Flight number record
OO 3986
SkyWest Airlines · Detroit to Kalamazoo
- Route
- DTW → AZO
- Departs
- 10:05
- Flights
- 329
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 3986, 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 3986 lands a B, level with the national rate of 77.3%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by close to two hours on average. That rests on 329 flights, with a median arrival 10 minutes early.
Key figures
On time
77.4%
Arrivals under 15 minutes late, of 318 completed flights
Avg delay
112 min
Across delayed arrivals only, not all flights
Cancelled
2.74%
National rate is 1.89%
1 hour+ late
14.8%
National rate is 8.3%
These figures cover 329 flights between September 2025 and August 2026. Beyond the headline rate, 14.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 3986 flies
OO 3986 flies DTW to AZO without a single fixed slot. Its most common scheduled departure was 10:05, used on 98 of 329 flights, with 10:15 (62 flights) and 10:54 (55 flights) next.
- Departs 10:0598 flights29.8%
- Departs 10:1562 flights18.8%
- Departs 10:5455 flights16.7%
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 10:05 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 3986 runs 7 points worse at 77.4%. 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 3986 next to DTW to AZO
Every carrier on DTW to AZO combined arrived on time 75.2% of the time across 1,058 flights, so OO 3986 is 2 points ahead of it. 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 3986thin sample | 329 | 77.4% | 112 min | 2.74% | B |
| All SkyWest Airlines on DTW–AZO | 1,058 | 75.2% | 118 min | 2.46% | B |
| All carriers on DTW–AZO | 1,058 | 75.2% | 118 min | 2.46% | B |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 3986 quarter by quarter
OO 3986 did not run the same all year. Its best quarter was Oct–Dec 2025 at 92.9% on time and its weakest Jan–Mar 2026 at 57.3%, a swing of 36 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 202530 flights83.3%
- Oct–Dec 202560 flights92.9%
- Jan–Mar 202686 flights57.3%
- Apr–Jun 202691 flights84.4%
- Jul–Sep 202662 flights76.7%
Scale runs 50% to 100%.
By weekday, OO 3986 ranged from 73.3% on Tuesday to 83.0% on Sunday. With about 47 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 3986 runs when it is late
OO 3986 often beats the schedule: 109 of 318 completed flights, 34%, arrived 15 minutes or more early. When OO 3986 is late it tends to be very late: 47 of its 72 late arrivals were an hour or more behind, and 24 were two hours or more.
- 15+ min early109 flights34.3%
- Within 15 min137 flights43.1%
- 15–29 min late6 flights1.9%
- 30–59 min late19 flights6.0%
- 1–2 hours late23 flights7.2%
- 2+ hours late24 flights7.5%
Scale runs 0% to 100%.
Share of 318 completed flights by arrival against schedule.
12 of 78 late departures made up the time and arrived on time, 15% of them. Only 6 left on time and still arrived late.
The worst days
Worst days for OO 3986
The latest arrival of the period was on 16 August 2026, 6 hours 13 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 |
|---|---|---|
| 16 August 2026 | 6 hours 13 minutes | Extreme weather |
| 30 November 2025 | 5 hours 42 minutes | Carrier |
| 26 April 2026 | 4 hours 55 minutes | Carrier |
| 28 July 2026 | 4 hours 9 minutes | Carrier |
| 12 February 2026 | 4 hours 6 minutes | Carrier |
Delay causes
Why OO 3986 runs late
Carrier accounts for 71% of the 8,026 delay minutes carriers reported here, and the remaining four split what is left.
- 71%Carrier
- 26%Extreme weather
- 4%National Airspace System
Extreme weather accounts for 26% 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 4.3 times the usual weather exposure. The split is drawn from 8,026 delay minutes reported on OO 3986.
Cancellations run at 2.74%, against 1.89% nationally. That is roughly one flight in 40 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
14.8% 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 3986 is not only a DTW to AZO flight. It also flew AZO to DTW (329 flights, 76.8% 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. 329 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 |
|---|---|---|---|---|---|
| AZO to DTWthin sample | 329 | 76.8% | 123 min | 3.04% | B− |
What to do with this
Booking OO 3986
For a booking, the cancellation rate is the figure to plan around on OO 3986: 2.74% of its 329 scheduled flights did not operate. A late arrival costs close to two hours, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- DTW to AZO, every carrier and departure
- AZO to DTW, the return direction
- SkyWest Airlines 3909 on the same route77.2%
- 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
- What a cancellation rate actually tells you (and what it hides)
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.