Flight number record
OO 4253
SkyWest Airlines · St. George to Salt Lake City
- Route
- SGU → SLC
- Departs
- 13:10
- Flights
- 345
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4253, 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 4253 earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 16 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 50 minutes. That rests on 345 flights, with a median arrival 16 minutes early.
Set against the rest of the country, OO 4253's record is 16 points better than the US average of 77.3%. That gap is worth roughly 160 fewer late arrivals for every thousand flights.
Key figures
On time
93.3%
Arrivals under 15 minutes late, of 344 completed flights
Avg delay
49 min
Across delayed arrivals only, not all flights
Cancelled
0.29%
National rate is 1.89%
1 hour+ late
2.0%
National rate is 8.3%
These figures cover 345 flights between September 2025 and August 2026. The median arrival is 16 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 4253 flies
OO 4253 flies SGU to SLC without a single fixed slot. Its most common scheduled departure was 13:10, used on 147 of 345 flights, with 13:15 (76 flights) and 19:10 (38 flights) next.
- Departs 13:10147 flights42.6%
- Departs 13:1576 flights22.0%
- Departs 19:1038 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 13:10 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 4253 runs 15 points better at 93.3%. 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 4253 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 4253 is about level with it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 15 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4253thin sample | 345 | 93.3% | 49 min | 0.29% | 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 4253 quarter by quarter
Quarter by quarter OO 4253 held fairly steady: 93.3% in Jul–Sep 2025, 96.6% in Oct–Dec 2025, 96.6% in Jan–Mar 2026, 87.8% in Apr–Jun 2026 and 91.2% 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 flights93.3%
- Oct–Dec 202589 flights96.6%
- Jan–Mar 202687 flights96.6%
- Apr–Jun 202682 flights87.8%
- Jul–Sep 202657 flights91.2%
Scale runs 80% to 100%.
By weekday, OO 4253 ranged from 90.0% on Sunday to 94.2% on Monday. With about 49 flights behind each day, a spread of 4 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 4253 runs when it is late
OO 4253 often beats the schedule: 180 of 344 completed flights, 52%, arrived 15 minutes or more early. The 23 late arrivals split 7 under half an hour, 9 between 30 and 60 minutes, and 7 an hour or more. Not one arrived two hours late.
- 15+ min early180 flights52.3%
- Within 15 min141 flights41.0%
- 15–29 min late7 flights2.0%
- 30–59 min late9 flights2.6%
- 1–2 hours late7 flights2.0%
- 2+ hours late0 flights0.0%
Scale runs 0% to 100%.
Share of 344 completed flights by arrival against schedule.
4 of 22 late departures made up the time and arrived on time, 18% of them. Only 5 left on time and still arrived late.
The worst days
Worst days for OO 4253
The latest arrival of the period was on 24 June 2026, 1 hour 36 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 |
|---|---|---|
| 24 June 2026 | 1 hour 36 minutes | Carrier |
| 15 April 2026 | 1 hour 31 minutes | Carrier |
| 16 September 2025 | 1 hour 27 minutes | Extreme weather |
| 31 August 2026 | 1 hour 27 minutes | Carrier |
| 30 August 2026 | 1 hour 26 minutes | Carrier |
Delay causes
Why OO 4253 runs late
Carrier accounts for 74% of the 1,127 delay minutes carriers reported here, and the remaining four split what is left.
- 74%Carrier
- 21%Extreme weather
- 4%National Airspace System
Extreme weather accounts for 21% 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 3.6 times the usual weather exposure. The split is drawn from 1,127 delay minutes reported on OO 4253.
Cancellations are rare at 0.29%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is 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 2.0% 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.
OO 4253 is not only a SGU to SLC flight. It also flew SLC to SGU (345 flights, 93.6% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
One caution: this is a thin sample. 345 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SLC to SGUthin sample | 345 | 93.6% | 48 min | 0.29% | A+ |
What to do with this
Booking OO 4253
For a booking, OO 4253 has one of the better records a US domestic flight can show: 93.3% on time and 0.29% 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 4235 on the same route96.7%
- SkyWest Airlines 4321 on the same route87.3%
- 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.