Flight number record

OO 5138

SkyWest Airlines · Chicago to Morgantown

Route: ORD → MGW
Departs: 21:13
Flights: 323
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5138, 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 5138 draws a D−. About one flight in three arrives at least 15 minutes late, and the typical late arrival is close to two hours behind schedule. Build slack into anything you connect to. That rests on 323 flights, with a median arrival right on schedule.

The national on-time rate over the same period is 77.6%, so OO 5138 runs 13 points behind the country as a whole. Across a thousand flights that is about 128 extra late arrivals.

On time

64.8%

Arrivals under 15 minutes late, of 293 completed flights

Avg delay

121 min

Across delayed arrivals only, not all flights

Cancelled

6.50%

National rate is 1.81%

1 hour+ late

19.5%

National rate is 8.1%

These figures cover 323 flights between July 2025 and June 2026. Beyond the headline rate, 19.5% 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 5138 flies

OO 5138 flies ORD to MGW without a single fixed slot. Its most common scheduled departure was 21:13, used on 46 of 323 flights, with 11:45 (45 flights) and 16:20 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 21:1346 flights14.2%
Departs 11:4545 flights13.9%
Departs 16:2041 flights12.7%

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 21:13 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and OO 5138 runs 6 points worse at 64.8%. 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 5138 next to ORD to MGW

Every carrier on ORD to MGW combined arrived on time 65.7% of the time across 338 flights, so OO 5138 is about level with it. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 14 points.

OO 5138 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5138thin sample	323	64.8%	121 min	6.50%	D−
All SkyWest Airlines on ORD–MGWthin sample	338	65.7%	119 min	6.51%	C−
All carriers on ORD–MGWthin sample	338	65.7%	119 min	6.51%	C−
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 5138 quarter by quarter

Quarter by quarter OO 5138 held fairly steady: 59.8% in Jul–Sep 2025, 67.5% in Oct–Dec 2025, 67.1% in Jan–Mar 2026 and 66.0% in Apr–Jun 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights59.8%
Oct–Dec 202591 flights67.5%
Jan–Mar 202690 flights67.1%
Apr–Jun 202650 flights66.0%

Scale runs 50% to 75%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5138 did best on Tuesday at 74.4% on time and worst on Thursday at 60.0%. Each day rests on about 46 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 5138 runs late

One category carries most of the weight here. Carrier accounts for 50% of the 12,000 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
50%
Late-arriving aircraft
23%
National Airspace System
18%
Extreme weather
9%

The largest share of delay minutes, 50%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 6,205 of the 12,000 delay minutes reported here. The split is drawn from 12,438 delay minutes reported on OO 5138.

Cancellations run at 6.50%, 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 19.5% 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.

The same number turns up on one other city pair in the data, including MGW to ORD (15), but none flew often enough under OO 5138 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ORD to MGW only.

One caution: this is a thin sample. 323 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 5138

For a booking, the cancellation rate is the figure to plan around on OO 5138: 6.50% of its 323 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures