Carrier route record
DLDTW→GRB
Delta Air Lines · Detroit to Green Bay
- Flights
- 186
- Period
- September 2025 to August 2026
- Share of route
- 20%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Delta Air Lines.
Delta on DTW to GRB draws a C. About one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 186 flights, with a median arrival 9 minutes early.
The national on-time rate over the same period is 77.3%, so Delta on DTW to GRB runs 10 points behind the country as a whole. Across a thousand flights that is about 95 extra late arrivals.
Key figures
On time
67.8%
Arrivals under 15 minutes late, of 183 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
1.61%
National rate is 1.89%
Whole route
73.9%
Every carrier on DTW to GRB, 923 flights
These figures cover 186 flights between September 2025 and August 2026. Beyond the headline rate, 9.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Delta against every carrier on DTW to GRB
Delta flew 186 of the 923 flights on DTW to GRB, about 20% of it. Its 67.8% on time is 6 points worse than the route as a whole, which runs 73.9%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from SkyWest at 75.5% to Delta at 67.8%.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SkyWest Airlines | 737 | 75.5% | 108 min | 2.04% | B |
| Delta Air Lines (this page)thin sample | 186 | 67.8% | 58 min | 1.61% | C |
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.
Departure window
When Delta 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 186 flights.
There are not enough flights in each departure window to split Delta's DTW to GRB record by time of day without the percentages moving on noise. The headline rate of 67.8% is the reliable figure here.
Across the year
Delta on DTW to GRB through the year
- Jul–Sep 202522 flights—
- Oct–Dec 202576 flights72.0%
- Jan–Mar 202678 flights63.2%
- Apr–Jun 202610 flights—
Scale runs 55% to 75%. 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 67.8% on time across 186 flights.
Split by quarter, Delta on DTW to GRB logged 22 flights in Jul–Sep 2025, 76 flights in Oct–Dec 2025, 78 flights in Jan–Mar 2026 and 10 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 67.8% annual figure is the one to use.
Arrival by arrival
How late Delta on DTW to GRB runs when it is late
Delta on DTW to GRB often beats the schedule: 66 of 183 completed flights, 36%, arrived 15 minutes or more early. The 59 late arrivals split 23 under half an hour, 19 between 30 and 60 minutes, and 17 an hour or more.
- 15+ min early66 flights36.1%
- Within 15 min58 flights31.7%
- 15–29 min late23 flights12.6%
- 30–59 min late19 flights10.4%
- 1–2 hours late9 flights4.9%
- 2+ hours late8 flights4.4%
Scale runs 0% to 100%.
Share of 183 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 56 departures that left 15 minutes late or more, only 5 made it up before arrival. 8 flights left on time and still arrived late.
The worst days
Worst days for Delta on DTW to GRB
The latest arrival of the period was on 24 October 2025, 3 hours 32 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 24 October 2025 | 3 hours 32 minutes | Carrier |
| 6 December 2025 | 3 hours 31 minutes | Carrier |
| 5 February 2026 | 3 hours 18 minutes | Carrier |
| 3 December 2025 | 3 hours 15 minutes | Carrier |
| 2 April 2026 | 2 hours 34 minutes | Carrier |
Delay causes
Why Delta runs late on this route
Carrier accounts for 63% of the 3,423 delay minutes carriers reported here, and the remaining four split what is left.
- 63%Carrier
- 27%Late-arriving aircraft
- 10%National Airspace System
- 0%Extreme weather
The largest share of delay minutes, 63%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,157 of the 3,423 delay minutes reported here. The split is drawn from 3,423 reported delay minutes.
Cancellations sit at 1.61% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and stage length
What a delay here costs
9.3% 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 287 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 81.3% on time across 187 flights, 14 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 14 points of difference.
One caution: this is a thin sample. 186 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 Delta on DTW to GRB
Put together: treat all of this as provisional. 186 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 67.8% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 183 completed flights over 12 months sit behind that.
Related
Where to go next
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.