Flight number record
OO 4811
SkyWest Airlines · Phoenix to St. George
- Route
- PHX → SGU
- Departs
- 08:35
- Flights
- 360
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4811, 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 4811 lands a B+, 3 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 360 flights, with a median arrival 3 minutes early.
Key figures
On time
80.5%
Arrivals under 15 minutes late, of 359 completed flights
Avg delay
59 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
7.0%
National rate is 8.3%
These figures cover 360 flights between September 2025 and August 2026. The median arrival is 3 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 4811 flies
OO 4811 flies PHX to SGU without a single fixed slot. Its most common scheduled departure was 08:35, used on 47 of 360 flights, with 08:54 (44 flights) and 08:45 (37 flights) next.
- Departs 08:3547 flights13.1%
- Departs 08:5444 flights12.2%
- Departs 08:4537 flights10.3%
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 08:35 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 4811 runs 3 points worse at 80.5%. 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 4811 next to PHX to SGU
Every carrier on PHX to SGU combined arrived on time 83.1% of the time across 889 flights, so OO 4811 is 3 points behind it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4811thin sample | 360 | 80.5% | 59 min | 0.00% | B+ |
| All SkyWest Airlines on PHX–SGU | 889 | 83.1% | 78 min | 0.11% | B+ |
| All carriers on PHX–SGU | 889 | 83.1% | 78 min | 0.11% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4811 quarter by quarter
Quarter by quarter OO 4811 held fairly steady: 80.0% in Jul–Sep 2025, 78.3% in Oct–Dec 2025, 84.4% in Jan–Mar 2026, 80.0% in Apr–Jun 2026 and 78.9% 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 flights80.0%
- Oct–Dec 202592 flights78.3%
- Jan–Mar 202690 flights84.4%
- Apr–Jun 202691 flights80.0%
- Jul–Sep 202657 flights78.9%
Scale runs 70% to 90%.
By weekday, OO 4811 ranged from 76.5% on Saturday to 86.3% on Sunday. With about 51 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 4811 runs when it is late
The 70 late arrivals split 30 under half an hour, 15 between 30 and 60 minutes, and 25 an hour or more.
- 15+ min early62 flights17.3%
- Within 15 min227 flights63.2%
- 15–29 min late30 flights8.4%
- 30–59 min late15 flights4.2%
- 1–2 hours late15 flights4.2%
- 2+ hours late10 flights2.8%
Scale runs 0% to 100%.
Share of 359 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 48 departures that left 15 minutes late or more, only 0 made it up before arrival. In the other direction, 22 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 SGU.
The worst days
Worst days for OO 4811
The latest arrival of the period was on 3 November 2025, 4 hours 38 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 3 November 2025 | 4 hours 38 minutes | Carrier |
| 7 January 2026 | 3 hours 40 minutes | Extreme weather |
| 9 October 2025 | 3 hours 38 minutes | Carrier |
| 8 October 2025 | 3 hours 7 minutes | Carrier |
| 18 February 2026 | 2 hours 34 minutes | Extreme weather |
Delay causes
Why OO 4811 runs late
Carrier accounts for 50% of the 4,118 delay minutes carriers reported here, and the remaining four split what is left.
- 50%Carrier
- 25%Late-arriving aircraft
- 13%Extreme weather
- 12%National Airspace System
- 0%Security
Extreme weather accounts for 13% 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 2.1 times the usual weather exposure. The split is drawn from 4,118 delay minutes reported on OO 4811.
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
7.0% 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 about an hour, which a normal layover absorbs.
Every one of the 360 flights under OO 4811 in the data flew PHX to SGU. 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. 360 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 4811
For a booking, read OO 4811 as 80.5% on time with 0.00% cancelled over 360 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- PHX to SGU, every carrier and departure
- SGU to PHX, the return direction
- SkyWest Airlines 4815 on the same route87.4%
- SkyWest Airlines 4813 on the same route82.2%
- 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.