Flight number record
OO 4251
SkyWest Airlines · Sault Ste. Marie to Minneapolis
- Route
- CIU → MSP
- Departs
- 07:00
- Flights
- 344
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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−, 2 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about 2.5 hours on average. That rests on 344 flights, with a median arrival 12 minutes early.
Key figures
On time
79.3%
Arrivals under 15 minutes late, of 323 completed flights
Avg delay
153 min
Across delayed arrivals only, not all flights
Cancelled
6.10%
National rate is 1.89%
1 hour+ late
12.7%
National rate is 8.3%
These figures cover 344 flights between September 2025 and August 2026. Beyond the headline rate, 12.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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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 97 of 344 flights, with 06:55 (69 flights) and 06:53 (57 flights) next.
- Departs 07:0097 flights28.2%
- Departs 06:5569 flights20.1%
- Departs 06:5357 flights16.6%
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 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 10 points worse at 79.3%. 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 4251 next to CIU to MSP
Across its whole network SkyWest Airlines managed 78.7%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4251thin sample | 344 | 79.3% | 153 min | 6.10% | B− |
| All SkyWest Airlines on CIU–MSPthin sample | 344 | 79.3% | 153 min | 6.10% | B− |
| All carriers on CIU–MSPthin sample | 344 | 79.3% | 153 min | 6.10% | B− |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4251 quarter by quarter
OO 4251 did not run the same all year. Its best quarter was Jul–Sep 2025 at 86.7% on time and its weakest Jan–Mar 2026 at 73.0%, a swing of 14 points on roughly 69 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 flights86.7%
- Oct–Dec 202592 flights81.1%
- Jan–Mar 202690 flights73.0%
- Apr–Jun 202678 flights76.3%
- Jul–Sep 202654 flights84.9%
Scale runs 65% to 90%.
By weekday, OO 4251 did best on Wednesday at 91.8% on time and worst on Sunday at 71.4%. Each day rests on about 49 flights, so a gap of 20 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4251 runs when it is late
OO 4251 often beats the schedule: 151 of 323 completed flights, 47%, arrived 15 minutes or more early. When OO 4251 is late it tends to be very late: 41 of its 67 late arrivals were an hour or more behind, and 28 were two hours or more.
- 15+ min early151 flights46.7%
- Within 15 min105 flights32.5%
- 15–29 min late17 flights5.3%
- 30–59 min late9 flights2.8%
- 1–2 hours late13 flights4.0%
- 2+ hours late28 flights8.7%
Scale runs 0% to 100%.
Share of 323 completed flights by arrival against schedule.
11 of 69 late departures made up the time and arrived on time, 16% of them. 9 flights left on time and still arrived late.
The worst days
Worst days for OO 4251
The latest arrival of the period was on 22 February 2026, 13 hours 37 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in April 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 22 February 2026 | 13 hours 37 minutes | Carrier |
| 3 April 2026 | 9 hours 3 minutes | Extreme weather |
| 16 April 2026 | 8 hours 46 minutes | Extreme weather |
| 11 November 2025 | 8 hours 40 minutes | Carrier |
| 5 April 2026 | 8 hours 10 minutes | Extreme weather |
Delay causes
Why OO 4251 runs late
Carrier accounts for 61% of the 10,000 delay minutes carriers reported here, and the remaining four split what is left.
- 61%Carrier
- 36%Extreme weather
- 3%National Airspace System
- 0%Security
Extreme weather accounts for 36% 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 5.9 times the usual weather exposure. The split is drawn from 10,228 delay minutes reported on OO 4251.
Cancellations run at 6.10%, against 1.89% nationally. That is roughly one flight in fifteen 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
12.7% 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 344 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. 344 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: 6.10% of its 344 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.
Related
Where to go next
- Minneapolis-St Paul International (MSP) 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
- What a cancellation rate actually tells you (and what it hides)
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.