Flight number record

OO 4252

SkyWest Airlines · Alpena to Detroit

Route: APN → DTW
Departs: 17:45
Flights: 265
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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−, 5 points better than the national rate of 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about 2.4 hours on average. That is a workable record, not a spotless one. That rests on 265 flights, with a median arrival 18 minutes early.

Set against the rest of the country, OO 4252's record is 5 points better than the US average of 77.6%. That gap is worth roughly 45 fewer late arrivals for every thousand flights.

On time

82.1%

Arrivals under 15 minutes late, of 251 completed flights

Avg delay

144 min

Across delayed arrivals only, not all flights

Cancelled

5.28%

National rate is 1.81%

1 hour+ late

10.0%

National rate is 8.1%

These figures cover 265 flights between July 2025 and June 2026. Beyond the headline rate, 10.0% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

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 107 of 265 flights, with 17:54 (29 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 17:45107 flights40.4%
Departs 17:5429 flights10.9%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

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 68.2%, and OO 4252 runs 14 points better at 82.1%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

OO 4252 next to APN to DTW

Every carrier on APN to DTW combined arrived on time 83.1% of the time across 628 flights, so OO 4252 is about level with it. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 3 points.

OO 4252 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4252thin sample	265	82.1%	144 min	5.28%	B−
All SkyWest Airlines on APN–DTW	628	83.1%	133 min	5.10%	B−
All carriers on APN–DTW	628	83.1%	133 min	5.10%	B−
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4252 quarter by quarter

OO 4252 did not run the same all year. Its best quarter was Jul–Sep 2025 at 89.2% on time and its weakest Jan–Mar 2026 at 75.4%, a swing of 14 points on roughly 66 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.

Jul–Sep 202566 flights89.2%
Oct–Dec 202567 flights82.5%
Jan–Mar 202665 flights75.4%
Apr–Jun 202667 flights80.3%

Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4252 ranged from 77.6% on Thursday to 85.1% on Monday. With about 38 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why OO 4252 runs late

One category carries most of the weight here. Carrier accounts for 67% of the 6,486 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Carrier
67%
Extreme weather
28%
National Airspace System
5%

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 4.4 times the usual weather exposure. The split is drawn from 6,486 delay minutes reported on OO 4252.

Cancellations run at 5.28%, against 1.81% 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.0% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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 (181), 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. 265 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: 5.28% of its 265 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.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures