Flight number record

OO 3687

SkyWest Airlines · Detroit to Lansing

Route: DTW → LAN
Departs: 10:00
Flights: 263
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 3687, 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 3687 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 close to two hours on average. That is a workable record, not a spotless one. That rests on 263 flights, with a median arrival 9 minutes early.

Set against the rest of the country, OO 3687's record is 5 points better than the US average of 77.6%. That gap is worth roughly 48 fewer late arrivals for every thousand flights.

On time

82.4%

Arrivals under 15 minutes late, of 261 completed flights

Avg delay

105 min

Across delayed arrivals only, not all flights

Cancelled

0.76%

National rate is 1.81%

1 hour+ late

11.5%

National rate is 8.1%

These figures cover 263 flights between July 2025 and June 2026. Beyond the headline rate, 11.5% 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 3687 flies

OO 3687 flies DTW to LAN without a single fixed slot. Its most common scheduled departure was 10:00, used on 68 of 263 flights, with 10:10 (50 flights) and 10:15 (39 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 10:0068 flights25.9%
Departs 10:1050 flights19.0%
Departs 10:1539 flights14.8%

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 10:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and OO 3687 runs level with that at 82.4%. 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 3687 next to DTW to LAN

Every carrier on DTW to LAN combined arrived on time 75.1% of the time across 881 flights, so OO 3687 is 7 points ahead of it. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 3 points.

OO 3687 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3687thin sample	263	82.4%	105 min	0.76%	B+
All SkyWest Airlines on DTW–LAN	881	75.1%	101 min	0.91%	B+
All carriers on DTW–LAN	881	75.1%	101 min	0.91%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 3687 quarter by quarter

OO 3687 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 64.7%, a swing of 28 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 202592 flights91.3%
Oct–Dec 202543 flights92.9%
Jan–Mar 202686 flights64.7%
Apr–Jun 202642 flights88.1%

Scale runs 55% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 3687 did best on Sunday at 91.7% on time and worst on Friday at 71.4%. Each day rests on about 38 flights, so a gap of 20 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 3687 runs late

One category carries most of the weight here. Carrier accounts for 83% of the 4,829 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
83%
Extreme weather
11%
National Airspace System
6%

Extreme weather accounts for 11% 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 1.8 times the usual weather exposure. The split is drawn from 4,829 delay minutes reported on OO 3687.

Cancellations are rare at 0.76%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

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. 11.5% 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.

OO 3687 is not only a DTW to LAN flight. It also flew LAN to DTW (257 flights, 79.2% 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. 263 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.

Other routes flown as OO 3687
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
LAN to DTWthin sample	257	79.2%	120 min	0.78%	B+

What to do with this

Booking OO 3687

For a booking, read OO 3687 as 82.4% on time with 0.76% cancelled over 263 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