Flight number record
OO 3684
SkyWest Airlines · Detroit to Lansing
- Route
- DTW → LAN
- Departs
- 22:55
- Flights
- 294
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 3684, 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 3684 sits in the middle of the pack with a B. Close to three flights in four arrive on time by the DOT's definition, about a point worse than the national rate of 77.3%. The late ones land close to two hours behind schedule. That rests on 294 flights, with a median arrival 5 minutes early.
Key figures
On time
75.9%
Arrivals under 15 minutes late, of 291 completed flights
Avg delay
103 min
Across delayed arrivals only, not all flights
Cancelled
1.02%
National rate is 1.89%
1 hour+ late
11.0%
National rate is 8.3%
These figures cover 294 flights between September 2025 and August 2026. Beyond the headline rate, 11.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 3684 flies
OO 3684 flies DTW to LAN without a single fixed slot. Its most common scheduled departure was 22:55, used on 84 of 294 flights, with 22:50 (56 flights) and 22:56 (48 flights) next.
- Departs 22:5584 flights28.6%
- Departs 22:5056 flights19.0%
- Departs 22:5648 flights16.3%
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 22:55 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and OO 3684 runs 6 points better at 75.9%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
OO 3684 next to DTW to LAN
Every carrier on DTW to LAN combined arrived on time 73.6% of the time across 833 flights, so OO 3684 is 2 points ahead of it. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 3684thin sample | 294 | 75.9% | 103 min | 1.02% | B |
| All SkyWest Airlines on DTW–LAN | 833 | 73.6% | 99 min | 0.84% | C+ |
| All carriers on DTW–LAN | 833 | 73.6% | 99 min | 0.84% | C+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 3684 quarter by quarter
OO 3684 did not run the same all year. Its best quarter was Jul–Sep 2025 at 90.0% on time and its weakest Jan–Mar 2026 at 61.4%, a swing of 29 points on roughly 59 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 flights90.0%
- Oct–Dec 202557 flights78.9%
- Jan–Mar 202686 flights61.4%
- Apr–Jun 202659 flights83.1%
- Jul–Sep 202662 flights79.0%
Scale runs 55% to 95%.
By weekday, OO 3684 did best on Monday at 86.4% on time and worst on Sunday at 63.4%. Each day rests on about 42 flights, so a gap of 23 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 3684 runs when it is late
The 70 late arrivals split 19 under half an hour, 19 between 30 and 60 minutes, and 32 an hour or more.
- 15+ min early62 flights21.3%
- Within 15 min159 flights54.6%
- 15–29 min late19 flights6.5%
- 30–59 min late19 flights6.5%
- 1–2 hours late14 flights4.8%
- 2+ hours late18 flights6.2%
Scale runs 0% to 100%.
Share of 291 completed flights by arrival against schedule.
14 of 74 late departures made up the time and arrived on time, 19% of them. 10 flights left on time and still arrived late.
The worst days
Worst days for OO 3684
The latest arrival of the period was on 3 March 2026, 11 hours 20 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 3 March 2026 | 11 hours 20 minutes | Carrier |
| 15 January 2026 | 10 hours 16 minutes | Carrier |
| 25 February 2026 | 10 hours 1 minute | Carrier |
| 30 June 2026 | 8 hours 29 minutes | Carrier |
| 7 December 2025 | 3 hours 54 minutes | Carrier |
Delay causes
Why OO 3684 runs late
Carrier accounts for 85% of the 7,182 delay minutes carriers reported here, and the remaining four split what is left.
- 85%Carrier
- 8%National Airspace System
- 7%Extreme weather
The largest share of delay minutes, 85%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 6,093 of the 7,182 delay minutes reported here. The split is drawn from 7,182 delay minutes reported on OO 3684.
Cancellations sit at 1.02% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
11.0% 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 four other city pairs in the data, including DTW to GRB (16), SLC to BOI (5) and BOI to SLC (5), but none flew often enough under OO 3684 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DTW to LAN only.
One caution: this is a thin sample. 294 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 3684
For a booking, read OO 3684 as 75.9% on time with 1.02% cancelled over 294 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DTW to LAN, every carrier and departure
- LAN to DTW, the return direction
- 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
- How often a connection fails at the major US hubs
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.