Flight number record

OO 4270

SkyWest Airlines · Minneapolis to Iron Mountain

Route: MSP → IMT
Departs: 15:15
Flights: 363
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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−, about a point worse than the national rate of 77.6%. 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 is a workable record, not a spotless one. That rests on 363 flights, with a median arrival 12 minutes early.

On time

76.8%

Arrivals under 15 minutes late, of 349 completed flights

Avg delay

91 min

Across delayed arrivals only, not all flights

Cancelled

3.31%

National rate is 1.81%

1 hour+ late

12.6%

National rate is 8.1%

These figures cover 363 flights between July 2025 and June 2026. Beyond the headline rate, 12.6% 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 4270 flies

OO 4270 flies MSP to IMT without a single fixed slot. Its most common scheduled departure was 15:15, used on 209 of 363 flights, with 15:20 (83 flights) and 15:45 (38 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 15:15209 flights57.6%
Departs 15:2083 flights22.9%
Departs 15:4538 flights10.5%

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 15:15 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and OO 4270 runs 4 points better at 76.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 4270 next to MSP to IMT

Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 2 points.

OO 4270 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4270thin sample	363	76.8%	91 min	3.31%	B−
All SkyWest Airlines on MSP–IMTthin sample	363	76.8%	91 min	3.31%	B−
All carriers on MSP–IMTthin sample	363	76.8%	91 min	3.31%	B−
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	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 82.6% on time and its weakest Oct–Dec 2025 at 70.9%, a swing of 12 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 flights82.6%
Oct–Dec 202590 flights70.9%
Jan–Mar 202690 flights72.0%
Apr–Jun 202691 flights80.9%

Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4270 did best on Tuesday at 88.2% on time and worst on Friday at 66.7%. Each day rests on about 52 flights, so a gap of 22 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 4270 runs late

One category carries most of the weight here. Carrier accounts for 65% of the 7,386 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
22%
National Airspace System
12%

Extreme weather accounts for 22% 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 3.6 times the usual weather exposure. The split is drawn from 7,386 delay minutes reported on OO 4270.

Cancellations run at 3.31%, against 1.81% nationally. That is about one flight in 30 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. 12.6% 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 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: 3.31% 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.

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