Flight number record

OO 4290

SkyWest Airlines · Detroit to Iron Mountain

Route: DTW → IMT
Departs: 10:00
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 77.6%. 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 77.6%, so OO 4290 runs 6 points behind the country as a whole. Across a thousand flights that is about 58 extra late arrivals.

On time

71.8%

Arrivals under 15 minutes late, of 351 completed flights

Avg delay

140 min

Across delayed arrivals only, not all flights

Cancelled

2.74%

National rate is 1.81%

1 hour+ late

17.4%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. Beyond the headline rate, 17.4% 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 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%. 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 4290 runs 12 points worse at 71.8%. 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 4290 next to DTW to IMT

Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 7 points.

OO 4290 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4290	365	71.8%	140 min	2.74%	C
All SkyWest Airlines on DTW–IMT	365	71.8%	140 min	2.74%	C
All carriers on DTW–IMT	365	71.8%	140 min	2.74%	C
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	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 85.7% on time and its weakest Jan–Mar 2026 at 55.4%, a swing of 30 points on roughly 91 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 flights85.7%
Oct–Dec 202592 flights68.2%
Jan–Mar 202690 flights55.4%
Apr–Jun 202691 flights76.4%

Scale runs 45% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4290 did best on Thursday at 80.4% on time and worst on Tuesday at 63.5%. Each day rests on about 52 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 4290 runs late

One category carries most of the weight here. Carrier accounts for 71% of the 14,000 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
71%
Extreme weather
26%
National Airspace System
3%
Security
0%

Extreme weather accounts for 26% 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 4.1 times the usual weather exposure. The split is drawn from 13,819 delay minutes reported on OO 4290.

Cancellations run at 2.74%, against 1.81% 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 17.4% 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.

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.

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