Flight number record

OO 4808

SkyWest Airlines · Peoria to Chicago

Route: PIA → ORD
Departs: 17:25
Flights: 310
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4808, 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 4808 earns an F−, which is as low as this site's scale goes for a reason. Only 38.6% of flights arrive inside the 15-minute window, 39 points worse than the national rate of 77.6%. Late arrivals average a little over an hour. Treat any tight connection here as a coin flip. That rests on 310 flights, with a median arrival 24 minutes late.

The national on-time rate over the same period is 77.6%, so OO 4808 runs 39 points behind the country as a whole. Across a thousand flights that is about 390 extra late arrivals.

On time

38.6%

Arrivals under 15 minutes late, of 298 completed flights

Avg delay

79 min

Across delayed arrivals only, not all flights

Cancelled

3.87%

National rate is 1.81%

1 hour+ late

23.5%

National rate is 8.1%

These figures cover 310 flights between July 2025 and June 2026. Beyond the headline rate, 23.5% 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 4808 flies

OO 4808 flies PIA to ORD without a single fixed slot. Its most common scheduled departure was 17:25, used on 79 of 310 flights, with 17:19 (50 flights) and 17:18 (38 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 17:2579 flights25.5%
Departs 17:1950 flights16.1%
Departs 17:1838 flights12.3%

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 17:25 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and OO 4808 runs 30 points worse at 38.6%. 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 4808 next to PIA to ORD

Every carrier on PIA to ORD combined arrived on time 69.6% of the time across 2,311 flights, so OO 4808 is 31 points behind it. SkyWest flew 1,290 flights on the same city pair under all its flight numbers, including this one, and those ran 62.9% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 40 points.

OO 4808 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4808thin sample	310	38.6%	79 min	3.87%	F−
All SkyWest Airlines on PIA–ORD	1,290	62.9%	104 min	4.50%	D−
All carriers on PIA–ORD	2,311	69.6%	90 min	4.41%	C−
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4808 quarter by quarter

Quarter by quarter OO 4808 held fairly steady: 37.8% in Jul–Sep 2025, 38.3% in Oct–Dec 2025, 42.0% in Jan–Mar 2026 and 35.2% in Apr–Jun 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 202584 flights37.8%
Oct–Dec 202585 flights38.3%
Jan–Mar 202685 flights42.0%
Apr–Jun 202656 flights35.2%

Scale runs 25% to 45%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4808 did best on Monday at 51.2% on time and worst on Sunday at 13.6%. Each day rests on about 44 flights, so a gap of 38 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 4808 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 14,000 reported delay minutes.

Late-arriving aircraft
35%
National Airspace System
27%
Carrier
23%
Extreme weather
15%
Security
0%

Extreme weather accounts for 15% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.4 times the usual weather exposure. The split is drawn from 14,483 delay minutes reported on OO 4808.

Cancellations run at 3.87%, against 1.81% nationally. That is about one flight in 25 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. 23.5% 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 seven other city pairs in the data, including ORD to ICT (28), IAH to PNS (23) and ORD to GRB (11), but none flew often enough under OO 4808 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to PIA to ORD only.

One caution: this is a thin sample. 310 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 4808

For a booking, the cancellation rate is the figure to plan around on OO 4808: 3.87% of its 310 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