Flight number record

OO 4233

SkyWest Airlines · Minneapolis to Rhinelander

Route: MSP → RHI
Departs: 20:15
Flights: 365
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4233, 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 4233 earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 10 points better than the national rate of 77.3%. When something does go wrong the average delay runs close to two hours. That rests on 365 flights, with a median arrival 17 minutes early.

Set against the rest of the country, OO 4233's record is 10 points better than the US average of 77.3%. That gap is worth roughly 95 fewer late arrivals for every thousand flights.

On time

86.8%

Arrivals under 15 minutes late, of 355 completed flights

Avg delay

116 min

Across delayed arrivals only, not all flights

Cancelled

2.74%

National rate is 1.89%

1 hour+ late

6.2%

National rate is 8.3%

These figures cover 365 flights between September 2025 and August 2026. The median arrival is 17 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.

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Schedule

When OO 4233 flies

OO 4233 flies MSP to RHI without a single fixed slot. Its most common scheduled departure was 20:15, used on 209 of 365 flights, with 17:55 (153 flights) next.

Departs 20:15209 flights57.3%
Departs 17:55153 flights41.9%

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 20:15 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and OO 4233 runs 17 points better at 86.8%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

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Against the route

OO 4233 next to MSP to RHI

Every carrier on MSP to RHI combined arrived on time 87.2% of the time across 724 flights, so OO 4233 is about level with it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 8 points.

OO 4233 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4233	365	86.8%	116 min	2.74%	A
All SkyWest Airlines on MSP–RHI	724	87.2%	97 min	2.35%	A
All carriers on MSP–RHI	724	87.2%	97 min	2.35%	A
SkyWest Airlines, whole network	855,406	78.7%	88 min	1.79%	B

Across the year

OO 4233 quarter by quarter

OO 4233 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Oct–Dec 2025 at 84.4%, 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 flights96.7%
Oct–Dec 202592 flights84.4%
Jan–Mar 202690 flights84.5%
Apr–Jun 202691 flights85.4%
Jul–Sep 202662 flights90.3%

Scale runs 75% to 100%.

By weekday, OO 4233 did best on Saturday at 94.0% on time and worst on Sunday at 72.0%. Each day rests on about 52 flights, so a gap of 22 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late OO 4233 runs when it is late

OO 4233 often beats the schedule: 213 of 355 completed flights, 60%, arrived 15 minutes or more early. The 47 late arrivals split 12 under half an hour, 13 between 30 and 60 minutes, and 22 an hour or more.

15+ min early213 flights60.0%
Within 15 min95 flights26.8%
15–29 min late12 flights3.4%
30–59 min late13 flights3.7%
1–2 hours late12 flights3.4%
2+ hours late10 flights2.8%

Scale runs 0% to 100%.

Share of 355 completed flights by arrival against schedule.

5 of 41 late departures made up the time and arrived on time, 12% of them. 11 flights left on time and still arrived late.

The worst days

Worst days for OO 4233

The latest arrival of the period was on 7 December 2025, 12 hours 32 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.

The latest arrivals of OO 4233 in the period
Date	Arrived late by	Largest filed cause
7 December 2025	12 hours 32 minutes	Carrier
12 October 2025	12 hours 2 minutes	Carrier
27 March 2026	11 hours 54 minutes	Carrier
29 November 2025	4 hours 40 minutes	Extreme weather
18 February 2026	4 hours 4 minutes	Extreme weather

Delay causes

Why OO 4233 runs late

Carrier accounts for 78% of the 5,452 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
78%
Extreme weather
16%
National Airspace System
4%
Security
1%

Extreme weather accounts for 16% 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 2.7 times the usual weather exposure. The split is drawn from 5,452 delay minutes reported on OO 4233.

Cancellations run at 2.74%, against 1.89% nationally. That is roughly one flight in 40 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

6.2% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last close to two hours, which a normal layover absorbs.

Every one of the 365 flights under OO 4233 in the data flew MSP to RHI. 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. 365 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 4233

For a booking, the cancellation rate is the figure to plan around on OO 4233: 2.74% of its 365 scheduled flights did not operate. A late arrival costs close to two 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures