Flight number record
OO 4776
SkyWest Airlines · Greensboro to Chicago
- Route
- GSO → ORD
- Departs
- 17:28
- Flights
- 259
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4776, 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 4776 draws a D−. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 259 flights, with a median arrival 5 minutes late.
The national on-time rate over the same period is 77.3%, so OO 4776 runs 14 points behind the country as a whole. Across a thousand flights that is about 144 extra late arrivals.
Key figures
On time
62.9%
Arrivals under 15 minutes late, of 245 completed flights
Avg delay
71 min
Across delayed arrivals only, not all flights
Cancelled
5.02%
National rate is 1.89%
1 hour+ late
11.4%
National rate is 8.3%
These figures cover 259 flights between September 2025 and August 2026. Beyond the headline rate, 11.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 4776 flies
OO 4776 flies GSO to ORD without a single fixed slot. Its most common scheduled departure was 17:28, used on 54 of 259 flights, with 17:32 (52 flights) and 17:39 (50 flights) next.
- Departs 17:2854 flights20.8%
- Departs 17:3252 flights20.1%
- Departs 17:3950 flights19.3%
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 17:28 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and OO 4776 runs 5 points worse at 62.9%. 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 4776 next to GSO to ORD
Every carrier on GSO to ORD combined arrived on time 77.3% of the time across 1,560 flights, so OO 4776 is 14 points behind it. SkyWest flew 529 flights on the same city pair under all its flight numbers, including this one, and those ran 72.9% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 16 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4776thin sample | 259 | 62.9% | 71 min | 5.02% | D− |
| All SkyWest Airlines on GSO–ORD | 529 | 72.9% | 70 min | 4.16% | C− |
| All carriers on GSO–ORD | 1,560 | 77.3% | 81 min | 3.46% | B− |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4776 quarter by quarter
OO 4776 did not run the same all year. Its best quarter was Jul–Sep 2025 at 80.0% on time and its weakest Jan–Mar 2026 at 58.5%, a swing of 22 points on roughly 65 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 flights80.0%
- Oct–Dec 202590 flights58.6%
- Jan–Mar 202689 flights58.5%
- Apr–Jun 202650 flights67.4%
Scale runs 50% to 85%.
By weekday, OO 4776 did best on Monday at 70.6% on time and worst on Friday at 54.3%. Each day rests on about 37 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4776 runs when it is late
The 91 late arrivals split 39 under half an hour, 24 between 30 and 60 minutes, and 28 an hour or more.
- 15+ min early38 flights15.5%
- Within 15 min116 flights47.3%
- 15–29 min late39 flights15.9%
- 30–59 min late24 flights9.8%
- 1–2 hours late17 flights6.9%
- 2+ hours late11 flights4.5%
Scale runs 0% to 100%.
Share of 245 completed flights by arrival against schedule.
6 of 46 late departures made up the time and arrived on time, 13% of them. In the other direction, 51 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 ORD.
The worst days
Worst days for OO 4776
The latest arrival of the period was on 31 March 2026, 20 hours 36 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 31 March 2026 | 20 hours 36 minutes | Late-arriving aircraft |
| 30 January 2026 | 6 hours 41 minutes | National Airspace System |
| 4 May 2026 | 4 hours 18 minutes | Late-arriving aircraft |
| 7 March 2026 | 3 hours 34 minutes | Late-arriving aircraft |
| 21 February 2026 | 2 hours 57 minutes | Late-arriving aircraft |
Delay causes
Why OO 4776 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 6,485 reported delay minutes.
- 42%Late-arriving aircraft
- 33%National Airspace System
- 24%Carrier
- 2%Extreme weather
42% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,485 reported delay minutes here, that single category outweighs weather by 22 to one. The split is drawn from 6,485 delay minutes reported on OO 4776.
Cancellations run at 5.02%, against 1.89% nationally. That is about one flight in twenty 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
11.4% 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 589 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The same number turns up on three other city pairs in the data, including DEN to FSD (57), GEG to DEN (21) and ORD to TVC (1), but none flew often enough under OO 4776 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to GSO to ORD only.
One caution: this is a thin sample. 259 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 4776
For a booking, the cancellation rate is the figure to plan around on OO 4776: 5.02% of its 259 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- GSO to ORD, every carrier and departure
- ORD to GSO, the return direction
- Envoy Air 3413 on the same route87.8%
- 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
- Why the first flight of the morning is statistically safest
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.