Flight number record

OO 4335

SkyWest Airlines · Detroit to Pellston

Route: DTW → PLN
Departs: 15:55
Flights: 318
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4335, 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 4335 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 318 flights, with a median arrival 10 minutes early.

On time

76.4%

Arrivals under 15 minutes late, of 275 completed flights

Avg delay

97 min

Across delayed arrivals only, not all flights

Cancelled

12.89%

National rate is 1.81%

1 hour+ late

13.5%

National rate is 8.1%

These figures cover 318 flights between July 2025 and June 2026. Beyond the headline rate, 13.5% 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 4335 flies

OO 4335 flies DTW to PLN without a single fixed slot. Its most common scheduled departure was 15:55, used on 222 of 318 flights, with 16:09 (35 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 15:55222 flights69.8%
Departs 16:0935 flights11.0%

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 15:55 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and OO 4335 runs 4 points better at 76.4%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 4335 next to DTW to PLN

Every carrier on DTW to PLN combined arrived on time 78.6% of the time across 660 flights, so OO 4335 is 2 points behind it. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 3 points.

OO 4335 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4335thin sample	318	76.4%	97 min	12.89%	B−
All SkyWest Airlines on DTW–PLN	660	78.6%	89 min	14.09%	B−
All carriers on DTW–PLN	660	78.6%	89 min	14.09%	B−
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4335 quarter by quarter

OO 4335 did not run the same all year. Its best quarter was Apr–Jun 2026 at 88.5% on time and its weakest Jan–Mar 2026 at 60.0%, a swing of 29 points on roughly 80 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 flights78.9%
Oct–Dec 202589 flights75.9%
Jan–Mar 202665 flights60.0%
Apr–Jun 202672 flights88.5%

Scale runs 50% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4335 ranged from 69.0% on Monday to 80.6% on Tuesday. With about 45 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why OO 4335 runs late

One category carries most of the weight here. Carrier accounts for 75% of the 6,303 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
75%
Extreme weather
16%
National Airspace System
9%

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 2.6 times the usual weather exposure. The split is drawn from 6,303 delay minutes reported on OO 4335.

Cancellations run at 12.89%, against 1.81% nationally. That is about one flight in eight 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. 13.5% 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.

OO 4335 is not only a DTW to PLN flight. It also flew PLN to DTW (318 flights, 80.1% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.

One caution: this is a thin sample. 318 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.

Other routes flown as OO 4335
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
PLN to DTWthin sample	318	80.1%	102 min	12.89%	B−

What to do with this

Booking OO 4335

For a booking, the cancellation rate is the figure to plan around on OO 4335: 12.89% of its 318 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