Flight number record

OO 3980

SkyWest Airlines · Kalamazoo to Detroit

Route: AZO → DTW
Departs: 05:30
Flights: 349
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about 2.6 hours on average. That is a workable record, not a spotless one. That rests on 349 flights, with a median arrival 9 minutes early.

Set against the rest of the country, OO 3980's record is 4 points better than the US average of 77.6%. That gap is worth roughly 43 fewer late arrivals for every thousand flights.

On time

81.9%

Arrivals under 15 minutes late, of 343 completed flights

Avg delay

158 min

Across delayed arrivals only, not all flights

Cancelled

1.72%

National rate is 1.81%

1 hour+ late

11.7%

National rate is 8.1%

These figures cover 349 flights between July 2025 and June 2026. Beyond the headline rate, 11.7% 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 3980 flies

OO 3980 flies AZO to DTW without a single fixed slot. Its most common scheduled departure was 05:30, used on 179 of 349 flights, with 05:25 (58 flights) and 05:35 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 05:30179 flights51.3%
Departs 05:2558 flights16.6%
Departs 05:3536 flights10.3%

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 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 7 points worse at 81.9%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

OO 3980 next to AZO to DTW

Every carrier on AZO to DTW combined arrived on time 76.8% of the time across 995 flights, so OO 3980 is 5 points ahead of it. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 3 points.

OO 3980 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3980thin sample	349	81.9%	158 min	1.72%	B
All SkyWest Airlines on AZO–DTW	995	76.8%	121 min	1.71%	B
All carriers on AZO–DTW	995	76.8%	121 min	1.71%	B
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	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 92.4% on time and its weakest Jan–Mar 2026 at 67.1%, a swing of 25 points on roughly 87 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 202592 flights92.4%
Oct–Dec 202580 flights79.7%
Jan–Mar 202686 flights67.1%
Apr–Jun 202691 flights86.7%

Scale runs 60% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 3980 ranged from 76.1% on Saturday to 88.0% on Thursday. With about 50 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why OO 3980 runs late

One category carries most of the weight here. Carrier accounts for 85% of the 9,763 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
85%
Extreme weather
12%
National Airspace System
3%

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 9,763 delay minutes reported on OO 3980.

Cancellations sit at 1.72% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

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. 11.7% 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 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, read OO 3980 as 81.9% on time with 1.72% cancelled over 349 flights. Those are rates from the past twelve months, not a forecast for any particular day.

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