Flight number record
OO 5818
SkyWest Airlines · Casper to Denver
- Route
- CPR → DEN
- Departs
- 07:00
- Flights
- 362
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5818, 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 5818 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 about an hour. That rests on 362 flights, with a median arrival 17 minutes early.
Set against the rest of the country, OO 5818's record is 11 points better than the US average of 77.3%. That gap is worth roughly 108 fewer late arrivals for every thousand flights.
Key figures
On time
88.1%
Arrivals under 15 minutes late, of 361 completed flights
Avg delay
66 min
Across delayed arrivals only, not all flights
Cancelled
0.28%
National rate is 1.89%
1 hour+ late
3.3%
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 5818 flies
OO 5818 flies CPR to DEN without a single fixed slot. Its most common scheduled departure was 07:00, used on 162 of 362 flights, with 07:05 (158 flights) and 07:10 (42 flights) next.
- Departs 07:00162 flights44.8%
- Departs 07:05158 flights43.6%
- Departs 07:1042 flights11.6%
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 07:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 5818 runs level with that at 88.1%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
OO 5818 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 5818 is 5 points ahead of it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5818thin sample | 362 | 88.1% | 66 min | 0.28% | 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 5818 quarter by quarter
OO 5818 did not run the same all year. Its best quarter was Jan–Mar 2026 at 94.4% on time and its weakest Jul–Sep 2026 at 77.4%, a swing of 17 points on roughly 91 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 202529 flights—
- Oct–Dec 202592 flights87.9%
- Jan–Mar 202689 flights94.4%
- Apr–Jun 202690 flights92.2%
- Jul–Sep 202662 flights77.4%
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, OO 5818 did best on Tuesday at 92.3% on time and worst on Friday at 76.9%. Each day rests on about 52 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5818 runs when it is late
OO 5818 often beats the schedule: 213 of 361 completed flights, 59%, arrived 15 minutes or more early. The 43 late arrivals split 19 under half an hour, 12 between 30 and 60 minutes, and 12 an hour or more.
- 15+ min early213 flights59.0%
- Within 15 min105 flights29.1%
- 15–29 min late19 flights5.3%
- 30–59 min late12 flights3.3%
- 1–2 hours late5 flights1.4%
- 2+ hours late7 flights1.9%
Scale runs 0% to 100%.
Share of 361 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 27 departures that left 15 minutes late or more, only 3 made it up before arrival. In the other direction, 19 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 DEN.
The worst days
Worst days for OO 5818
The latest arrival of the period was on 15 March 2026, 7 hours 1 minute behind schedule; most of its delay minutes were filed as a late-arriving aircraft. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 15 March 2026 | 7 hours 1 minute | Late-arriving aircraft |
| 5 October 2025 | 4 hours 28 minutes | Carrier |
| 25 August 2026 | 4 hours 6 minutes | Carrier |
| 20 November 2025 | 2 hours 43 minutes | Extreme weather |
| 17 September 2025 | 2 hours 35 minutes | Carrier |
Delay causes
Why OO 5818 runs late
Carrier accounts for 69% of the 2,849 delay minutes carriers reported here, and the remaining four split what is left.
- 69%Carrier
- 18%Late-arriving aircraft
- 7%Extreme weather
- 6%National Airspace System
The largest share of delay minutes, 69%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,963 of the 2,849 delay minutes reported here. The split is drawn from 2,849 delay minutes reported on OO 5818.
Cancellations are rare at 0.28%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 3.3% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
Every one of the 362 flights under OO 5818 in the data flew CPR to DEN. The number was not reused on any other city pair, which makes this a clean record of one route.
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 5818
For a booking, OO 5818 has one of the better records a US domestic flight can show: 88.1% on time and 0.28% 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 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%
- 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
- Worst months to fly in the US, ranked by the data
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.