 2,601 completed flights
Avg delay
81 min
Across delayed arrivals only, not all flights
Cancelled
4.33%
National rate is 1.89%
Best carrier
Envoy
75.7% on time across 1,389 flights
These figures cover 2,724 flights between September 2025 and August 2026. Beyond the headline rate, 12.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Carrier by carrier
Which airline is most reliable on ORD to GRB
The choice of carrier is not cosmetic here. Envoy Air arrives on time 75.7% of the time; SkyWest Airlines manages 62.4%. Sample sizes sit next to every figure, because a two-point gap across 1,175 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Republic Airwaysthin sample | 160 | 79.6% | 109 min | 5.00% | B− |
| Envoy Air | 1,389 | 75.7% | 66 min | 3.74% | B− |
| SkyWest Airlines | 1,175 | 62.4% | 90 min | 4.94% | 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.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Best ways to make this trip
The most reliable ways to fly Chicago to Green Bay
Every airline on this route and on the routes between nearby airports, ranked by how often a scheduled flight actually operated and arrived on time. 2 of the top 4 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. ORD → GRBChicago to Green Bay | Envoy Air | 72.9% | 75.7% | 3.74% | 8am–11am, Sat | — |
| 2. ORD → ATWChicago to Appleton | Envoy Air | 71.3% | 74.0% | 3.63% | 8am–11am, Tue | — |
| 3. ORD → ATWChicago to Appleton | SkyWest Airlines | 62.3% | 66.2% | 5.92% | 11am–2pm, Sat | — |
| 4. ORD → GRBChicago to Green Bay | SkyWest Airlines | 59.3% | 62.4% | 4.94% | 8am–11am, Sat | — |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 18 points, against 13 points between the best and worst carrier.
- 5am–8am—
- 8am–11am741 flights79.8%
- 11am–2pm368 flights77.1%
- 2pm–5pm520 flights61.4%
- 5pm–8pm529 flights61.5%
- 8pm–5am566 flights69.4%
Scale runs 55% to 85%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 79.8% of the time, against 61.4% for the afternoon window. That is 18 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 741 flights scheduled in it.
Explore
Filter ORD to GRB by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On ORD to GRB, the best departure window is 8am–11am at 79.8% on time and the worst is 2pm–5pm at 61.4%, a wide gap of 18.4 points. All US flights leaving 8am–11am ran 83.9%.
- 5–8am—
- 8–11am79.8%
- 11am–2pm77.1%
- 2–5pm61.4%
- 5–8pm61.5%
- 8pm–5am69.4%
best all US flightsScale 55% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 35 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
December is the weak month at 50.8% on time, against 85.4% in October. 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. April was the busiest month here, with 312 flights.
Across the week, Saturday is the strongest day at 75.9% on time and Sunday the weakest at 67.7%, a spread of 8 points.
Delay causes
Why this route gets delayed
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 62,000 reported delay minutes.
- 38%Late-arriving aircraft
- 28%Carrier
- 20%National Airspace System
- 15%Extreme weather
Extreme weather accounts for 15% 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 2.4 times the usual weather exposure. The split is drawn from 62,459 reported delay minutes.
38% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 62,000 reported delay minutes here, that single category outweighs weather by 3 to one.
Cancellations run at 4.33%, against 1.89% nationally. That is about one flight in 25 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 actually costs
12.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection 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 runs 72.0% on time across 2,723 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
The sample behind these figures is 2,724 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.
Work out the risk of missing a connection in GRB after this flight
What to do with this
Booking this route
Put together: the delay figures matter less here than the 4.33% cancellation rate. A late arrival costs you a little over 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. 2,601 completed flights over 12 months sit behind that.
Common questions
ORD to GRB questions
How often is ORD to GRB delayed?
Roughly one flight in three arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 29.8% of the 2,724 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
Which airline is most reliable on ORD to GRB?
Envoy Air leads at 75.7% on time across 1,389 flights. SkyWest Airlines is at the other end on 62.4%, a gap of 13 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on ORD to GRB?
The 8am–11am departure window is the strongest at 79.8% on time. The 2pm–5pm window is the weakest at 61.4%, 18 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are December delays on ORD to GRB?
December is the weakest month at 50.8% on time, compared with 85.4% in October. Across the year that is 35 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- GRB to ORD — the return legseparate record
- Chicago O'Hare International (ORD) delay statistics
- Republic Airways on ORD to GRB79.6%
- Envoy Air on ORD to GRB75.7%
- SkyWest Airlines on ORD to GRB62.4%
- ORD to LGA, a related route66.6%
- DTW to GRB, a related route73.9%
- ORD to BOS, a related route66.6%
- Republic Airways on-time record79.6%
- Envoy Air on-time record75.7%
- SkyWest Airlines on-time record62.4%
- The US routes with the most cancellations
- Same route, different airline: where the carrier you pick matters most
Direction matters. ORD to GRB and GRB to ORD are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
Embed ORD to GRB’s on-time badge on your site
Paste this into a web page. The badge shows the current on-time rate, cancellation rate and grade, and updates every month. Preview it, or build a badge for another route or airport.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.