Flight number record

OO 4776

SkyWest Airlines · Greensboro to Chicago

Route: GSO → ORD
Departs: 17:32
Flights: 320
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 320 flights, with a median arrival 4 minutes late.

The national on-time rate over the same period is 77.6%, so OO 4776 runs 15 points behind the country as a whole. Across a thousand flights that is about 146 extra late arrivals.

On time

63.0%

Arrivals under 15 minutes late, of 303 completed flights

Avg delay

76 min

Across delayed arrivals only, not all flights

Cancelled

4.69%

National rate is 1.81%

1 hour+ late

12.9%

National rate is 8.1%

These figures cover 320 flights between July 2025 and June 2026. Beyond the headline rate, 12.9% 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 4776 flies

OO 4776 flies GSO to ORD without a single fixed slot. Its most common scheduled departure was 17:32, used on 100 of 320 flights, with 17:28 (67 flights) and 17:39 (50 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 17:32100 flights31.3%
Departs 17:2867 flights20.9%
Departs 17:3950 flights15.6%

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 17:32 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and OO 4776 runs 5 points worse at 63.0%. 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 4776 next to GSO to ORD

Every carrier on GSO to ORD combined arrived on time 77.9% of the time across 1,556 flights, so OO 4776 is 15 points behind it. SkyWest flew 600 flights on the same city pair under all its flight numbers, including this one, and those ran 72.5% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 16 points.

OO 4776 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4776thin sample	320	63.0%	76 min	4.69%	D−
All SkyWest Airlines on GSO–ORD	600	72.5%	73 min	3.83%	C−
All carriers on GSO–ORD	1,556	77.9%	76 min	3.28%	B−
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	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 69.3% on time and its weakest Jan–Mar 2026 at 58.5%, a swing of 11 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 202591 flights69.3%
Oct–Dec 202590 flights58.6%
Jan–Mar 202689 flights58.5%
Apr–Jun 202650 flights67.4%

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

By weekday, OO 4776 did best on Monday at 70.7% on time and worst on Friday at 53.5%. Each day rests on about 46 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

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 8,487 reported delay minutes.

Late-arriving aircraft
40%
National Airspace System
35%
Carrier
20%
Extreme weather
5%

40% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 8,487 reported delay minutes here, that single category outweighs weather by 7 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 8,487 delay minutes reported on OO 4776.

Cancellations run at 4.69%, against 1.81% 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 12.9% 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 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

The same number turns up on three other city pairs in the data, including DEN to FSD (28), ORD to TVC (1) and PHX to LAX (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. 320 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: 4.69% of its 320 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.

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