Flight number record

OO 4243

SkyWest Airlines · Detroit to Escanaba

Route: DTW → ESC
Departs: 21:15
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4243, 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 4243 lands a B−, 6 points better than the national rate of 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about 3.0 hours on average. That is a workable record, not a spotless one. That rests on 365 flights, with a median arrival 16 minutes early.

Set against the rest of the country, OO 4243's record is 6 points better than the US average of 77.6%. That gap is worth roughly 56 fewer late arrivals for every thousand flights.

On time

83.2%

Arrivals under 15 minutes late, of 334 completed flights

Avg delay

180 min

Across delayed arrivals only, not all flights

Cancelled

6.85%

National rate is 1.81%

1 hour+ late

8.4%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. Beyond the headline rate, 8.4% 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 4243 flies

OO 4243 flies DTW to ESC without a single fixed slot. Its most common scheduled departure was 21:15, used on 237 of 365 flights, with 21:20 (50 flights) and 21:35 (38 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 21:15237 flights64.9%
Departs 21:2050 flights13.7%
Departs 21:3538 flights10.4%

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 21:15 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and OO 4243 runs 13 points better at 83.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

OO 4243 next to DTW to ESC

Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 4 points.

OO 4243 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4243	365	83.2%	180 min	6.85%	B−
All SkyWest Airlines on DTW–ESC	365	83.2%	180 min	6.85%	B−
All carriers on DTW–ESC	365	83.2%	180 min	6.85%	B−
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4243 quarter by quarter

OO 4243 did not run the same all year. Its best quarter was Jul–Sep 2025 at 90.1% on time and its weakest Jan–Mar 2026 at 72.0%, a swing of 18 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 flights90.1%
Oct–Dec 202592 flights83.5%
Jan–Mar 202690 flights72.0%
Apr–Jun 202691 flights85.5%

Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4243 did best on Saturday at 89.4% on time and worst on Sunday at 73.9%. Each day rests on about 52 flights, so a gap of 16 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 4243 runs late

One category carries most of the weight here. Carrier accounts for 63% of the 10,000 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
63%
Extreme weather
34%
National Airspace System
3%

Extreme weather accounts for 34% 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 5.4 times the usual weather exposure. The split is drawn from 10,062 delay minutes reported on OO 4243.

Cancellations run at 6.85%, against 1.81% nationally. That is about one flight in fifteen 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

8.4% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about 3.0 hours, which a normal layover absorbs.

Every one of the 365 flights under OO 4243 in the data flew DTW to ESC. 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 4243

For a booking, the cancellation rate is the figure to plan around on OO 4243: 6.85% of its 365 scheduled flights did not operate. A late arrival costs about 3.0 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures