Flight number record
OO 5488
SkyWest Airlines · Denver to Grand Junction
- Route
- DEN → GJT
- Departs
- 13:25
- Flights
- 346
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5488, 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 5488 earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 346 flights, with a median arrival 10 minutes early.
Set against the rest of the country, OO 5488's record is 9 points better than the US average of 77.3%. That gap is worth roughly 88 fewer late arrivals for every thousand flights.
Key figures
On time
86.1%
Arrivals under 15 minutes late, of 337 completed flights
Avg delay
56 min
Across delayed arrivals only, not all flights
Cancelled
2.60%
National rate is 1.89%
1 hour+ late
5.9%
National rate is 8.3%
These figures cover 346 flights between September 2025 and August 2026. The median arrival is 10 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 5488 flies
OO 5488 flies DEN to GJT without a single fixed slot. Its most common scheduled departure was 13:25, used on 175 of 346 flights, with 13:34 (45 flights) and 13:31 (37 flights) next.
- Departs 13:25175 flights50.6%
- Departs 13:3445 flights13.0%
- Departs 13:3137 flights10.7%
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 13:25 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 5488 runs 8 points better at 86.1%. 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 5488 next to DEN to GJT
Every carrier on DEN to GJT combined arrived on time 79.9% of the time across 2,282 flights, so OO 5488 is 6 points ahead of it. SkyWest flew 1,550 flights on the same city pair under all its flight numbers, including this one, and those ran 80.9% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5488thin sample | 346 | 86.1% | 56 min | 2.60% | A |
| All SkyWest Airlines on DEN–GJT | 1,550 | 80.9% | 70 min | 1.87% | B |
| All carriers on DEN–GJT | 2,282 | 79.9% | 67 min | 1.31% | B |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5488 quarter by quarter
OO 5488 did not run the same all year. Its best quarter was Oct–Dec 2025 at 95.7% on time and its weakest Jul–Sep 2026 at 80.6%, a swing of 15 points on roughly 87 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 202528 flights—
- Oct–Dec 202575 flights95.7%
- Jan–Mar 202690 flights85.1%
- Apr–Jun 202691 flights82.4%
- Jul–Sep 202662 flights80.6%
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, OO 5488 did best on Sunday at 91.7% on time and worst on Friday at 78.3%. Each day rests on about 49 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5488 runs when it is late
OO 5488 often beats the schedule: 103 of 337 completed flights, 31%, arrived 15 minutes or more early. The 47 late arrivals split 11 under half an hour, 16 between 30 and 60 minutes, and 20 an hour or more.
- 15+ min early103 flights30.6%
- Within 15 min187 flights55.5%
- 15–29 min late11 flights3.3%
- 30–59 min late16 flights4.7%
- 1–2 hours late18 flights5.3%
- 2+ hours late2 flights0.6%
Scale runs 0% to 100%.
Share of 337 completed flights by arrival against schedule.
6 of 47 late departures made up the time and arrived on time, 13% of them. Only 6 left on time and still arrived late.
The worst days
Worst days for OO 5488
The latest arrival of the period was on 28 July 2026, 2 hours 7 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 28 July 2026 | 2 hours 7 minutes | Carrier |
| 15 August 2026 | 2 hours 7 minutes | National Airspace System |
| 12 March 2026 | 1 hour 46 minutes | National Airspace System |
| 23 January 2026 | 1 hour 38 minutes | Carrier |
| 12 July 2026 | 1 hour 32 minutes | Carrier |
Delay causes
Why OO 5488 runs late
Carrier accounts for 53% of the 2,629 delay minutes carriers reported here, and the remaining four split what is left.
- 53%Carrier
- 24%National Airspace System
- 20%Late-arriving aircraft
- 3%Extreme weather
The largest share of delay minutes, 53%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,389 of the 2,629 delay minutes reported here. The split is drawn from 2,629 delay minutes reported on OO 5488.
Cancellations run at 2.60%, against 1.89% nationally. That is about one flight in 40 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
5.9% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
The same number turns up on one other city pair in the data, including ORD to ABE (15), but none flew often enough under OO 5488 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to GJT only.
One caution: this is a thin sample. 346 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 5488
For a booking, the cancellation rate is the figure to plan around on OO 5488: 2.60% of its 346 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- DEN to GJT, every carrier and departure
- GJT to DEN, the return direction
- SkyWest Airlines 4770 on the same route69.7%
- United Airlines 1714 on the same route86.6%
- SkyWest Airlines 4704 on the same route87.6%
- United Airlines 431 on the same route69.1%
- SkyWest Airlines 5240 on the same route78.0%
- 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
- What a cancellation rate actually tells you (and what it hides)
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.