Flight number record

OO 4242

SkyWest Airlines · Minneapolis to Sault Ste. Marie

Route: MSP → CIU
Departs: 12:45
Flights: 352
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4242, 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 4242 lands a B−, 2 points better than the national rate of 77.6%. About one flight in five 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 352 flights, with a median arrival 9 minutes early.

On time

79.5%

Arrivals under 15 minutes late, of 331 completed flights

Avg delay

92 min

Across delayed arrivals only, not all flights

Cancelled

3.69%

National rate is 1.81%

1 hour+ late

9.1%

National rate is 8.1%

These figures cover 352 flights between July 2025 and June 2026. Beyond the headline rate, 9.1% 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 4242 flies

OO 4242 flies MSP to CIU without a single fixed slot. Its most common scheduled departure was 12:45, used on 116 of 352 flights, with 12:50 (62 flights) and 10:10 (57 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 12:45116 flights33.0%
Departs 12:5062 flights17.6%
Departs 10:1057 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 12:45 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and OO 4242 runs level with that at 79.5%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 4242 next to MSP to CIU

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

OO 4242 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4242thin sample	352	79.5%	92 min	3.69%	B−
All SkyWest Airlines on MSP–CIUthin sample	352	79.5%	92 min	3.69%	B−
All carriers on MSP–CIUthin sample	352	79.5%	92 min	3.69%	B−
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4242 quarter by quarter

OO 4242 did not run the same all year. Its best quarter was Jul–Sep 2025 at 84.6% on time and its weakest Jan–Mar 2026 at 68.8%, a swing of 16 points on roughly 88 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 flights84.6%
Oct–Dec 202592 flights80.9%
Jan–Mar 202690 flights68.8%
Apr–Jun 202678 flights82.4%

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

By weekday, OO 4242 ranged from 75.5% on Sunday to 85.7% on Wednesday. With about 50 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why OO 4242 runs late

One category carries most of the weight here. Carrier accounts for 60% of the 6,252 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
60%
Extreme weather
35%
National Airspace System
5%
Security
0%

Extreme weather accounts for 35% 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 5.6 times the usual weather exposure. The split is drawn from 6,252 delay minutes reported on OO 4242.

Cancellations run at 3.69%, against 1.81% nationally. That is roughly 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 9.1% 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 4242 in the data flew MSP to CIU. 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 4242

For a booking, the cancellation rate is the figure to plan around on OO 4242: 3.69% of its 352 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