Flight number record
OO 4279
SkyWest Airlines · Salt Lake City to St. George
- Route
- SLC → SGU
- Departs
- 20:45
- Flights
- 357
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4279, 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 4279 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 15 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 2.1 hours. That rests on 357 flights, with a median arrival 11 minutes early.
Set against the rest of the country, OO 4279's record is 15 points better than the US average of 77.3%. That gap is worth roughly 149 fewer late arrivals for every thousand flights.
Key figures
On time
92.2%
Arrivals under 15 minutes late, of 357 completed flights
Avg delay
128 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
2.5%
National rate is 8.3%
These figures cover 357 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 4279 flies
OO 4279 flies SLC to SGU without a single fixed slot. Its most common scheduled departure was 20:45, used on 251 of 357 flights, with 22:45 (105 flights) next.
- Departs 20:45251 flights70.3%
- Departs 22:45105 flights29.4%
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 20:45 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and OO 4279 runs 22 points better at 92.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
OO 4279 next to SLC to SGU
Every carrier on SLC to SGU combined arrived on time 91.4% of the time across 1,727 flights, so OO 4279 is about level with it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4279thin sample | 357 | 92.2% | 128 min | 0.00% | A+ |
| All SkyWest Airlines on SLC–SGU | 1,727 | 91.4% | 81 min | 0.17% | A+ |
| All carriers on SLC–SGU | 1,727 | 91.4% | 81 min | 0.17% | A+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4279 quarter by quarter
OO 4279 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Jul–Sep 2026 at 82.1%, a swing of 15 points on roughly 71 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.
- Jul–Sep 202530 flights96.7%
- Oct–Dec 202590 flights94.4%
- Jan–Mar 202690 flights90.0%
- Apr–Jun 202691 flights96.7%
- Jul–Sep 202656 flights82.1%
Scale runs 75% to 100%.
By weekday, OO 4279 ranged from 88.0% on Thursday to 98.0% on Wednesday. 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 4279 runs when it is late
OO 4279 often beats the schedule: 144 of 357 completed flights, 40%, arrived 15 minutes or more early. The 28 late arrivals split 11 under half an hour, 8 between 30 and 60 minutes, and 9 an hour or more.
- 15+ min early144 flights40.3%
- Within 15 min185 flights51.8%
- 15–29 min late11 flights3.1%
- 30–59 min late8 flights2.2%
- 1–2 hours late3 flights0.8%
- 2+ hours late6 flights1.7%
Scale runs 0% to 100%.
Share of 357 completed flights by arrival against schedule.
6 of 30 late departures made up the time and arrived on time, 20% of them. Only 4 left on time and still arrived late.
The worst days
Worst days for OO 4279
The latest arrival of the period was on 16 March 2026, 12 hours 57 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 |
|---|---|---|
| 16 March 2026 | 12 hours 57 minutes | Carrier |
| 27 August 2026 | 10 hours 4 minutes | Extreme weather |
| 18 January 2026 | 9 hours 16 minutes | Carrier |
| 7 August 2026 | 9 hours | Carrier |
| 13 October 2025 | 2 hours 33 minutes | Carrier |
Delay causes
Why OO 4279 runs late
Carrier accounts for 78% of the 3,575 delay minutes carriers reported here, and the remaining four split what is left.
- 78%Carrier
- 21%Extreme weather
- 1%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 3.5 times the usual weather exposure. The split is drawn from 3,575 delay minutes reported on OO 4279.
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 2.5% 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 357 flights under OO 4279 in the data flew SLC 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. 357 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 4279
For a booking, OO 4279 has one of the better records a US domestic flight can show: 92.2% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- SLC to SGU, every carrier and departure
- SGU to SLC, the return direction
- SkyWest Airlines 4321 on the same route92.1%
- SkyWest Airlines 4253 on the same route93.6%
- SkyWest Airlines 4308 on the same route94.2%
- SkyWest Airlines 4263 on the same route84.0%
- 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.