Flight number record
OO 4719
SkyWest Airlines · Colorado Springs to Denver
- Route
- COS → DEN
- Departs
- 17:05
- Flights
- 303
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4719, 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 4719 draws a C. About one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 303 flights, with a median arrival 2 minutes late.
The national on-time rate over the same period is 77.3%, so OO 4719 runs 10 points behind the country as a whole. Across a thousand flights that is about 96 extra late arrivals.
Key figures
On time
67.7%
Arrivals under 15 minutes late, of 294 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
2.97%
National rate is 1.89%
1 hour+ late
14.3%
National rate is 8.3%
These figures cover 303 flights between September 2025 and August 2026. Beyond the headline rate, 14.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 4719 flies
OO 4719 flies COS to DEN without a single fixed slot. Its most common scheduled departure was 17:05, used on 91 of 303 flights, with 17:10 (69 flights) and 17:07 (40 flights) next.
- Departs 17:0591 flights30.0%
- Departs 17:1069 flights22.8%
- Departs 17:0740 flights13.2%
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 17:05 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and OO 4719 runs level with that at 67.7%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
OO 4719 next to COS to DEN
Every carrier on COS to DEN combined arrived on time 81.4% of the time across 4,989 flights, so OO 4719 is 14 points behind it. SkyWest flew 3,337 flights on the same city pair under all its flight numbers, including this one, and those ran 83.4% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4719thin sample | 303 | 67.7% | 70 min | 2.97% | C |
| All SkyWest Airlines on COS–DEN | 3,337 | 83.4% | 77 min | 1.53% | B |
| All carriers on COS–DEN | 4,989 | 81.4% | 72 min | 1.14% | B |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4719 quarter by quarter
OO 4719 did not run the same all year. Its best quarter was Apr–Jun 2026 at 85.7% on time and its weakest Jul–Sep 2026 at 57.6%, a swing of 28 points on roughly 76 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 202568 flights60.7%
- Jan–Mar 202689 flights71.9%
- Apr–Jun 202656 flights85.7%
- Jul–Sep 202661 flights57.6%
Scale runs 50% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, OO 4719 did best on Wednesday at 78.6% on time and worst on Tuesday at 55.8%. Each day rests on about 43 flights, so a gap of 23 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4719 runs when it is late
The 95 late arrivals split 33 under half an hour, 20 between 30 and 60 minutes, and 42 an hour or more.
- 15+ min early58 flights19.7%
- Within 15 min141 flights48.0%
- 15–29 min late33 flights11.2%
- 30–59 min late20 flights6.8%
- 1–2 hours late25 flights8.5%
- 2+ hours late17 flights5.8%
Scale runs 0% to 100%.
Share of 294 completed flights by arrival against schedule.
22 of 93 late departures made up the time and arrived on time, 24% of them. In the other direction, 24 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 4719
The latest arrival of the period was on 3 August 2026, 5 hours 5 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. Three of the five worst days fell in August 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 3 August 2026 | 5 hours 5 minutes | Late-arriving aircraft |
| 12 October 2025 | 3 hours 47 minutes | Late-arriving aircraft |
| 15 August 2026 | 3 hours 29 minutes | Late-arriving aircraft |
| 21 August 2026 | 3 hours 26 minutes | Extreme weather |
| 6 March 2026 | 3 hours 21 minutes | National Airspace System |
Delay causes
Why OO 4719 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 6,687 reported delay minutes.
- 40%National Airspace System
- 31%Late-arriving aircraft
- 19%Carrier
- 11%Extreme weather
40% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 2,660 minutes out of 6,687, against a national NAS share of 21%. The split is drawn from 6,687 delay minutes reported on OO 4719.
Cancellations run at 2.97%, against 1.89% nationally. That is roughly one flight in 30 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
14.3% 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 five other city pairs in the data, including ORD to BDL (24), BOI to DEN (16) and IAH to PNS (11), but none flew often enough under OO 4719 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to COS to DEN only.
One caution: this is a thin sample. 303 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 4719
For a booking, the cancellation rate is the figure to plan around on OO 4719: 2.97% of its 303 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
- COS to DEN, every carrier and departure
- DEN to COS, the return direction
- SkyWest Airlines 5634 on the same route85.0%
- SkyWest Airlines 4675 on the same route83.5%
- SkyWest Airlines 4696 on the same route89.7%
- SkyWest Airlines 5291 on the same route90.6%
- 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
- How often a connection fails at the major US hubs
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.