Flight number record
OO 5291
SkyWest Airlines · Colorado Springs to Denver
- Route
- COS → DEN
- Departs
- 06:00
- Flights
- 311
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5291, 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 5291 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 13 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 311 flights, with a median arrival 17 minutes early.
Set against the rest of the country, OO 5291's record is 13 points better than the US average of 77.3%. That gap is worth roughly 133 fewer late arrivals for every thousand flights.
Key figures
On time
90.6%
Arrivals under 15 minutes late, of 309 completed flights
Avg delay
80 min
Across delayed arrivals only, not all flights
Cancelled
0.64%
National rate is 1.89%
1 hour+ late
2.9%
National rate is 8.3%
These figures cover 311 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 5291 flies
OO 5291 flies COS to DEN without a single fixed slot. Its most common scheduled departure was 06:00, used on 235 of 311 flights, with 05:50 (36 flights) next.
- Departs 06:00235 flights75.6%
- Departs 05:5036 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 06:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 5291 runs level with that at 90.6%. 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 5291 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 5291 is 9 points ahead of 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 beats by 12 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5291thin sample | 311 | 90.6% | 80 min | 0.64% | A+ |
| 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 5291 quarter by quarter
Quarter by quarter OO 5291 held fairly steady: 86.7% in Jul–Sep 2025, 90.7% in Oct–Dec 2025, 90.8% in Jan–Mar 2026, 90.5% in Apr–Jun 2026 and 92.6% in Jul–Sep 2026. A spread of 6 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights86.7%
- Oct–Dec 202554 flights90.7%
- Jan–Mar 202689 flights90.8%
- Apr–Jun 202684 flights90.5%
- Jul–Sep 202654 flights92.6%
Scale runs 80% to 100%.
By weekday, OO 5291 ranged from 87.0% on Monday to 93.8% on Tuesday. With about 44 flights behind each day, a spread of 7 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 5291 runs when it is late
OO 5291 often beats the schedule: 169 of 309 completed flights, 55%, arrived 15 minutes or more early. The 29 late arrivals split 12 under half an hour, 8 between 30 and 60 minutes, and 9 an hour or more.
- 15+ min early169 flights54.7%
- Within 15 min111 flights35.9%
- 15–29 min late12 flights3.9%
- 30–59 min late8 flights2.6%
- 1–2 hours late4 flights1.3%
- 2+ hours late5 flights1.6%
Scale runs 0% to 100%.
Share of 309 completed flights by arrival against schedule.
7 of 28 late departures made up the time and arrived on time, 25% of them. 8 flights left on time and still arrived late.
The worst days
Worst days for OO 5291
The latest arrival of the period was on 7 March 2026, 8 hours 29 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 March 2026 | 8 hours 29 minutes | Carrier |
| 16 July 2026 | 7 hours 50 minutes | Carrier |
| 12 April 2026 | 2 hours 47 minutes | Carrier |
| 10 August 2026 | 2 hours 38 minutes | Carrier |
| 7 April 2026 | 2 hours 10 minutes | Carrier |
Delay causes
Why OO 5291 runs late
Carrier accounts for 96% of the 2,331 delay minutes carriers reported here, and the remaining four split what is left.
- 96%Carrier
- 4%National Airspace System
The largest share of delay minutes, 96%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,239 of the 2,331 delay minutes reported here. The split is drawn from 2,331 delay minutes reported on OO 5291.
Cancellations are rare at 0.64%, 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 2.9% 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 three other city pairs in the data, including DEN to MSP (25), IAH to OKC (10) and ORD to ATW (1), but none flew often enough under OO 5291 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. 311 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 5291
For a booking, OO 5291 has one of the better records a US domestic flight can show: 90.6% on time and 0.64% cancelled. That is a base rate, not a promise about any single day.
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 4719 on the same route67.7%
- 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.