Flight number record
OO 5138
SkyWest Airlines · Chicago to Morgantown
- Route
- ORD → MGW
- Departs
- 11:45
- Flights
- 306
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 C−. 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 306 flights, with a median arrival 1 minute early.
The national on-time rate over the same period is 77.3%, so OO 5138 runs 10 points behind the country as a whole. Across a thousand flights that is about 100 extra late arrivals.
Key figures
On time
67.3%
Arrivals under 15 minutes late, of 278 completed flights
Avg delay
117 min
Across delayed arrivals only, not all flights
Cancelled
6.21%
National rate is 1.89%
1 hour+ late
17.3%
National rate is 8.3%
These figures cover 306 flights between September 2025 and August 2026. Beyond the headline rate, 17.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 5138 flies
OO 5138 flies ORD to MGW without a single fixed slot. Its most common scheduled departure was 11:45, used on 90 of 306 flights, with 16:20 (41 flights) and 21:23 (36 flights) next.
- Departs 11:4590 flights29.4%
- Departs 16:2041 flights13.4%
- Departs 21:2336 flights11.8%
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 11:45 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 5138 runs 11 points worse at 67.3%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
OO 5138 next to ORD to MGW
Every carrier on ORD to MGW combined arrived on time 68.0% of the time across 321 flights, so OO 5138 is about level with it. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5138thin sample | 306 | 67.3% | 117 min | 6.21% | C− |
| All SkyWest Airlines on ORD–MGWthin sample | 321 | 68.0% | 115 min | 6.23% | C− |
| All carriers on ORD–MGWthin sample | 321 | 68.0% | 115 min | 6.23% | C− |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5138 quarter by quarter
Quarter by quarter OO 5138 held fairly steady: 67.5% in Oct–Dec 2025, 67.1% in Jan–Mar 2026, 66.0% in Apr–Jun 2026 and 72.7% in Jul–Sep 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights—
- Oct–Dec 202591 flights67.5%
- Jan–Mar 202690 flights67.1%
- Apr–Jun 202650 flights66.0%
- Jul–Sep 202645 flights72.7%
Scale runs 60% to 80%. Rows with fewer than 30 flights show a dash.
By weekday, OO 5138 did best on Tuesday at 76.7% on time and worst on Monday at 55.8%. Each day rests on about 44 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5138 runs when it is late
When OO 5138 is late it tends to be very late: 48 of its 91 late arrivals were an hour or more behind, and 20 were two hours or more.
- 15+ min early68 flights24.5%
- Within 15 min119 flights42.8%
- 15–29 min late20 flights7.2%
- 30–59 min late23 flights8.3%
- 1–2 hours late28 flights10.1%
- 2+ hours late20 flights7.2%
Scale runs 0% to 100%.
Share of 278 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 79 departures that left 15 minutes late or more, only 5 made it up before arrival. In the other direction, 17 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at MGW.
The worst days
Worst days for OO 5138
The latest arrival of the period was on 24 May 2026, 18 hours 2 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.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 24 May 2026 | 18 hours 2 minutes | Carrier |
| 29 December 2025 | 12 hours 34 minutes | Carrier |
| 2 December 2025 | 11 hours 58 minutes | Carrier |
| 1 January 2026 | 10 hours 11 minutes | National Airspace System |
| 19 November 2025 | 10 hours 2 minutes | National Airspace System |
Delay causes
Why OO 5138 runs late
Carrier accounts for 55% of the 11,000 delay minutes carriers reported here, and the remaining four split what is left.
- 55%Carrier
- 22%National Airspace System
- 19%Late-arriving aircraft
- 4%Extreme weather
The largest share of delay minutes, 55%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 5,892 of the 11,000 delay minutes reported here. The split is drawn from 10,642 delay minutes reported on OO 5138.
Cancellations run at 6.21%, against 1.89% 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
17.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection 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. 306 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: 6.21% of its 306 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.
Related
Where to go next
- Chicago O'Hare International (ORD) delay statistics
- SkyWest Airlines on-time record
- Every SkyWest Airlines flight number with a record
- The most and least reliable flight numbers in the US
- The best time of day to fly, according to 7.05 million flight records
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 ; recomputed monthly. How this data is collected.