Flight number record
OO 5809
SkyWest Airlines · Casper to Denver
- Route
- CPR → DEN
- Departs
- 15:15
- Flights
- 267
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5809, 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 5809 lands a B, level with the national rate of 77.3%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 267 flights, with a median arrival 9 minutes early.
Key figures
On time
77.1%
Arrivals under 15 minutes late, of 262 completed flights
Avg delay
91 min
Across delayed arrivals only, not all flights
Cancelled
1.50%
National rate is 1.89%
1 hour+ late
12.2%
National rate is 8.3%
These figures cover 267 flights between September 2025 and August 2026. Beyond the headline rate, 12.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 5809 flies
OO 5809 flies CPR to DEN without a single fixed slot. Its most common scheduled departure was 15:15, used on 80 of 267 flights, with 15:17 (53 flights) and 15:18 (36 flights) next.
- Departs 15:1580 flights30.0%
- Departs 15:1753 flights19.9%
- Departs 15:1836 flights13.5%
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 15:15 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and OO 5809 runs 5 points better at 77.1%. 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 5809 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 5809 is 6 points behind it. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5809thin sample | 267 | 77.1% | 91 min | 1.50% | B |
| 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 5809 quarter by quarter
OO 5809 did not run the same all year. Its best quarter was Jan–Mar 2026 at 82.8% on time and its weakest Apr–Jun 2026 at 67.9%, a swing of 15 points on roughly 89 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 flights—
- Oct–Dec 202591 flights78.9%
- Jan–Mar 202690 flights82.8%
- Apr–Jun 202656 flights67.9%
Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, OO 5809 did best on Tuesday at 83.8% on time and worst on Friday at 69.4%. Each day rests on about 38 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5809 runs when it is late
OO 5809 often beats the schedule: 96 of 262 completed flights, 37%, arrived 15 minutes or more early. When OO 5809 is late it tends to be very late: 32 of its 60 late arrivals were an hour or more behind, and 16 were two hours or more.
- 15+ min early96 flights36.6%
- Within 15 min106 flights40.5%
- 15–29 min late12 flights4.6%
- 30–59 min late16 flights6.1%
- 1–2 hours late16 flights6.1%
- 2+ hours late16 flights6.1%
Scale runs 0% to 100%.
Share of 262 completed flights by arrival against schedule.
11 of 60 late departures made up the time and arrived on time, 18% of them. 11 flights left on time and still arrived late.
The worst days
Worst days for OO 5809
The latest arrival of the period was on 30 September 2025, 6 hours 5 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 30 September 2025 | 6 hours 5 minutes | Late-arriving aircraft |
| 23 January 2026 | 4 hours 24 minutes | Late-arriving aircraft |
| 5 May 2026 | 4 hours 12 minutes | Late-arriving aircraft |
| 23 October 2025 | 3 hours 57 minutes | National Airspace System |
| 14 February 2026 | 3 hours 27 minutes | Carrier |
Delay causes
Why OO 5809 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 5,467 reported delay minutes.
- 37%Late-arriving aircraft
- 32%National Airspace System
- 20%Carrier
- 12%Extreme weather
Extreme weather accounts for 12% 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 1.9 times the usual weather exposure. The split is drawn from 5,467 delay minutes reported on OO 5809.
Cancellations sit at 1.50% against a national 1.89%, which is ordinary. Diversions add another 0.37%.
Connections and routes
What a delay on this flight costs
12.2% 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 three other city pairs in the data, including GSP to DEN (29), ORD to ILM (21) and IAH to PHX (1), but none flew often enough under OO 5809 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. 267 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 5809
For a booking, OO 5809 is a flight to put a long connection behind. 12.2% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
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 4658 on the same route88.5%
- SkyWest Airlines 5513 on the same route91.6%
- SkyWest Airlines 4631 on the same route83.8%
- SkyWest Airlines 4666 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.