Flight number record
OO 4252
SkyWest Airlines · Alpena to Detroit
- Route
- APN → DTW
- Departs
- 17:45
- Flights
- 269
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4252, 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 4252 lands a B−, 4 points better than the national rate of 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by about 2.4 hours on average. That rests on 269 flights, with a median arrival 18 minutes early.
Set against the rest of the country, OO 4252's record is 4 points better than the US average of 77.3%. That gap is worth roughly 43 fewer late arrivals for every thousand flights.
Key figures
On time
81.6%
Arrivals under 15 minutes late, of 256 completed flights
Avg delay
145 min
Across delayed arrivals only, not all flights
Cancelled
4.83%
National rate is 1.89%
1 hour+ late
10.2%
National rate is 8.3%
These figures cover 269 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.
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Schedule
When OO 4252 flies
OO 4252 flies APN to DTW without a single fixed slot. Its most common scheduled departure was 17:45, used on 93 of 269 flights, with 17:50 (64 flights) next.
- Departs 17:4593 flights34.6%
- Departs 17:5064 flights23.8%
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 17:45 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and OO 4252 runs 14 points better at 81.6%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
OO 4252 next to APN to DTW
Every carrier on APN to DTW combined arrived on time 82.2% of the time across 632 flights, so OO 4252 is about level with it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4252thin sample | 269 | 81.6% | 145 min | 4.83% | B− |
| All SkyWest Airlines on APN–DTW | 632 | 82.2% | 127 min | 4.91% | B− |
| All carriers on APN–DTW | 632 | 82.2% | 127 min | 4.91% | B− |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4252 quarter by quarter
Quarter by quarter OO 4252 held fairly steady: 82.5% in Oct–Dec 2025, 75.4% in Jan–Mar 2026, 80.3% in Apr–Jun 2026 and 80.9% in Jul–Sep 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202523 flights—
- Oct–Dec 202567 flights82.5%
- Jan–Mar 202665 flights75.4%
- Apr–Jun 202667 flights80.3%
- Jul–Sep 202647 flights80.9%
Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, OO 4252 ranged from 77.6% on Friday to 87.2% on Sunday. With about 38 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 4252 runs when it is late
OO 4252 often beats the schedule: 150 of 256 completed flights, 59%, arrived 15 minutes or more early. When OO 4252 is late it tends to be very late: 26 of its 47 late arrivals were an hour or more behind, and 14 were two hours or more.
- 15+ min early150 flights58.6%
- Within 15 min59 flights23.0%
- 15–29 min late11 flights4.3%
- 30–59 min late10 flights3.9%
- 1–2 hours late12 flights4.7%
- 2+ hours late14 flights5.5%
Scale runs 0% to 100%.
Share of 256 completed flights by arrival against schedule.
6 of 48 late departures made up the time and arrived on time, 13% of them. Only 5 left on time and still arrived late.
The worst days
Worst days for OO 4252
The latest arrival of the period was on 10 January 2026, 19 hours 53 minutes behind schedule; most of its delay minutes were filed as extreme weather. On four of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 10 January 2026 | 19 hours 53 minutes | Extreme weather |
| 27 March 2026 | 17 hours 7 minutes | Carrier |
| 2 February 2026 | 16 hours 56 minutes | Carrier |
| 4 May 2026 | 4 hours 18 minutes | Carrier |
| 8 August 2026 | 4 hours 8 minutes | Carrier |
Delay causes
Why OO 4252 runs late
Carrier accounts for 67% of the 6,822 delay minutes carriers reported here, and the remaining four split what is left.
- 67%Carrier
- 28%Extreme weather
- 5%National Airspace System
Extreme weather accounts for 28% 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 4.7 times the usual weather exposure. The split is drawn from 6,822 delay minutes reported on OO 4252.
Cancellations run at 4.83%, against 1.89% nationally. That is about one flight in twenty cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight 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.
The same number turns up on one other city pair in the data, including DTW to APN (138), but none flew often enough under OO 4252 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to APN to DTW only.
One caution: this is a thin sample. 269 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 OO 4252
For a booking, the cancellation rate is the figure to plan around on OO 4252: 4.83% of its 269 scheduled flights did not operate. A late arrival costs about 2.4 hours, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- 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.