Flight number record

OO 4766

SkyWest Airlines · Chicago to Oklahoma City

Route: ORD → OKC
Departs: 15:35
Flights: 315
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4766, 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 4766 sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 315 flights, with a median arrival 6 minutes early.

The national on-time rate over the same period is 77.3%, so OO 4766 runs 4 points behind the country as a whole. Across a thousand flights that is about 41 extra late arrivals.

On time

73.2%

Arrivals under 15 minutes late, of 306 completed flights

Avg delay

75 min

Across delayed arrivals only, not all flights

Cancelled

2.86%

National rate is 1.89%

1 hour+ late

10.1%

National rate is 8.3%

These figures cover 315 flights between September 2025 and August 2026. Beyond the headline rate, 10.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

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Schedule

When OO 4766 flies

OO 4766 flies ORD to OKC without a single fixed slot. Its most common scheduled departure was 15:35, used on 82 of 315 flights, with 16:45 (58 flights) and 16:22 (37 flights) next.

Departs 15:3582 flights26.0%
Departs 16:4558 flights18.4%
Departs 16:2237 flights11.7%

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 15:35 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and OO 4766 runs level with that at 73.2%. 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 4766 next to ORD to OKC

Every carrier on ORD to OKC combined arrived on time 69.5% of the time across 2,623 flights, so OO 4766 is 4 points ahead of it. SkyWest flew 2,343 flights on the same city pair under all its flight numbers, including this one, and those ran 68.3% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 6 points.

OO 4766 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4766thin sample	315	73.2%	75 min	2.86%	C
All SkyWest Airlines on ORD–OKC	2,343	68.3%	89 min	3.46%	C−
All carriers on ORD–OKC	2,623	69.5%	89 min	3.24%	C−
SkyWest Airlines, whole network	855,406	78.7%	88 min	1.79%	B

Across the year

OO 4766 quarter by quarter

Quarter by quarter OO 4766 held fairly steady: 72.7% in Oct–Dec 2025, 69.5% in Jan–Mar 2026, 69.7% in Apr–Jun 2026 and 77.5% in Jul–Sep 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 202529 flights—
Oct–Dec 202569 flights72.7%
Jan–Mar 202685 flights69.5%
Apr–Jun 202691 flights69.7%
Jul–Sep 202641 flights77.5%

Scale runs 60% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4766 did best on Thursday at 81.8% on time and worst on Tuesday at 63.8%. Each day rests on about 45 flights, so a gap of 18 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late OO 4766 runs when it is late

OO 4766 often beats the schedule: 96 of 306 completed flights, 31%, arrived 15 minutes or more early. The 82 late arrivals split 23 under half an hour, 28 between 30 and 60 minutes, and 31 an hour or more.

15+ min early96 flights31.4%
Within 15 min128 flights41.8%
15–29 min late23 flights7.5%
30–59 min late28 flights9.2%
1–2 hours late19 flights6.2%
2+ hours late12 flights3.9%

Scale runs 0% to 100%.

Share of 306 completed flights by arrival against schedule.

Time lost at the gate mostly stays lost. Of 69 departures that left 15 minutes late or more, only 8 made it up before arrival. In the other direction, 21 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 OKC.

The worst days

Worst days for OO 4766

The latest arrival of the period was on 6 March 2026, 6 hours 46 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The five worst days are spread across March, July, January and December, with no single month standing out.

The latest arrivals of OO 4766 in the period
Date	Arrived late by	Largest filed cause
6 March 2026	6 hours 46 minutes	National Airspace System
4 July 2026	6 hours 5 minutes	Late-arriving aircraft
30 January 2026	6 hours	Extreme weather
2 December 2025	4 hours 45 minutes	Late-arriving aircraft
28 July 2026	4 hours 39 minutes	Carrier

Delay causes

Why OO 4766 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 6,166 reported delay minutes.

Late-arriving aircraft
34%
Carrier
29%
National Airspace System
29%
Extreme weather
7%
Security
1%

34% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,166 reported delay minutes here, that single category outweighs weather by 5 to one. The split is drawn from 6,166 delay minutes reported on OO 4766.

Cancellations run at 2.86%, against 1.89% nationally. That is roughly one flight in 30 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

10.1% 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 693 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 five other city pairs in the data, including PIT to ORD (16), DEN to MKE (15) and MSP to ORD (5), but none flew often enough under OO 4766 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ORD to OKC only.

One caution: this is a thin sample. 315 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 4766

For a booking, the cancellation rate is the figure to plan around on OO 4766: 2.86% of its 315 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures