Flight number record
OO 4687
SkyWest Airlines · Denver to Casper
- Route
- DEN → CPR
- Departs
- 11:28
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4687, 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 4687 lands a B, 2 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about 55 minutes on average. That rests on 364 flights, with a median arrival 5 minutes early.
Key figures
On time
78.8%
Arrivals under 15 minutes late, of 358 completed flights
Avg delay
55 min
Across delayed arrivals only, not all flights
Cancelled
1.10%
National rate is 1.89%
1 hour+ late
4.7%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. The median arrival is 5 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 4687 flies
OO 4687 flies DEN to CPR without a single fixed slot. Its most common scheduled departure was 11:28, used on 103 of 364 flights, with 11:20 (74 flights) and 11:30 (74 flights) next.
- Departs 11:28103 flights28.3%
- Departs 11:2074 flights20.3%
- Departs 11:3074 flights20.3%
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 11:28 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 4687 runs level with that at 78.8%. 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 4687 next to DEN to CPR
Every carrier on DEN to CPR combined arrived on time 77.7% of the time across 2,629 flights, so OO 4687 is about level with it. Across its whole network SkyWest Airlines managed 78.7%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4687thin sample | 364 | 78.8% | 55 min | 1.10% | B |
| All SkyWest Airlines on DEN–CPR | 2,629 | 77.7% | 82 min | 0.95% | B+ |
| All carriers on DEN–CPR | 2,629 | 77.7% | 82 min | 0.95% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4687 quarter by quarter
Quarter by quarter OO 4687 held fairly steady: 76.7% in Jul–Sep 2025, 82.4% in Oct–Dec 2025, 77.0% in Jan–Mar 2026, 74.2% in Apr–Jun 2026 and 83.6% in Jul–Sep 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights76.7%
- Oct–Dec 202592 flights82.4%
- Jan–Mar 202689 flights77.0%
- Apr–Jun 202691 flights74.2%
- Jul–Sep 202662 flights83.6%
Scale runs 65% to 90%.
By weekday, OO 4687 ranged from 76.5% on Saturday to 85.4% on Friday. With about 52 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 4687 runs when it is late
The 76 late arrivals split 23 under half an hour, 36 between 30 and 60 minutes, and 17 an hour or more.
- 15+ min early79 flights22.1%
- Within 15 min203 flights56.7%
- 15–29 min late23 flights6.4%
- 30–59 min late36 flights10.1%
- 1–2 hours late9 flights2.5%
- 2+ hours late8 flights2.2%
Scale runs 0% to 100%.
Share of 358 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 65 departures that left 15 minutes late or more, only 7 made it up before arrival. In the other direction, 18 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 CPR.
The worst days
Worst days for OO 4687
The latest arrival of the period was on 23 January 2026, 4 hours 56 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. Three of the five worst days fell in February 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 23 January 2026 | 4 hours 56 minutes | Late-arriving aircraft |
| 17 February 2026 | 3 hours 24 minutes | Late-arriving aircraft |
| 16 August 2026 | 3 hours 6 minutes | Carrier |
| 19 February 2026 | 3 hours 2 minutes | Late-arriving aircraft |
| 24 February 2026 | 3 hours 2 minutes | Carrier |
Delay causes
Why OO 4687 runs late
Carrier accounts for 43% of the 4,174 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Carrier
- 39%Late-arriving aircraft
- 16%National Airspace System
- 2%Extreme weather
39% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,174 reported delay minutes here, that single category outweighs weather by 18 to one. The split is drawn from 4,174 delay minutes reported on OO 4687.
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
Badly late arrivals are rare here: only 4.7% 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.
The same number turns up on two other city pairs in the data, including ASE to DEN (96) and DAY to ORD (1), but none flew often enough under OO 4687 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to CPR only.
One caution: this is a thin sample. 364 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 4687
For a booking, read OO 4687 as 78.8% on time with 1.10% cancelled over 364 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DEN to CPR, every carrier and departure
- CPR to DEN, the return direction
- SkyWest Airlines 5294 on the same route73.7%
- SkyWest Airlines 5802 on the same route71.5%
- SkyWest Airlines 5743 on the same route82.4%
- SkyWest Airlines 4797 on the same route85.2%
- SkyWest Airlines 5226 on the same route79.6%
- 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.