Flight number record
OO 4235
SkyWest Airlines · St. George to Salt Lake City
- Route
- SGU → SLC
- Departs
- 05:50
- Flights
- 359
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4235, 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 4235 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 about 2.2 hours. That rests on 359 flights, with a median arrival 15 minutes early.
Set against the rest of the country, OO 4235's record is 19 points better than the US average of 77.3%. That gap is worth roughly 194 fewer late arrivals for every thousand flights.
Key figures
On time
96.7%
Arrivals under 15 minutes late, of 359 completed flights
Avg delay
129 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
1.9%
National rate is 8.3%
These figures cover 359 flights between September 2025 and August 2026. The median arrival is 15 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 4235 flies
OO 4235 flies SGU to SLC without a single fixed slot. Its most common scheduled departure was 05:50, used on 200 of 359 flights, with 06:00 (124 flights) next.
- Departs 05:50200 flights55.7%
- Departs 06:00124 flights34.5%
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 05:50 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 4235 runs 7 points better at 96.7%. 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 4235 next to SGU to SLC
Every carrier on SGU to SLC combined arrived on time 93.0% of the time across 1,727 flights, so OO 4235 is 4 points ahead of it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 18 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4235thin sample | 359 | 96.7% | 129 min | 0.00% | A+ |
| All SkyWest Airlines on SGU–SLC | 1,727 | 93.0% | 69 min | 0.17% | A+ |
| All carriers on SGU–SLC | 1,727 | 93.0% | 69 min | 0.17% | A+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4235 quarter by quarter
Quarter by quarter OO 4235 held fairly steady: 96.7% in Jul–Sep 2025, 97.8% in Oct–Dec 2025, 95.6% in Jan–Mar 2026, 100.0% in Apr–Jun 2026 and 91.1% in Jul–Sep 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights96.7%
- Oct–Dec 202592 flights97.8%
- Jan–Mar 202690 flights95.6%
- Apr–Jun 202691 flights100.0%
- Jul–Sep 202656 flights91.1%
Scale runs 85% to 100%.
By weekday, OO 4235 ranged from 94.1% on Sunday to 100.0% on Wednesday. With about 51 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 4235 runs when it is late
OO 4235 often beats the schedule: 186 of 359 completed flights, 52%, arrived 15 minutes or more early. When OO 4235 is late it tends to be very late: 7 of its 12 late arrivals were an hour or more behind, and 5 were two hours or more.
- 15+ min early186 flights51.8%
- Within 15 min161 flights44.8%
- 15–29 min late3 flights0.8%
- 30–59 min late2 flights0.6%
- 1–2 hours late2 flights0.6%
- 2+ hours late5 flights1.4%
Scale runs 0% to 100%.
Share of 359 completed flights by arrival against schedule.
Only 11 of 359 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 4235
The latest arrival of the period was on 17 March 2026, 5 hours 27 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 |
|---|---|---|
| 17 March 2026 | 5 hours 27 minutes | Carrier |
| 17 January 2026 | 5 hours 4 minutes | Carrier |
| 12 July 2026 | 4 hours 24 minutes | Carrier |
| 31 August 2026 | 3 hours 14 minutes | Carrier |
| 28 August 2026 | 2 hours 44 minutes | Extreme weather |
Delay causes
Why OO 4235 runs late
Carrier accounts for 88% of the 1,553 delay minutes carriers reported here, and the remaining four split what is left.
- 88%Carrier
- 11%Extreme weather
- 1%National Airspace System
The largest share of delay minutes, 88%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,373 of the 1,553 delay minutes reported here. The split is drawn from 1,553 delay minutes reported on OO 4235.
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 1.9% 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.
Every one of the 359 flights under OO 4235 in the data flew SGU to SLC. 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. 359 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 4235
For a booking, OO 4235 has one of the better records a US domestic flight can show: 96.7% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- SGU to SLC, every carrier and departure
- SLC to SGU, the return direction
- SkyWest Airlines 4321 on the same route87.3%
- SkyWest Airlines 4253 on the same route93.3%
- SkyWest Airlines 4308 on the same route93.9%
- SkyWest Airlines 4237 on the same route94.7%
- 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.