Flight number record
OO 4270
SkyWest Airlines · Minneapolis to Iron Mountain
- Route
- MSP → IMT
- Departs
- 15:15
- Flights
- 363
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4270, 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 4270 lands a B−, level with the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 363 flights, with a median arrival 12 minutes early.
Key figures
On time
76.7%
Arrivals under 15 minutes late, of 347 completed flights
Avg delay
92 min
Across delayed arrivals only, not all flights
Cancelled
3.86%
National rate is 1.89%
1 hour+ late
13.3%
National rate is 8.3%
These figures cover 363 flights between September 2025 and August 2026. Beyond the headline rate, 13.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 4270 flies
OO 4270 flies MSP to IMT without a single fixed slot. Its most common scheduled departure was 15:15, used on 182 of 363 flights, with 15:20 (81 flights) and 15:45 (38 flights) next.
- Departs 15:15182 flights50.1%
- Departs 15:2081 flights22.3%
- Departs 15:4538 flights10.5%
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 15:15 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and OO 4270 runs 5 points better at 76.7%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
OO 4270 next to MSP to IMT
Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4270thin sample | 363 | 76.7% | 92 min | 3.86% | B− |
| All SkyWest Airlines on MSP–IMTthin sample | 363 | 76.7% | 92 min | 3.86% | B− |
| All carriers on MSP–IMTthin sample | 363 | 76.7% | 92 min | 3.86% | B− |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4270 quarter by quarter
OO 4270 did not run the same all year. Its best quarter was Jul–Sep 2025 at 83.3% on time and its weakest Oct–Dec 2025 at 70.9%, a swing of 12 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 202590 flights70.9%
- Jan–Mar 202690 flights72.0%
- Apr–Jun 202691 flights80.9%
- Jul–Sep 202662 flights81.7%
Scale runs 60% to 90%.
By weekday, OO 4270 did best on Tuesday at 90.0% on time and worst on Friday at 66.7%. Each day rests on about 52 flights, so a gap of 23 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4270 runs when it is late
OO 4270 often beats the schedule: 149 of 347 completed flights, 43%, arrived 15 minutes or more early. When OO 4270 is late it tends to be very late: 46 of its 81 late arrivals were an hour or more behind, and 22 were two hours or more.
- 15+ min early149 flights42.9%
- Within 15 min117 flights33.7%
- 15–29 min late15 flights4.3%
- 30–59 min late20 flights5.8%
- 1–2 hours late24 flights6.9%
- 2+ hours late22 flights6.3%
Scale runs 0% to 100%.
Share of 347 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 84 departures that left 15 minutes late or more, only 10 made it up before arrival. 7 flights left on time and still arrived late.
The worst days
Worst days for OO 4270
The latest arrival of the period was on 7 June 2026, 5 hours 29 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 June 2026 | 5 hours 29 minutes | Carrier |
| 9 March 2026 | 5 hours 13 minutes | Carrier |
| 25 January 2026 | 5 hours | Carrier |
| 18 January 2026 | 4 hours 32 minutes | Extreme weather |
| 1 July 2026 | 4 hours 27 minutes | Carrier |
Delay causes
Why OO 4270 runs late
Carrier accounts for 69% of the 7,482 delay minutes carriers reported here, and the remaining four split what is left.
- 69%Carrier
- 19%Extreme weather
- 11%National Airspace System
- 1%Security
Extreme weather accounts for 19% 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 3.1 times the usual weather exposure. The split is drawn from 7,482 delay minutes reported on OO 4270.
Cancellations run at 3.86%, against 1.89% nationally. That is about one flight in 25 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
13.3% 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 363 flights under OO 4270 in the data flew MSP 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. 363 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 4270
For a booking, the cancellation rate is the figure to plan around on OO 4270: 3.86% of its 363 scheduled flights did not operate. A late arrival costs an hour and a half, 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
- 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.