Flight number record
OO 4290
SkyWest Airlines · Detroit to Iron Mountain
- Route
- DTW → IMT
- Departs
- 10:00
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4290, 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 4290 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.3%. The late ones land about 2.3 hours behind schedule. That rests on 365 flights, with a median arrival 6 minutes early.
The national on-time rate over the same period is 77.3%, so OO 4290 runs 6 points behind the country as a whole. Across a thousand flights that is about 63 extra late arrivals.
Key figures
On time
71.0%
Arrivals under 15 minutes late, of 352 completed flights
Avg delay
136 min
Across delayed arrivals only, not all flights
Cancelled
2.74%
National rate is 1.89%
1 hour+ late
18.5%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. Beyond the headline rate, 18.5% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 4290 flies
OO 4290 is scheduled to leave Detroit (DTW) at 10:00 local time and reach Iron Mountain (IMT) at 10:25. That slot held for 305 of the 365 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.
- Departs 10:00305 flights83.6%
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 10:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 4290 runs 13 points worse at 71.0%. 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 4290 next to DTW to IMT
Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4290 | 365 | 71.0% | 136 min | 2.74% | C |
| All SkyWest Airlines on DTW–IMT | 365 | 71.0% | 136 min | 2.74% | C |
| All carriers on DTW–IMT | 365 | 71.0% | 136 min | 2.74% | C |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4290 quarter by quarter
OO 4290 did not run the same all year. Its best quarter was Jul–Sep 2025 at 83.3% on time and its weakest Jan–Mar 2026 at 55.4%, a swing of 28 points on roughly 73 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 202592 flights68.2%
- Jan–Mar 202690 flights55.4%
- Apr–Jun 202691 flights76.4%
- Jul–Sep 202662 flights82.3%
Scale runs 45% to 90%.
By weekday, OO 4290 did best on Thursday at 78.4% on time and worst on Tuesday at 62.7%. Each day rests on about 52 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4290 runs when it is late
OO 4290 often beats the schedule: 103 of 352 completed flights, 29%, arrived 15 minutes or more early. When OO 4290 is late it tends to be very late: 65 of its 102 late arrivals were an hour or more behind, and 41 were two hours or more.
- 15+ min early103 flights29.3%
- Within 15 min147 flights41.8%
- 15–29 min late15 flights4.3%
- 30–59 min late22 flights6.3%
- 1–2 hours late24 flights6.8%
- 2+ hours late41 flights11.6%
Scale runs 0% to 100%.
Share of 352 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 88 departures that left 15 minutes late or more, only 5 made it up before arrival. In the other direction, 19 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at IMT.
The worst days
Worst days for OO 4290
The latest arrival of the period was on 19 January 2026, 10 hours 2 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 |
|---|---|---|
| 19 January 2026 | 10 hours 2 minutes | Extreme weather |
| 21 November 2025 | 9 hours 2 minutes | Carrier |
| 7 March 2026 | 8 hours 54 minutes | Carrier |
| 18 December 2025 | 6 hours 58 minutes | Carrier |
| 1 July 2026 | 6 hours 53 minutes | Carrier |
Delay causes
Why OO 4290 runs late
Carrier accounts for 70% of the 14,000 delay minutes carriers reported here, and the remaining four split what is left.
- 70%Carrier
- 27%Extreme weather
- 3%National Airspace System
- 0%Security
Extreme weather accounts for 27% 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 4.5 times the usual weather exposure. The split is drawn from 13,882 delay minutes reported on OO 4290.
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
18.5% 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.
Every one of the 365 flights under OO 4290 in the data flew DTW to IMT. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 365 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 4290
For a booking, the cancellation rate is the figure to plan around on OO 4290: 2.74% of its 365 scheduled flights did not operate. A late arrival costs about 2.3 hours, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- 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.