Flight number record
OO 4808
SkyWest Airlines · Peoria to Chicago
- Route
- PIA → ORD
- Departs
- 17:19
- Flights
- 293
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 41.6% of flights arrive inside the 15-minute window, 36 points worse than the national rate of 77.3%. Late arrivals average a little over an hour. Treat any tight connection here as a coin flip. That rests on 293 flights, with a median arrival 21 minutes late.
The national on-time rate over the same period is 77.3%, so OO 4808 runs 36 points behind the country as a whole. Across a thousand flights that is about 357 extra late arrivals.
Key figures
On time
41.6%
Arrivals under 15 minutes late, of 279 completed flights
Avg delay
72 min
Across delayed arrivals only, not all flights
Cancelled
4.78%
National rate is 1.89%
1 hour+ late
22.9%
National rate is 8.3%
These figures cover 293 flights between September 2025 and August 2026. Beyond the headline rate, 22.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 4808 flies
OO 4808 flies PIA to ORD without a single fixed slot. Its most common scheduled departure was 17:19, used on 40 of 293 flights, with 17:18 (38 flights) and 17:43 (36 flights) next.
- Departs 17:1940 flights13.7%
- Departs 17:1838 flights13.0%
- Departs 17:4336 flights12.3%
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 17:19 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and OO 4808 runs 26 points worse at 41.6%. 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 4808 next to PIA to ORD
Every carrier on PIA to ORD combined arrived on time 70.5% of the time across 2,214 flights, so OO 4808 is 29 points behind it. SkyWest flew 1,213 flights on the same city pair under all its flight numbers, including this one, and those ran 65.0% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 37 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4808thin sample | 293 | 41.6% | 72 min | 4.78% | F− |
| All SkyWest Airlines on PIA–ORD | 1,213 | 65.0% | 98 min | 4.70% | C− |
| All carriers on PIA–ORD | 2,214 | 70.5% | 93 min | 4.65% | C− |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4808 quarter by quarter
OO 4808 did not run the same all year. Its best quarter was Jul–Sep 2026 at 62.2% on time and its weakest Apr–Jun 2026 at 35.2%, a swing of 27 points on roughly 73 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 202526 flights—
- Oct–Dec 202585 flights38.3%
- Jan–Mar 202685 flights42.0%
- Apr–Jun 202656 flights35.2%
- Jul–Sep 202641 flights62.2%
Scale runs 25% to 70%. Rows with fewer than 30 flights show a dash.
By weekday, OO 4808 did best on Monday at 52.6% on time and worst on Sunday at 16.7%. Each day rests on about 42 flights, so a gap of 36 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4808 runs when it is late
The 163 late arrivals split 52 under half an hour, 47 between 30 and 60 minutes, and 64 an hour or more.
- 15+ min early37 flights13.3%
- Within 15 min79 flights28.3%
- 15–29 min late52 flights18.6%
- 30–59 min late47 flights16.8%
- 1–2 hours late35 flights12.5%
- 2+ hours late29 flights10.4%
Scale runs 0% to 100%.
Share of 279 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 111 departures that left 15 minutes late or more, only 10 made it up before arrival. In the other direction, 62 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 4808
The latest arrival of the period was on 21 October 2025, 5 hours 31 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across October, November, May, January and December, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 21 October 2025 | 5 hours 31 minutes | Carrier |
| 30 November 2025 | 5 hours 20 minutes | National Airspace System |
| 9 May 2026 | 5 hours 20 minutes | Carrier |
| 25 January 2026 | 4 hours 42 minutes | Late-arriving aircraft |
| 29 December 2025 | 4 hours 33 minutes | Late-arriving aircraft |
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 12,000 reported delay minutes.
- 41%Late-arriving aircraft
- 28%National Airspace System
- 22%Carrier
- 8%Extreme weather
- 0%Security
41% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 12,000 reported delay minutes here, that single category outweighs weather by 5 to one. The split is drawn from 11,691 delay minutes reported on OO 4808.
Cancellations run at 4.78%, 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
22.9% 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 nine other city pairs in the data, including ORD to ICT (28), IAH to PNS (23) and STL to ORD (15), 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. 293 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: 4.78% of its 293 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
- PIA to ORD, every carrier and departure
- ORD to PIA, the return direction
- 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.