Flight number record

OO 4251

SkyWest Airlines · Sault Ste. Marie to Minneapolis

Route: CIU → MSP
Departs: 07:00
Flights: 352
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4251, 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 4251 lands a B−, level with the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about 2.5 hours on average. That is a workable record, not a spotless one. That rests on 352 flights, with a median arrival 11 minutes early.

On time

78.3%

Arrivals under 15 minutes late, of 332 completed flights

Avg delay

150 min

Across delayed arrivals only, not all flights

Cancelled

5.68%

National rate is 1.81%

1 hour+ late

14.2%

National rate is 8.1%

These figures cover 352 flights between July 2025 and June 2026. Beyond the headline rate, 14.2% 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 4251 flies

OO 4251 flies CIU to MSP without a single fixed slot. Its most common scheduled departure was 07:00, used on 132 of 352 flights, with 06:55 (90 flights) and 06:53 (57 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 07:00132 flights37.5%
Departs 06:5590 flights25.6%
Departs 06:5357 flights16.2%

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 07:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 4251 runs 11 points worse at 78.3%. 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 4251 next to CIU to MSP

Across its whole network SkyWest Airlines managed 79.0%, close to this flight's figure.

OO 4251 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4251thin sample	352	78.3%	150 min	5.68%	B−
All SkyWest Airlines on CIU–MSPthin sample	352	78.3%	150 min	5.68%	B−
All carriers on CIU–MSPthin sample	352	78.3%	150 min	5.68%	B−
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4251 quarter by quarter

Quarter by quarter OO 4251 held fairly steady: 81.5% in Jul–Sep 2025, 81.1% in Oct–Dec 2025, 73.0% in Jan–Mar 2026 and 76.3% in Apr–Jun 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights81.5%
Oct–Dec 202592 flights81.1%
Jan–Mar 202690 flights73.0%
Apr–Jun 202678 flights76.3%

Scale runs 65% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4251 did best on Wednesday at 87.8% on time and worst on Saturday at 68.8%. Each day rests on about 50 flights, so a gap of 19 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 4251 runs late

One category carries most of the weight here. Carrier accounts for 65% of the 11,000 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
65%
Extreme weather
32%
National Airspace System
3%
Security
0%

Extreme weather accounts for 32% 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 5.1 times the usual weather exposure. The split is drawn from 10,820 delay minutes reported on OO 4251.

Cancellations run at 5.68%, against 1.81% nationally. That is roughly one flight in twenty 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. 14.2% 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 352 flights under OO 4251 in the data flew CIU to MSP. 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. 352 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 4251

For a booking, the cancellation rate is the figure to plan around on OO 4251: 5.68% of its 352 scheduled flights did not operate. A late arrival costs about 2.5 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