Flight number record
OO 4658
SkyWest Airlines · Casper to Denver
- Route
- CPR → DEN
- Departs
- 13:23
- Flights
- 362
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4658, 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 4658 earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 11 points better than the national rate of 77.3%. When something does go wrong the average delay runs close to two hours. That rests on 362 flights, with a median arrival 17 minutes early.
Set against the rest of the country, OO 4658's record is 11 points better than the US average of 77.3%. That gap is worth roughly 112 fewer late arrivals for every thousand flights.
Key figures
On time
88.5%
Arrivals under 15 minutes late, of 356 completed flights
Avg delay
103 min
Across delayed arrivals only, not all flights
Cancelled
1.10%
National rate is 1.89%
1 hour+ late
5.3%
National rate is 8.3%
These figures cover 362 flights between September 2025 and August 2026. The median arrival is 17 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When OO 4658 flies
OO 4658 flies CPR to DEN without a single fixed slot. Its most common scheduled departure was 13:23, used on 81 of 362 flights, with 13:25 (59 flights) and 13:16 (37 flights) next.
- Departs 13:2381 flights22.4%
- Departs 13:2559 flights16.3%
- Departs 13:1637 flights10.2%
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 13:23 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 4658 runs 10 points better at 88.5%. 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 4658 next to CPR to DEN
Every carrier on CPR to DEN combined arrived on time 83.1% of the time across 2,629 flights, so OO 4658 is 5 points ahead of it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4658thin sample | 362 | 88.5% | 103 min | 1.10% | A |
| All SkyWest Airlines on CPR–DEN | 2,629 | 83.1% | 91 min | 0.95% | B+ |
| All carriers on CPR–DEN | 2,629 | 83.1% | 91 min | 0.95% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4658 quarter by quarter
OO 4658 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Apr–Jun 2026 at 85.2%, a swing of 12 points on roughly 72 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 flights96.7%
- Oct–Dec 202591 flights90.1%
- Jan–Mar 202689 flights88.5%
- Apr–Jun 202691 flights85.2%
- Jul–Sep 202661 flights86.7%
Scale runs 75% to 100%.
By weekday, OO 4658 ranged from 86.3% on Thursday to 94.2% on Monday. With about 52 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 4658 runs when it is late
OO 4658 often beats the schedule: 201 of 356 completed flights, 56%, arrived 15 minutes or more early. The 41 late arrivals split 13 under half an hour, 9 between 30 and 60 minutes, and 19 an hour or more.
- 15+ min early201 flights56.5%
- Within 15 min114 flights32.0%
- 15–29 min late13 flights3.7%
- 30–59 min late9 flights2.5%
- 1–2 hours late8 flights2.2%
- 2+ hours late11 flights3.1%
Scale runs 0% to 100%.
Share of 356 completed flights by arrival against schedule.
A late pushback is often recovered here: of 60 departures that left 15 minutes late or more, 21 still arrived on time. Only 2 left on time and still arrived late.
The worst days
Worst days for OO 4658
The latest arrival of the period was on 23 January 2026, 10 hours 16 minutes behind schedule; most of its delay minutes were filed as extreme weather. The five worst days are spread across January, August, October and February, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 23 January 2026 | 10 hours 16 minutes | Extreme weather |
| 23 August 2026 | 6 hours 51 minutes | Carrier |
| 23 October 2025 | 6 hours 34 minutes | Extreme weather |
| 17 February 2026 | 4 hours 24 minutes | Late-arriving aircraft |
| 24 February 2026 | 3 hours 24 minutes | Late-arriving aircraft |
Delay causes
Why OO 4658 runs late
Late-arriving aircraft accounts for 49% of the 4,216 delay minutes carriers reported here, and the remaining four split what is left.
- 49%Late-arriving aircraft
- 24%Extreme weather
- 18%Carrier
- 9%National Airspace System
Extreme weather accounts for 24% 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 4.1 times the usual weather exposure. The split is drawn from 4,216 delay minutes reported on OO 4658.
Cancellations sit at 1.10% against a national 1.89%, which is ordinary. Diversions add another 0.55%.
Connections and routes
What a delay on this flight costs
5.3% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last close to two hours, which a normal layover absorbs.
The same number turns up on three other city pairs in the data, including LAX to RDM (1), CID to ORD (1) and LAX to PHX (1), but none flew often enough under OO 4658 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to CPR to DEN only.
One caution: this is a thin sample. 362 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 4658
For a booking, OO 4658 has one of the better records a US domestic flight can show: 88.5% on time and 1.10% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- CPR to DEN, every carrier and departure
- DEN to CPR, the return direction
- SkyWest Airlines 5245 on the same route84.0%
- SkyWest Airlines 5818 on the same route88.1%
- SkyWest Airlines 5513 on the same route91.6%
- SkyWest Airlines 4631 on the same route83.8%
- SkyWest Airlines 4666 on the same route77.1%
- SkyWest Airlines 5809 on the same route77.1%
- Denver International (DEN) 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.