74% of flights leaving Green Bay (GRB) arrived on time over the past 12 months, 2 points worse than the national average of 76%. About 17 flights leave GRB on a typical day; 2.9% were cancelled. 78% pushed back from the gate on time, so a fair share of the lateness builds up after departure, on the taxiway or in the air.
At a glance
- Best hour to fly: 6 a.m. (86% on time). Worst: 5 p.m. (59%).
- Best month: October (84%). Worst: January (70%).
- Most reliable airline here: Delta Air Lines (82%), vs United Airlines at 65%.
- Biggest delay cause: late-arriving aircraft (34% of delay minutes).
- Year on year: getting worse (79% → 74%).
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for flights leaving GRB: when a flight was late, it was under 45 minutes late 46% of the time. About 1 in 10 flights landed an hour or more late, and 1 in 37 three hours or more; 2.9% were cancelled outright.
- On time or early74%
- 15–30 min late6.6%
- 30–60 min late6.1%
- 1–2 hours late5.2%
- 2–3 hours late2.3%
- 3+ hours late2.7%
- Diverted0.2%
- Cancelled2.9%
Share of all 6,258 scheduled flights, past 12 months, by arrival time against schedule.
Best time of day to fly out of GRB
Time of day matters more at GRB than almost anything else you control. Flights scheduled to leave at 6 a.m. arrived on time 86% of the time; at 5 p.m. it was 59%, a 27-point gap. Taken together, early departures (5–9 a.m.) ran 83% on time against 59% for the evening bank (5–10 p.m.). Early planes usually start the day at the airport, so they haven't had a chance to pick up delays elsewhere. By evening a late inbound aircraft, a crew running out of duty hours or an afternoon thunderstorm can push one late flight into the next. Cancellations cluster too: 3 p.m. departures were cancelled 5.1% of the time, against 2.9% overall.
Hour × month
Combine the two and the spread is wider still. The most reliable combination at GRB was a 7 a.m. departure in October (92% on time); the least, 6 p.m. in June (50%). If you can only move one thing, move the hour. Departure hour usually shifts the odds more than the month does.
Each cell: on-time rate for that departure hour in that calendar month, 2023–2026. Find your travel month, then look along the row for the greenest hour.
Best and worst months
January is the hardest month at GRB, with 70% of flights on time across 2023–2026; October is the best at 84%. Summer (June–August) runs 6 points worse than autumn: heavy schedules, peak loads and afternoon thunderstorms. Winter costs 9 points against autumn. Cancellations peak in March (4.2% of flights).
Airlines at GRB
Delta Air Lines runs 40% of departures from GRB. Among airlines with at least 1,000 departures here, Delta Air Lines was the most reliable (82% on time) and United Airlines the least (65%), a 18-point difference. On a route where both fly, that difference is worth more than a small fare gap.
| Airline | Departures | On time | Left on time | Cancelled | Typical arrival |
|---|---|---|---|---|---|
| Delta Air Lines | 2,518 | 82% | 82% | 1.5% | −14 min |
| United Airlines | 2,327 | 65% | 74% | 4.0% | 0 min |
| American Airlines | 1,413 | 74% | 79% | 3.7% | −8 min |
Why flights are late at GRB
Airlines report a cause for every flight that arrives 15 or more minutes late. At GRB, 34% of delay minutes came from late-arriving aircraft: the plane showed up late from its previous flight, so the delay started somewhere else. Next is the airlines themselves at 32%. That's why the first flight of the morning is the safest bet: it has no earlier flight to inherit a delay from. Of the 184 cancellations, 68% were blamed on weather.
The average taxi from gate to takeoff is 18 minutes, about typical for a large U.S. airport.
GRB vs nearby airports
| Airport | Distance | Departures | On time | Cancelled |
|---|---|---|---|---|
| GRB Austin Straubel | — | 6,258 | 74% | 2.9% |
| ATW Appleton | 25 mi | 9,142 | 74% | 2.6% |
Month by month
Over the latest 12 months 74% of GRB departures were on time, against 79% in the 12 months before, a decline of 5 points. The best recent month was July 2026 (83%); the worst, March 2026 (60%).
Worst cancellation days
The worst single day in the past year was Sunday, Mar 15, 2026, when 100% of 18 scheduled departures were cancelled. Days like that are usually a major storm, a system outage or a holiday peak hitting bad weather. No average predicts them, so on a stormy forecast, check your airline's travel waivers.
| Date | Departures | Cancelled | On time |
|---|---|---|---|
| Mar 15, 2026 | 18 | 100% | 0% |
| Mar 16, 2026 | 18 | 100% | 0% |
| Nov 29, 2025 | 19 | 53% | 32% |
| Nov 10, 2025 | 19 | 37% | 32% |
| Apr 2, 2026 | 19 | 32% | 5% |
| Mar 17, 2026 | 17 | 29% | 18% |
| Jun 11, 2026 | 17 | 29% | 47% |
| Jul 27, 2026 | 17 | 29% | 53% |
| Nov 30, 2025 | 21 | 29% | 5% |
| Mar 6, 2026 | 18 | 28% | 33% |
Last flights of the day
The last flight of the day is a different bet. Across routes from GRB, each airline's final departure was cancelled 3.4% of the time, against 2.9% for its earlier flights, about the same. 3.1% of last flights landed 3+ hours late. The riskiest last flight out was United Airlines to Chicago (5.5% cancelled).
| Last flight to | Airline | Leaves | Cancelled | 3h+ late | On time |
|---|---|---|---|---|---|
| ORD Chicago | United Airlines | 6:52 p.m. | 5.5% | 6.0% | 46% |
| ORD Chicago | American Airlines | 6:51 p.m. | 6.0% | 1.9% | 63% |
| MSP Minneapolis | Delta Air Lines | 4:14 p.m. | 0.8% | 2.7% | 73% |
| DTW Detroit | Delta Air Lines | 5:47 p.m. | 1.4% | 1.9% | 77% |
Each airline's last scheduled departure of the day on a route, on days it flies the route at least twice; past 12 months. Riskiest first.
Tips for flying out of GRB
- Book the earliest departure you can live with. At GRB the 6 a.m. flights do best.
- Traveling in January? Leave extra slack for anything that can't move: cruises, weddings, the last connection of the day.
- Choosing between airlines? Delta Air Lines has the better record here.
- Delayed already? Most delays at GRB come from late-arriving aircraft. If your inbound plane is late, your flight will be too, whatever the board says.
Routes from GRB
Least reliable first. Routes with at least 365 flights a year.
| To | Flights | On time | Cancelled | Typical arrival |
|---|---|---|---|---|
| ORD Chicago | 3,729 | 68% | 3.9% | −3 min |
| DTW Detroit | 1,092 | 82% | 1.7% | −14 min |
| MSP Minneapolis | 1,058 | 82% | 1.2% | −15 min |
| ATL Atlanta | 366 | 86% | 1.9% | −13 min |
Flights into GRB
Arriving rather than leaving? These are the routes into Austin Straubel, least reliable first. The weakest is from Chicago (67% on time).
| From | Flights | On time | Cancelled |
|---|---|---|---|
| ORD Chicago | 3,729 | 67% | 4.0% |
| DTW Detroit | 1,089 | 73% | 1.7% |
| ATL Atlanta | 366 | 74% | 1.9% |
| MSP Minneapolis | 1,059 | 78% | 1.3% |
Questions about GRB delays
What is the best time to fly out of GRB?
Flights scheduled at 6 a.m.: over the past year 86% of GRB departures at that hour arrived on time, against 59% at 5 p.m., the worst hour.
What month has the most flight delays at GRB?
January (70% on time). October is the best month (84%).
Which airline is most on time at GRB?
Delta Air Lines: 82% of its GRB departures arrived on time over the past year. United Airlines had the weakest record at 65%.
Why are flights delayed at GRB?
The biggest cause was late-arriving aircraft (34% of delay minutes): the plane showed up late from its previous flight, so the delay started somewhere else. Then the airlines themselves (32%).
How often are flights cancelled at GRB?
2.9% of scheduled departures over the past 12 months, peaking in March at 4.2%.
Hours are scheduled local departure times. "On time" means arriving less than 15 minutes late at the destination; cancelled and diverted flights count as not on time. Method.