Flight number record
OO 4719
SkyWest Airlines · Colorado Springs to Denver
- Route
- COS → DEN
- Departs
- 17:05
- Flights
- 304
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 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 D. Roughly 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 304 flights, with a median arrival 6 minutes late.
The national on-time rate over the same period is 77.6%, so OO 4719 runs 14 points behind the country as a whole. Across a thousand flights that is about 142 extra late arrivals.
Key figures
On time
63.4%
Arrivals under 15 minutes late, of 295 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
2.96%
National rate is 1.81%
1 hour+ late
18.0%
National rate is 8.1%
These figures cover 304 flights between July 2025 and June 2026. Beyond the headline rate, 18.0% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
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 304 flights, with 17:10 (82 flights) and 17:20 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 17:0591 flights29.9%
- Departs 17:1082 flights27.0%
- Departs 17:2049 flights16.1%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
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 68.2%, and OO 4719 runs 5 points worse at 63.4%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Against the route
OO 4719 next to COS to DEN
Every carrier on COS to DEN combined arrived on time 78.8% of the time across 5,038 flights, so OO 4719 is 15 points behind it. SkyWest flew 3,282 flights on the same city pair under all its flight numbers, including this one, and those ran 81.3% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 16 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4719thin sample | 304 | 63.4% | 73 min | 2.96% | D |
| All SkyWest Airlines on COS–DEN | 3,282 | 81.3% | 75 min | 1.68% | B |
| All carriers on COS–DEN | 5,038 | 78.8% | 71 min | 1.33% | B |
| SkyWest Airlines, whole network | 852,935 | 79.0% | 88 min | 1.77% | 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 2025 at 42.7%, a swing of 43 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 202591 flights42.7%
- Oct–Dec 202568 flights60.7%
- Jan–Mar 202689 flights71.9%
- Apr–Jun 202656 flights85.7%
Scale runs 35% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, OO 4719 did best on Saturday at 75.0% on time and worst on Tuesday at 47.7%. Each day rests on about 43 flights, so a gap of 27 points is worth noticing but could still narrow in another year.
Delay causes
Why OO 4719 runs late
One category carries most of the weight here. National Airspace System accounts for 43% of the 7,848 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 43%National Airspace System
- 28%Late-arriving aircraft
- 15%Carrier
- 14%Extreme weather
Extreme weather accounts for 14% 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 2.2 times the usual weather exposure. The split is drawn from 7,848 delay minutes reported on OO 4719.
Cancellations run at 2.96%, against 1.81% 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
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 18.0% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
The same number turns up on four 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. 304 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: 2.96% of its 304 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 route83.2%
- SkyWest Airlines 4675 on the same route79.1%
- SkyWest Airlines 5291 on the same route87.7%
- SkyWest Airlines 4696 on the same route88.5%
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.