Flight number record
OO 4812
SkyWest Airlines · St. George to Phoenix
- Route
- SGU → PHX
- Departs
- 12:15
- Flights
- 295
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4812, 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 4812 lands a B+, level with the national rate of 77.3%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 295 flights, with a median arrival 5 minutes early.
Key figures
On time
77.6%
Arrivals under 15 minutes late, of 295 completed flights
Avg delay
85 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
7.5%
National rate is 8.3%
These figures cover 295 flights between September 2025 and August 2026. The median arrival is 5 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 4812 flies
OO 4812 flies SGU to PHX without a single fixed slot. Its most common scheduled departure was 12:15, used on 155 of 295 flights, with 11:23 (37 flights) and 11:33 (30 flights) next.
- Departs 12:15155 flights52.5%
- Departs 11:2337 flights12.5%
- Departs 11:3330 flights10.2%
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 12:15 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 4812 runs level with that at 77.6%. 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 4812 next to SGU to PHX
Every carrier on SGU to PHX combined arrived on time 82.5% of the time across 889 flights, so OO 4812 is 5 points behind it. Across its whole network SkyWest Airlines managed 78.7%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4812thin sample | 295 | 77.6% | 85 min | 0.00% | B+ |
| All SkyWest Airlines on SGU–PHX | 889 | 82.5% | 85 min | 0.11% | B+ |
| All carriers on SGU–PHX | 889 | 82.5% | 85 min | 0.11% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4812 quarter by quarter
OO 4812 did not run the same all year. Its best quarter was Oct–Dec 2025 at 86.2% on time and its weakest Apr–Jun 2026 at 73.6%, a swing of 13 points on roughly 74 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.
- Oct–Dec 202558 flights86.2%
- Jan–Mar 202690 flights76.7%
- Apr–Jun 202691 flights73.6%
- Jul–Sep 202656 flights76.8%
Scale runs 65% to 90%.
By weekday, OO 4812 did best on Wednesday at 85.0% on time and worst on Sunday at 70.5%. Each day rests on about 42 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4812 runs when it is late
OO 4812 often beats the schedule: 81 of 295 completed flights, 27%, arrived 15 minutes or more early. The 66 late arrivals split 22 under half an hour, 22 between 30 and 60 minutes, and 22 an hour or more.
- 15+ min early81 flights27.5%
- Within 15 min148 flights50.2%
- 15–29 min late22 flights7.5%
- 30–59 min late22 flights7.5%
- 1–2 hours late9 flights3.1%
- 2+ hours late13 flights4.4%
Scale runs 0% to 100%.
Share of 295 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 53 departures that left 15 minutes late or more, only 5 made it up before arrival. In the other direction, 18 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 PHX.
The worst days
Worst days for OO 4812
The latest arrival of the period was on 7 December 2025, 12 hours 17 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Four of the five worst days fell in January 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 December 2025 | 12 hours 17 minutes | Carrier |
| 25 January 2026 | 8 hours 32 minutes | Extreme weather |
| 15 January 2026 | 4 hours 9 minutes | Carrier |
| 7 January 2026 | 4 hours 2 minutes | Extreme weather |
| 27 January 2026 | 4 hours 2 minutes | Carrier |
Delay causes
Why OO 4812 runs late
Carrier accounts for 56% of the 5,634 delay minutes carriers reported here, and the remaining four split what is left.
- 56%Carrier
- 18%Extreme weather
- 14%National Airspace System
- 12%Late-arriving aircraft
Extreme weather accounts for 18% 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 2.9 times the usual weather exposure. The split is drawn from 5,634 delay minutes reported on OO 4812.
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
7.5% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last an hour and a half, which a normal layover absorbs.
Every one of the 295 flights under OO 4812 in the data flew SGU to PHX. 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. 295 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 4812
For a booking, read OO 4812 as 77.6% on time with 0.00% cancelled over 295 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SGU to PHX, every carrier and departure
- PHX to SGU, the return direction
- SkyWest Airlines 4810 on the same route87.7%
- Phoenix Sky Harbor International (PHX) 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.