Flight number record
OO 4234
SkyWest Airlines · Salt Lake City to Grand Junction
- Route
- SLC → GJT
- Departs
- 20:50
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4234, 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 4234 earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 19 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 50 minutes. That rests on 365 flights, with a median arrival 19 minutes early.
Set against the rest of the country, OO 4234's record is 19 points better than the US average of 77.3%. That gap is worth roughly 188 fewer late arrivals for every thousand flights.
Key figures
On time
96.1%
Arrivals under 15 minutes late, of 363 completed flights
Avg delay
52 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
1.4%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 19 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 4234 flies
OO 4234 flies SLC to GJT without a single fixed slot. Its most common scheduled departure was 20:50, used on 135 of 365 flights, with 21:30 (109 flights) and 20:55 (97 flights) next.
- Departs 20:50135 flights37.0%
- Departs 21:30109 flights29.9%
- Departs 20:5597 flights26.6%
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 20:50 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and OO 4234 runs 26 points better at 96.1%. 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 4234 next to SLC to GJT
Every carrier on SLC to GJT combined arrived on time 94.7% of the time across 584 flights, so OO 4234 is about level with it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 17 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4234 | 365 | 96.1% | 52 min | 0.00% | A+ |
| All SkyWest Airlines on SLC–GJT | 584 | 94.7% | 54 min | 0.00% | A+ |
| All carriers on SLC–GJT | 584 | 94.7% | 54 min | 0.00% | A+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4234 quarter by quarter
OO 4234 did not run the same all year. Its best quarter was Oct–Dec 2025 at 98.9% on time and its weakest Jul–Sep 2026 at 88.7%, a swing of 10 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 flights96.7%
- Oct–Dec 202592 flights98.9%
- Jan–Mar 202690 flights97.8%
- Apr–Jun 202691 flights96.7%
- Jul–Sep 202662 flights88.7%
Scale runs 80% to 100%.
By weekday, OO 4234 ranged from 92.2% on Friday to 98.1% on Thursday. With about 52 flights behind each day, a spread of 6 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 4234 runs when it is late
OO 4234 often beats the schedule: 259 of 363 completed flights, 71%, arrived 15 minutes or more early. The 14 late arrivals split 3 under half an hour, 6 between 30 and 60 minutes, and 5 an hour or more.
- 15+ min early259 flights71.3%
- Within 15 min90 flights24.8%
- 15–29 min late3 flights0.8%
- 30–59 min late6 flights1.7%
- 1–2 hours late4 flights1.1%
- 2+ hours late1 flights0.3%
Scale runs 0% to 100%.
Share of 363 completed flights by arrival against schedule.
Only 18 of 363 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for OO 4234
The latest arrival of the period was on 16 January 2026, 2 hours 17 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 16 January 2026 | 2 hours 17 minutes | Carrier |
| 29 May 2026 | 1 hour 23 minutes | Carrier |
| 29 July 2026 | 1 hour 15 minutes | Extreme weather |
| 5 August 2026 | 1 hour 3 minutes | Carrier |
| 26 July 2026 | 1 hour 2 minutes | Carrier |
Delay causes
Why OO 4234 runs late
Carrier accounts for 74% of the 731 delay minutes carriers reported here, and the remaining four split what is left.
- 74%Carrier
- 20%Extreme weather
- 6%National Airspace System
Extreme weather accounts for 20% 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 3.3 times the usual weather exposure. The split is drawn from 731 delay minutes reported on OO 4234.
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
Badly late arrivals are rare here: only 1.4% 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.
Every one of the 365 flights under OO 4234 in the data flew SLC to GJT. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 365 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 4234
For a booking, OO 4234 has one of the better records a US domestic flight can show: 96.1% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- Salt Lake City International (SLC) 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.