Carrier route record
DLGRB→DTW
Delta Air Lines · Green Bay to Detroit
- Flights
- 187
- 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 GRB to DTW lands a B, 4 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 187 flights, with a median arrival 20 minutes early.
Set against the rest of the country, Delta's GRB to DTW record is 4 points better than the US average of 77.3%. That gap is worth roughly 40 fewer late arrivals for every thousand flights.
Key figures
On time
81.3%
Arrivals under 15 minutes late, of 182 completed flights
Avg delay
77 min
Across delayed arrivals only, not all flights
Cancelled
1.60%
National rate is 1.89%
Whole route
82.4%
Every carrier on GRB to DTW, 924 flights
These figures cover 187 flights between September 2025 and August 2026. Beyond the headline rate, 8.2% 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 GRB to DTW
Delta flew 187 of the 924 flights on GRB to DTW, about 20% of it. Its 81.3% on time is about level with the route as a whole at 82.4%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from SkyWest at 82.7% to Delta at 81.3%.
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 | 82.7% | 116 min | 1.90% | B |
| Delta Air Lines (this page)thin sample | 187 | 81.3% | 77 min | 1.60% | B |
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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 187 flights.
There are not enough flights in each departure window to split Delta's GRB to DTW record by time of day without the percentages moving on noise. The headline rate of 81.3% is the reliable figure here.
Across the year
Delta on GRB to DTW through the year
- Jul–Sep 202522 flights—
- Oct–Dec 202577 flights85.5%
- Jan–Mar 202678 flights74.3%
- Apr–Jun 202610 flights—
Scale runs 65% to 90%. 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 81.3% on time across 187 flights.
Split by quarter, Delta on GRB to DTW logged 22 flights in Jul–Sep 2025, 77 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 81.3% annual figure is the one to use.
Arrival by arrival
How late Delta on GRB to DTW runs when it is late
Delta on GRB to DTW often beats the schedule: 103 of 182 completed flights, 57%, arrived 15 minutes or more early. The 34 late arrivals split 10 under half an hour, 9 between 30 and 60 minutes, and 15 an hour or more.
- 15+ min early103 flights56.6%
- Within 15 min45 flights24.7%
- 15–29 min late10 flights5.5%
- 30–59 min late9 flights4.9%
- 1–2 hours late7 flights3.8%
- 2+ hours late8 flights4.4%
Scale runs 0% to 100%.
Share of 182 completed flights by arrival against schedule.
A late pushback is often recovered here: of 42 departures that left 15 minutes late or more, 13 still arrived on time. 5 flights left on time and still arrived late.
The worst days
Worst days for Delta on GRB to DTW
The latest arrival of the period was on 9 January 2026, 5 hours 1 minute behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On four of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 9 January 2026 | 5 hours 1 minute | Carrier |
| 5 February 2026 | 3 hours 8 minutes | Late-arriving aircraft |
| 3 December 2025 | 3 hours 4 minutes | Late-arriving aircraft |
| 24 October 2025 | 3 hours 2 minutes | Late-arriving aircraft |
| 6 December 2025 | 2 hours 48 minutes | Late-arriving aircraft |
Delay causes
Why Delta runs late on this route
Late-arriving aircraft accounts for 76% of the 2,611 delay minutes carriers reported here, and the remaining four split what is left.
- 76%Late-arriving aircraft
- 14%Carrier
- 10%National Airspace System
- 0%Extreme weather
76% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,611 reported delay minutes here, that single category outweighs weather by 76 to one. The split is drawn from 2,611 reported delay minutes.
Cancellations sit at 1.60% against a national 1.89%, which is ordinary. Diversions add another 1.07%.
Connections and stage length
What a delay here costs
8.2% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.
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 5pm–8pm window matters as much as it does.
The return leg is a different operation and performs like one: it runs 67.8% on time across 186 flights, 14 points below 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. 187 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 GRB to DTW
Put together: treat all of this as provisional. 187 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 81.3% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 182 completed flights over 12 months sit behind that.
Related
Where to go next
- GRB to DTW, every carrier
- Delta on DTW to GRB, the return leg
- SkyWest Airlines on GRB to DTW82.7%
- Delta Air Lines network-wide record
- Detroit Metropolitan Wayne County (DTW) delay statistics
- Why the first flight of the morning is statistically safest
- Connecting flights: how much buffer the data says you need
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.