Flight number record

OO 4310

SkyWest Airlines · Salt Lake City to Cedar City

Route: SLC → CDC
Departs: 17:10
Flights: 266
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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+. 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 77.6%. When something does go wrong the average delay runs an hour and a half. That rests on 266 flights, with a median arrival 13 minutes early.

Set against the rest of the country, OO 4310's record is 17 points better than the US average of 77.6%. That gap is worth roughly 171 fewer late arrivals for every thousand flights.

On time

94.7%

Arrivals under 15 minutes late, of 264 completed flights

Avg delay

87 min

Across delayed arrivals only, not all flights

Cancelled

0.38%

National rate is 1.81%

1 hour+ late

3.0%

National rate is 8.1%

These figures cover 266 flights between July 2025 and June 2026. The median arrival is 13 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.

Schedule

When OO 4310 flies

OO 4310 is scheduled to leave Salt Lake City (SLC) at 17:10 local time and reach Cedar City (CDC) at 18:15. That slot held for 226 of the 266 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.

Departs 17:10226 flights85.0%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 17:10 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and OO 4310 runs 27 points better at 94.7%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

OO 4310 next to SLC to CDC

Every carrier on SLC to CDC combined arrived on time 94.9% of the time across 627 flights, so OO 4310 is about level with it. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 16 points.

OO 4310 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4310thin sample	266	94.7%	87 min	0.38%	A+
All SkyWest Airlines on SLC–CDC	627	94.9%	69 min	0.48%	A+
All carriers on SLC–CDC	627	94.9%	69 min	0.48%	A+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4310 quarter by quarter

Quarter by quarter OO 4310 held fairly steady: 93.9% in Jul–Sep 2025, 97.0% in Oct–Dec 2025, 98.5% in Jan–Mar 2026 and 89.4% in Apr–Jun 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202566 flights93.9%
Oct–Dec 202568 flights97.0%
Jan–Mar 202665 flights98.5%
Apr–Jun 202667 flights89.4%

Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.

Delay causes

Why OO 4310 runs late

One category carries most of the weight here. Carrier accounts for 69% of the 1,215 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Carrier
69%
Extreme weather
30%
National Airspace System
0%

Extreme weather accounts for 30% 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 4.9 times the usual weather exposure. The split is drawn from 1,215 delay minutes reported on OO 4310.

Cancellations are rare at 0.38%, below the national 1.81% 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 3.0% land an hour or more behind schedule, against 8.1% 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 SLC to CDC flight. It also flew CDC to SLC (266 flights, 89.8% 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. 266 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.

Other routes flown as OO 4310
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
CDC to SLCthin sample	266	89.8%	152 min	0.38%	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: 94.7% on time and 0.38% cancelled. That is a base rate, not a promise about any single day.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures