Flight number record
OO 4237
SkyWest Airlines · St. George to Salt Lake City
- Route
- SGU → SLC
- Departs
- 08:50
- Flights
- 282
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4237, 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 4237 earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 17 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 282 flights, with a median arrival 11 minutes early.
Set against the rest of the country, OO 4237's record is 17 points better than the US average of 77.3%. That gap is worth roughly 174 fewer late arrivals for every thousand flights.
Key figures
On time
94.7%
Arrivals under 15 minutes late, of 282 completed flights
Avg delay
96 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
1.8%
National rate is 8.3%
These figures cover 282 flights between September 2025 and August 2026. The median arrival is 11 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 4237 flies
OO 4237 flies SGU to SLC without a single fixed slot. Its most common scheduled departure was 08:50, used on 187 of 282 flights, with 09:00 (59 flights) and 08:55 (36 flights) next.
- Departs 08:50187 flights66.3%
- Departs 09:0059 flights20.9%
- Departs 08:5536 flights12.8%
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 08:50 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 4237 runs 11 points better at 94.7%. 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 4237 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 4237 is 2 points ahead of it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 16 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4237thin sample | 282 | 94.7% | 96 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 4237 quarter by quarter
Quarter by quarter OO 4237 held fairly steady: 96.7% in Jul–Sep 2025, 95.2% in Oct–Dec 2025, 92.9% in Jan–Mar 2026, 96.7% in Apr–Jun 2026 and 91.1% in Jul–Sep 2026. A spread of 6 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 202563 flights95.2%
- Jan–Mar 202642 flights92.9%
- Apr–Jun 202691 flights96.7%
- Jul–Sep 202656 flights91.1%
Scale runs 85% to 100%.
By weekday, OO 4237 did best on Wednesday at 100.0% on time and worst on Saturday at 82.5%. Each day rests on about 40 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4237 runs when it is late
OO 4237 often beats the schedule: 110 of 282 completed flights, 39%, arrived 15 minutes or more early. The 15 late arrivals split 2 under half an hour, 8 between 30 and 60 minutes, and 5 an hour or more.
- 15+ min early110 flights39.0%
- Within 15 min157 flights55.7%
- 15–29 min late2 flights0.7%
- 30–59 min late8 flights2.8%
- 1–2 hours late1 flights0.4%
- 2+ hours late4 flights1.4%
Scale runs 0% to 100%.
Share of 282 completed flights by arrival against schedule.
Only 14 of 282 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 4237
The latest arrival of the period was on 23 May 2026, 6 hours 54 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 23 May 2026 | 6 hours 54 minutes | Carrier |
| 26 September 2025 | 3 hours 53 minutes | Carrier |
| 2 May 2026 | 2 hours 45 minutes | Carrier |
| 10 March 2026 | 2 hours 26 minutes | Carrier |
| 21 February 2026 | 1 hour 9 minutes | Carrier |
Delay causes
Why OO 4237 runs late
Carrier accounts for 95% of the 1,433 delay minutes carriers reported here, and the remaining four split what is left.
- 95%Carrier
- 3%National Airspace System
- 2%Extreme weather
The largest share of delay minutes, 95%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,361 of the 1,433 delay minutes reported here. The split is drawn from 1,433 delay minutes reported on OO 4237.
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 1.8% 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 282 flights under OO 4237 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. 282 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 4237
For a booking, OO 4237 has one of the better records a US domestic flight can show: 94.7% 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 4235 on the same route96.7%
- SkyWest Airlines 4321 on the same route87.3%
- SkyWest Airlines 4253 on the same route93.3%
- SkyWest Airlines 4308 on the same route93.9%
- 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
- How to read this site: grades, sample sizes, and honest caveats
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.