Flight number record
OO 4310
SkyWest Airlines · Cedar City to Salt Lake City
- Route
- CDC → SLC
- Departs
- 18:50
- Flights
- 272
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4310, 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 4310 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 3.3 hours. That rests on 272 flights, with a median arrival 14 minutes early.
Set against the rest of the country, OO 4310's record is 15 points better than the US average of 77.3%. That gap is worth roughly 153 fewer late arrivals for every thousand flights.
Key figures
On time
92.6%
Arrivals under 15 minutes late, of 271 completed flights
Avg delay
196 min
Across delayed arrivals only, not all flights
Cancelled
0.37%
National rate is 1.89%
1 hour+ late
4.1%
National rate is 8.3%
These figures cover 272 flights between September 2025 and August 2026. The median arrival is 14 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 4310 flies
OO 4310 flies CDC to SLC without a single fixed slot. Its most common scheduled departure was 18:50, used on 86 of 272 flights, with 19:00 (85 flights) and 18:55 (37 flights) next.
- Departs 18:5086 flights31.6%
- Departs 19:0085 flights31.3%
- Departs 18:5537 flights13.6%
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 18:50 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and OO 4310 runs 25 points better at 92.6%. 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 4310 next to CDC to SLC
Every carrier on CDC to SLC combined arrived on time 94.6% of the time across 631 flights, so OO 4310 is 2 points behind 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 4310thin sample | 272 | 92.6% | 196 min | 0.37% | A+ |
| All SkyWest Airlines on CDC–SLC | 631 | 94.6% | 139 min | 0.48% | A+ |
| All carriers on CDC–SLC | 631 | 94.6% | 139 min | 0.48% | A+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4310 quarter by quarter
OO 4310 did not run the same all year. Its best quarter was Oct–Dec 2025 at 97.0% on time and its weakest Apr–Jun 2026 at 86.6%, a swing of 10 points on roughly 68 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 202523 flights—
- Oct–Dec 202568 flights97.0%
- Jan–Mar 202665 flights95.4%
- Apr–Jun 202667 flights86.6%
- Jul–Sep 202649 flights95.9%
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, OO 4310 ranged from 88.5% on Monday to 100.0% on Saturday. With about 39 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 4310 runs when it is late
OO 4310 often beats the schedule: 133 of 271 completed flights, 49%, arrived 15 minutes or more early. When OO 4310 is late it tends to be very late: 11 of its 20 late arrivals were an hour or more behind, and 5 were two hours or more.
- 15+ min early133 flights49.1%
- Within 15 min118 flights43.5%
- 15–29 min late7 flights2.6%
- 30–59 min late2 flights0.7%
- 1–2 hours late6 flights2.2%
- 2+ hours late5 flights1.8%
Scale runs 0% to 100%.
Share of 271 completed flights by arrival against schedule.
Only 13 of 271 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 4310
The latest arrival of the period was on 17 May 2026, 17 hours 39 minutes behind schedule; most of its delay minutes were filed as extreme weather. Three of the five worst days fell in May 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 17 May 2026 | 17 hours 39 minutes | Extreme weather |
| 1 May 2026 | 15 hours 41 minutes | Carrier |
| 12 March 2026 | 14 hours 12 minutes | Carrier |
| 25 June 2026 | 2 hours 49 minutes | Extreme weather |
| 29 May 2026 | 2 hours 12 minutes | Carrier |
Delay causes
Why OO 4310 runs late
Carrier accounts for 65% of the 3,911 delay minutes carriers reported here, and the remaining four split what is left.
- 65%Carrier
- 35%Extreme weather
Extreme weather accounts for 35% 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 5.8 times the usual weather exposure. The split is drawn from 3,911 delay minutes reported on OO 4310.
Cancellations are rare at 0.37%, 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 4.1% 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 4310 is not only a CDC to SLC flight. It also flew SLC to CDC (272 flights, 95.2% 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. 272 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 CDCthin sample | 272 | 95.2% | 85 min | 0.37% | A+ |
What to do with this
Booking OO 4310
For a booking, OO 4310 has one of the better records a US domestic flight can show: 92.6% on time and 0.37% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- 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
- Late aircraft, weather, or the airline: what actually causes US flight delays
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.