Flight number record
OO 4059
SkyWest Airlines · Detroit to Green Bay
- Route
- DTW → GRB
- Departs
- 10:00
- Flights
- 251
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4059, check with SkyWest Airlines. SkyWest Airlines flies under contract for larger airlines, so a ticket for this flight may show a different airline code and number.
OO 4059 lands a B, 3 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 close to two hours on average. That rests on 251 flights, with a median arrival 13 minutes early.
Key figures
On time
80.1%
Arrivals under 15 minutes late, of 246 completed flights
Avg delay
116 min
Across delayed arrivals only, not all flights
Cancelled
1.20%
National rate is 1.89%
1 hour+ late
11.4%
National rate is 8.3%
These figures cover 251 flights between September 2025 and August 2026. Beyond the headline rate, 11.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 4059 flies
OO 4059 flies DTW to GRB without a single fixed slot. Its most common scheduled departure was 10:00, used on 115 of 251 flights, with 10:05 (102 flights) and 10:10 (32 flights) next.
- Departs 10:00115 flights45.8%
- Departs 10:05102 flights40.6%
- Departs 10:1032 flights12.7%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 10:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 4059 runs 4 points worse at 80.1%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
OO 4059 next to DTW to GRB
Every carrier on DTW to GRB combined arrived on time 73.9% of the time across 923 flights, so OO 4059 is 6 points ahead of it. SkyWest flew 737 flights on the same city pair under all its flight numbers, including this one, and those ran 75.5% on time. Across its whole network SkyWest Airlines managed 78.7%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4059thin sample | 251 | 80.1% | 116 min | 1.20% | B |
| All SkyWest Airlines on DTW–GRB | 737 | 75.5% | 108 min | 2.04% | B |
| All carriers on DTW–GRB | 923 | 73.9% | 95 min | 1.95% | C |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4059 quarter by quarter
OO 4059 did not run the same all year. Its best quarter was Jul–Sep 2026 at 93.5% on time and its weakest Jan–Mar 2026 at 67.9%, a swing of 26 points on roughly 84 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Oct–Dec 202512 flights—
- Jan–Mar 202687 flights67.9%
- Apr–Jun 202690 flights85.4%
- Jul–Sep 202662 flights93.5%
Scale runs 60% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, OO 4059 did best on Sunday at 87.5% on time and worst on Wednesday at 66.7%. Each day rests on about 36 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4059 runs when it is late
OO 4059 often beats the schedule: 108 of 246 completed flights, 44%, arrived 15 minutes or more early. When OO 4059 is late it tends to be very late: 28 of its 49 late arrivals were an hour or more behind, and 16 were two hours or more.
- 15+ min early108 flights43.9%
- Within 15 min89 flights36.2%
- 15–29 min late9 flights3.7%
- 30–59 min late12 flights4.9%
- 1–2 hours late12 flights4.9%
- 2+ hours late16 flights6.5%
Scale runs 0% to 100%.
Share of 246 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 47 departures that left 15 minutes late or more, only 3 made it up before arrival. 5 flights left on time and still arrived late.
The worst days
Worst days for OO 4059
The latest arrival of the period was on 2 July 2026, 7 hours 39 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 2 July 2026 | 7 hours 39 minutes | Carrier |
| 17 March 2026 | 6 hours 16 minutes | Carrier |
| 29 December 2025 | 5 hours 40 minutes | Carrier |
| 23 February 2026 | 5 hours 14 minutes | Carrier |
| 2 April 2026 | 4 hours 33 minutes | Extreme weather |
Delay causes
Why OO 4059 runs late
Carrier accounts for 83% of the 5,665 delay minutes carriers reported here, and the remaining four split what is left.
- 83%Carrier
- 12%Extreme weather
- 5%National Airspace System
Extreme weather accounts for 12% 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 quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 1.9 times the usual weather exposure. The split is drawn from 5,665 delay minutes reported on OO 4059.
Cancellations sit at 1.20% against a national 1.89%, which is ordinary. Diversions add another 0.80%.
Connections and routes
What a delay on this flight costs
11.4% 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.
OO 4059 is not only a DTW to GRB flight. It also flew GRB to DTW (251 flights, 79.5% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
One caution: this is a thin sample. 251 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| GRB to DTWthin sample | 251 | 79.5% | 121 min | 0.80% | B+ |
What to do with this
Booking OO 4059
For a booking, read OO 4059 as 80.1% on time with 1.20% cancelled over 251 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DTW to GRB, every carrier and departure
- GRB to DTW, the return direction
- Detroit Metropolitan Wayne County (DTW) delay statistics
- SkyWest Airlines on-time record
- Every SkyWest Airlines flight number with a record
- The most and least reliable flight numbers in the US
- How often a connection fails at the major US hubs
A flight number here means SkyWest Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
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.