Flight number record
OO 3980
SkyWest Airlines · Kalamazoo to Detroit
- Route
- AZO → DTW
- Departs
- 05:30
- Flights
- 349
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 3980, 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 3980 lands a B−, 4 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 about 2.5 hours on average. That rests on 349 flights, with a median arrival 10 minutes early.
Key figures
On time
81.1%
Arrivals under 15 minutes late, of 338 completed flights
Avg delay
153 min
Across delayed arrivals only, not all flights
Cancelled
3.15%
National rate is 1.89%
1 hour+ late
11.5%
National rate is 8.3%
These figures cover 349 flights between September 2025 and August 2026. Beyond the headline rate, 11.5% 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.
Schedule
When OO 3980 flies
OO 3980 flies AZO to DTW without a single fixed slot. Its most common scheduled departure was 05:30, used on 140 of 349 flights, with 05:25 (63 flights) and 05:35 (36 flights) next.
- Departs 05:30140 flights40.1%
- Departs 05:2563 flights18.1%
- Departs 05:3536 flights10.3%
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 05:30 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 3980 runs 8 points worse at 81.1%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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.
Against the route
OO 3980 next to AZO to DTW
Every carrier on AZO to DTW combined arrived on time 77.2% of the time across 1,058 flights, so OO 3980 is 4 points ahead of it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 3980thin sample | 349 | 81.1% | 153 min | 3.15% | B− |
| All SkyWest Airlines on AZO–DTW | 1,058 | 77.2% | 125 min | 2.55% | B |
| All carriers on AZO–DTW | 1,058 | 77.2% | 125 min | 2.55% | B |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 3980 quarter by quarter
OO 3980 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Jan–Mar 2026 at 67.1%, a swing of 30 points on roughly 70 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 flights96.7%
- Oct–Dec 202580 flights79.7%
- Jan–Mar 202686 flights67.1%
- Apr–Jun 202691 flights86.7%
- Jul–Sep 202662 flights86.0%
Scale runs 60% to 100%.
By weekday, OO 3980 did best on Thursday at 87.8% on time and worst on Monday at 75.5%. Each day rests on about 50 flights, so a gap of 12 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 3980 runs when it is late
OO 3980 often beats the schedule: 118 of 338 completed flights, 35%, arrived 15 minutes or more early. When OO 3980 is late it tends to be very late: 39 of its 64 late arrivals were an hour or more behind, and 31 were two hours or more.
- 15+ min early118 flights34.9%
- Within 15 min156 flights46.2%
- 15–29 min late11 flights3.3%
- 30–59 min late14 flights4.1%
- 1–2 hours late8 flights2.4%
- 2+ hours late31 flights9.2%
Scale runs 0% to 100%.
Share of 338 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 54 departures that left 15 minutes late or more, only 0 made it up before arrival. 10 flights left on time and still arrived late.
The worst days
Worst days for OO 3980
The latest arrival of the period was on 30 November 2025, 12 hours 43 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 |
|---|---|---|
| 30 November 2025 | 12 hours 43 minutes | Carrier |
| 14 August 2026 | 10 hours 37 minutes | Extreme weather |
| 5 June 2026 | 9 hours 34 minutes | Carrier |
| 9 February 2026 | 7 hours 36 minutes | Carrier |
| 15 March 2026 | 6 hours 11 minutes | Carrier |
Delay causes
Why OO 3980 runs late
Carrier accounts for 76% of the 9,778 delay minutes carriers reported here, and the remaining four split what is left.
- 76%Carrier
- 21%Extreme weather
- 3%National Airspace System
Extreme weather accounts for 21% 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 3.6 times the usual weather exposure. The split is drawn from 9,778 delay minutes reported on OO 3980.
Cancellations run at 3.15%, against 1.89% nationally. That is about one flight in 30 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
11.5% 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 SJC to LAX (16), but none flew often enough under OO 3980 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to AZO to DTW only.
One caution: this is a thin sample. 349 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 3980
For a booking, the cancellation rate is the figure to plan around on OO 3980: 3.15% of its 349 scheduled flights did not operate. A late arrival costs about 2.5 hours, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- AZO to DTW, every carrier and departure
- DTW to AZO, the return direction
- SkyWest Airlines 3986 on the same route76.8%
- 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.