82% of flights from Green Bay to Detroit arrived on time over the past 12 months. That is about the typical U.S. route. The 7 a.m. departures ran on time 86% of the time; the 5 p.m. ones 78%. 10% of flights arrived more than an hour late or not at all.
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for GRB → DTW: when a flight was late, it was under 45 minutes late 37% of the time. About 1 in 12 flights landed an hour or more late, and 1 in 36 three hours or more; 1.6% were cancelled outright.
- On time or early82%
- 15–30 min late3.6%
- 30–60 min late4.5%
- 1–2 hours late3.9%
- 2–3 hours late1.9%
- 3+ hours late2.7%
- Diverted0.2%
- Cancelled1.6%
Share of all 1,092 scheduled flights, past 12 months, by arrival time against schedule.
By airline
| Airline | Flights | On time | Cancelled | Typical arrival | 1h+ late | Avg when late | Operated by |
|---|---|---|---|---|---|---|---|
| Delta Air Lines | 1,092 | 82% | 1.7% | −14 min | 8.6% | +101 min | SkyWest 67%, Delta Air Lines 17%, Endeavor Air 15% |
Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.
Best time of day to fly
On-time rate by scheduled departure hour (local time at GRB). Delays build through the day as late planes knock on, so early flights usually do best.
Last flight of the day
On GRB → DTW, each airline's last flight of the day was cancelled 1.4% of the time, against 1.8% for its earlier flights, so here the last flight is actually the safer one. It arrived 3+ hours late 1.9% of the time (earlier flights: 3.3%). It matters more than the numbers suggest. Miss an earlier flight and there's another one that evening; miss the last one and you're usually waiting until morning.
| Airline | Last departure | Last: cancelled | Last: 3h+ late | Earlier: cancelled | Next morning |
|---|---|---|---|---|---|
| Delta Air Lines | 5:47 p.m. | 1.4% | 1.9% | 1.8% | first flight 6:55 a.m. |
Last flight = the airline's last scheduled departure on this route that day, on days it flies the route at least twice; past 12 months. Times are typical scheduled times over the latest three months.
By month
Each calendar month pooled over 2023–2026. Best: September (92%). Worst: January (72%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 161 | 80% | 4.3% |
| Tuesday | 156 | 85% | 1.3% |
| Wednesday | 154 | 82% | 0.7% |
| Thursday | 154 | 84% | 0.7% |
| Friday | 155 | 79% | 1.3% |
| Saturday | 156 | 81% | 0.6% |
| Sunday | 156 | 80% | 2.6% |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: weather 10 · air traffic/airport 6 · airline 2
Month by month
Not enough months with data to draw a trend.
Flight numbers on this route
Regular flights with at least 120 scheduled trips in the past year. Sorted by departure time.
| Flight | Departs | Flights | On time | Cancelled | Typical arrival | Operated by |
|---|---|---|---|---|---|---|
| DL 3984 | 7:00 a.m. | 239 | 88% | 0.8% | −14 min | SkyWest |
| DL 4059 | 11:07 a.m. | 251 | 79% | 0.8% | −14 min | SkyWest |
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Dec 1, 2025 | 3 | 0% | 2 |
| Jan 14, 2026 | 3 | 0% | 0 |
| Apr 2, 2026 | 3 | 0% | 0 |
| Mar 17, 2026 | 3 | 0% | 0 |
| Mar 16, 2026 | 3 | 0% | 3 |
Nearby airport alternatives
Other ways to make the same trip, using airports within 60 miles of Green Bay or Detroit. None has been clearly more reliable than GRB → DTW.
| Route | Flights | On time | Cancelled |
|---|---|---|---|
| GRB → DTW (this route) | 1,092 | 82% | 1.7% |
| ATW → DTW Appleton to Detroit Metro | 1,150 | 78% | 1.3% |
Questions
How often are flights from GRB to DTW on time?
82% of 1,092 scheduled flights from Green Bay, WI to Detroit, MI arrived within 15 minutes of schedule between September 2025 and August 2026. 1.7% were cancelled.
What is the best time of day to fly GRB to DTW?
Flights scheduled to leave at 7 a.m. were the most reliable (86% on time). The 5 p.m. departures were the least (78%).
What month has the most delays from GRB to DTW?
January (72% on time). The best month is September (92%), over 2023–2026.
Is the last flight of the day from GRB to DTW more likely to be cancelled?
No, the opposite. Each airline's last GRB–DTW flight of the day was cancelled 1.4% of the time over the past year, against 1.8% for its earlier flights. If the last flight is cancelled, the next one is usually the following morning.
Related
- DTW → GRB (return)
- Austin Straubel (GRB) delays by hour
- Flights into Detroit Metro (DTW)
- Delta Air Lines on-time record
- Connecting off this flight? Check the risk
Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.