Flight number record
OO 4770
SkyWest Airlines · Denver to Grand Junction
- Route
- DEN → GJT
- Departs
- 15:45
- Flights
- 363
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4770, 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 4770 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 8 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 363 flights, with a median arrival 3 minutes early.
The national on-time rate over the same period is 77.3%, so OO 4770 runs 8 points behind the country as a whole. Across a thousand flights that is about 76 extra late arrivals.
Key figures
On time
69.7%
Arrivals under 15 minutes late, of 353 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
2.75%
National rate is 1.89%
1 hour+ late
12.7%
National rate is 8.3%
These figures cover 363 flights between September 2025 and August 2026. Beyond the headline rate, 12.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 4770 flies
OO 4770 flies DEN to GJT without a single fixed slot. Its most common scheduled departure was 15:45, used on 76 of 363 flights, with 16:20 (74 flights) and 15:50 (40 flights) next.
- Departs 15:4576 flights20.9%
- Departs 16:2074 flights20.4%
- Departs 15:5040 flights11.0%
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 15:45 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and OO 4770 runs 2 points worse at 69.7%. 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 4770 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 4770 is 10 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%, which this flight trails by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4770thin sample | 363 | 69.7% | 70 min | 2.75% | C |
| 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 4770 quarter by quarter
OO 4770 did not run the same all year. Its best quarter was Oct–Dec 2025 at 84.7% on time and its weakest Jul–Sep 2026 at 44.1%, a swing of 41 points on roughly 73 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 flights70.0%
- Oct–Dec 202591 flights84.7%
- Jan–Mar 202690 flights75.0%
- Apr–Jun 202691 flights67.0%
- Jul–Sep 202661 flights44.1%
Scale runs 35% to 90%.
By weekday, OO 4770 did best on Tuesday at 86.0% on time and worst on Monday at 54.9%. Each day rests on about 52 flights, so a gap of 31 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4770 runs when it is late
The 107 late arrivals split 29 under half an hour, 33 between 30 and 60 minutes, and 45 an hour or more.
- 15+ min early63 flights17.8%
- Within 15 min183 flights51.8%
- 15–29 min late29 flights8.2%
- 30–59 min late33 flights9.3%
- 1–2 hours late22 flights6.2%
- 2+ hours late23 flights6.5%
Scale runs 0% to 100%.
Share of 353 completed flights by arrival against schedule.
14 of 101 late departures made up the time and arrived on time, 14% of them. In the other direction, 20 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 GJT.
The worst days
Worst days for OO 4770
The latest arrival of the period was on 11 September 2025, 5 hours 2 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 |
|---|---|---|
| 11 September 2025 | 5 hours 2 minutes | Carrier |
| 30 November 2025 | 3 hours 31 minutes | Late-arriving aircraft |
| 16 March 2026 | 3 hours 11 minutes | Late-arriving aircraft |
| 9 July 2026 | 3 hours 6 minutes | Carrier |
| 2 March 2026 | 2 hours 57 minutes | Carrier |
Delay causes
Why OO 4770 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 7,486 reported delay minutes.
- 41%Carrier
- 37%Late-arriving aircraft
- 16%National Airspace System
- 6%Extreme weather
37% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 7,486 reported delay minutes here, that single category outweighs weather by 6 to one. The split is drawn from 7,486 delay minutes reported on OO 4770.
Cancellations run at 2.75%, against 1.89% nationally. That is roughly 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
12.7% 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 one other city pair in the data, including SGF to DEN (12), but none flew often enough under OO 4770 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. 363 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 4770
For a booking, the cancellation rate is the figure to plan around on OO 4770: 2.75% of its 363 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
- DEN to GJT, every carrier and departure
- GJT to DEN, the return direction
- 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%
- 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
- 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.