Carrier route record
OOGRB→DTW
SkyWest Airlines · Green Bay to Detroit
- Flights
- 737
- Period
- September 2025 to August 2026
- Share of route
- 80%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with SkyWest Airlines.
SkyWest on GRB to DTW lands a B, 5 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by close to two hours on average. That rests on 737 flights, with a median arrival 12 minutes early.
Set against the rest of the country, SkyWest's GRB to DTW record is 5 points better than the US average of 77.3%. That gap is worth roughly 54 fewer late arrivals for every thousand flights.
Key figures
On time
82.7%
Arrivals under 15 minutes late, of 723 completed flights
Avg delay
116 min
Across delayed arrivals only, not all flights
Cancelled
1.90%
National rate is 1.89%
Whole route
82.4%
Every carrier on GRB to DTW, 924 flights
These figures cover 737 flights between September 2025 and August 2026. Beyond the headline rate, 10.2% 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
SkyWest against every carrier on GRB to DTW
SkyWest flew 737 of the 924 flights on GRB to DTW, most of the route. Its 82.7% on time is about level with the route as a whole at 82.4%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from SkyWest at 82.7% to Delta at 81.3%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
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 (this page) | 737 | 82.7% | 116 min | 1.90% | B |
| Delta Air Linesthin sample | 187 | 81.3% | 77 min | 1.60% | B |
Flight by flight
SkyWest flight numbers on GRB to DTW
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 SkyWest 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 737 flights.
- 5am–8am327 flights88.2%
- 8am–11am—
- 11am–2pm327 flights79.0%
- 2pm–5pm11 flights—
- 5pm–8pm72 flights78.9%
- 8pm–5am—
Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 88.2% of the time, against 78.9% for the evening window. That is 9 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5am–8am window is the busiest, with 327 flights scheduled in it.
Across the year
SkyWest on GRB to DTW through the year
January is the weak month at 66.2% on time, against 97.1% in June. 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. May was the busiest month here, with 93 flights.
Across the week, Friday is the strongest day at 85.1% on time and Saturday the weakest at 78.3%, a spread of 7 points.
Arrival by arrival
How late SkyWest on GRB to DTW runs when it is late
SkyWest on GRB to DTW often beats the schedule: 332 of 723 completed flights, 46%, arrived 15 minutes or more early. When SkyWest on GRB to DTW is late it tends to be very late: 74 of its 125 late arrivals were an hour or more behind, and 42 were two hours or more.
- 15+ min early332 flights45.9%
- Within 15 min266 flights36.8%
- 15–29 min late26 flights3.6%
- 30–59 min late25 flights3.5%
- 1–2 hours late32 flights4.4%
- 2+ hours late42 flights5.8%
Scale runs 0% to 100%.
Share of 723 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 123 departures that left 15 minutes late or more, only 14 made it up before arrival. 16 flights left on time and still arrived late.
The worst days
Worst days for SkyWest on GRB to DTW
The latest arrival of the period was on 6 January 2026, 10 hours 42 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 |
|---|---|---|
| 6 January 2026 | 10 hours 42 minutes | Carrier |
| 14 December 2025 | 8 hours 38 minutes | Carrier |
| 2 July 2026 | 7 hours 14 minutes | Carrier |
| 15 December 2025 | 6 hours 52 minutes | Carrier |
| 17 March 2026 | 5 hours 56 minutes | Carrier |
Delay causes
Why SkyWest runs late on this route
Carrier accounts for 75% of the 15,000 delay minutes carriers reported here, and the remaining four split what is left.
- 75%Carrier
- 20%Extreme weather
- 5%National Airspace System
Extreme weather accounts for 20% 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 3.3 times the usual weather exposure. The split is drawn from 14,521 reported delay minutes.
The largest share of delay minutes, 75%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 11,000 of the 15,000 delay minutes reported here.
Cancellations sit at 1.90% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and stage length
What a delay here costs
10.2% 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 5am–8am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 75.5% on time across 737 flights, 7 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 7 points of difference.
One caution: this is a thin sample. 737 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 SkyWest on GRB to DTW
Put together: treat all of this as provisional. 737 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 82.7% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 723 completed flights over 12 months sit behind that.
Related
Where to go next
- GRB to DTW, every carrier
- SkyWest on DTW to GRB, the return leg
- Delta Air Lines on GRB to DTW81.3%
- SkyWest Airlines network-wide record
- Detroit Metropolitan Wayne County (DTW) delay statistics
- The best time of day to fly, according to 7.05 million flight records
- How often a connection fails at the major US hubs
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.