Flight number record
OO 5240
SkyWest Airlines · Denver to Grand Junction
- Route
- DEN → GJT
- Departs
- 21:05
- Flights
- 323
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5240, 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 5240 lands a B+, level with the national rate of 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 323 flights, with a median arrival 10 minutes early.
Key figures
On time
78.0%
Arrivals under 15 minutes late, of 322 completed flights
Avg delay
100 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
9.0%
National rate is 8.3%
These figures cover 323 flights between September 2025 and August 2026. Beyond the headline rate, 9.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 5240 flies
OO 5240 flies DEN to GJT without a single fixed slot. Its most common scheduled departure was 21:05, used on 90 of 323 flights, with 20:55 (81 flights) and 21:00 (71 flights) next.
- Departs 21:0590 flights27.9%
- Departs 20:5581 flights25.1%
- Departs 21:0071 flights22.0%
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 21:05 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and OO 5240 runs 8 points better at 78.0%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
OO 5240 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 5240 is 2 points behind 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%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5240thin sample | 323 | 78.0% | 100 min | 0.00% | B+ |
| 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 5240 quarter by quarter
OO 5240 did not run the same all year. Its best quarter was Oct–Dec 2025 at 94.8% on time and its weakest Jul–Sep 2026 at 61.5%, a swing of 33 points on roughly 65 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 202530 flights83.3%
- Oct–Dec 202577 flights94.8%
- Jan–Mar 202685 flights76.5%
- Apr–Jun 202691 flights70.3%
- Jul–Sep 202640 flights61.5%
Scale runs 55% to 100%.
By weekday, OO 5240 ranged from 73.9% on Sunday to 84.8% on Wednesday. With about 46 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 5240 runs when it is late
OO 5240 often beats the schedule: 121 of 322 completed flights, 38%, arrived 15 minutes or more early. The 71 late arrivals split 22 under half an hour, 20 between 30 and 60 minutes, and 29 an hour or more.
- 15+ min early121 flights37.6%
- Within 15 min130 flights40.4%
- 15–29 min late22 flights6.8%
- 30–59 min late20 flights6.2%
- 1–2 hours late18 flights5.6%
- 2+ hours late11 flights3.4%
Scale runs 0% to 100%.
Share of 322 completed flights by arrival against schedule.
9 of 65 late departures made up the time and arrived on time, 14% of them. 15 flights left on time and still arrived late.
The worst days
Worst days for OO 5240
The latest arrival of the period was on 31 July 2026, 11 hours 52 minutes behind schedule; most of its delay minutes were filed as security. Three of the five worst days fell in July 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 31 July 2026 | 11 hours 52 minutes | Security |
| 16 January 2026 | 11 hours 17 minutes | Carrier |
| 2 July 2026 | 10 hours 51 minutes | Carrier |
| 28 July 2026 | 10 hours 40 minutes | Late-arriving aircraft |
| 20 June 2026 | 10 hours 16 minutes | Late-arriving aircraft |
Delay causes
Why OO 5240 runs late
Late-arriving aircraft accounts for 42% of the 7,092 delay minutes carriers reported here, and the remaining four split what is left.
- 42%Late-arriving aircraft
- 38%Carrier
- 10%Security
- 9%National Airspace System
- 1%Extreme weather
42% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 7,092 reported delay minutes here, that single category outweighs weather by 42 to one. The split is drawn from 7,092 delay minutes reported on OO 5240.
Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
9.0% 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 two other city pairs in the data, including ICT to DEN (21) and DEN to COS (19), but none flew often enough under OO 5240 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. 323 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 5240
For a booking, read OO 5240 as 78.0% on time with 0.00% cancelled over 323 flights. Those are rates from the past twelve months, not a forecast for any particular day.
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%
- SkyWest Airlines 5488 on the same route86.1%
- United Airlines 1714 on the same route86.6%
- SkyWest Airlines 4704 on the same route87.6%
- United Airlines 431 on the same route69.1%
- 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.