Flight number record

OO 4308

SkyWest Airlines · St. George to Salt Lake City

Route: SGU → SLC
Departs: 11:25
Flights: 296
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4308, 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 4308 earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 16 points better than the national rate of 77.6%. When something does go wrong the average delay runs roughly 55 minutes. That rests on 296 flights, with a median arrival 13 minutes early.

Set against the rest of the country, OO 4308's record is 16 points better than the US average of 77.6%. That gap is worth roughly 159 fewer late arrivals for every thousand flights.

On time

93.5%

Arrivals under 15 minutes late, of 294 completed flights

Avg delay

53 min

Across delayed arrivals only, not all flights

Cancelled

0.68%

National rate is 1.81%

1 hour+ late

1.4%

National rate is 8.1%

These figures cover 296 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 4308 flies

OO 4308 flies SGU to SLC without a single fixed slot. Its most common scheduled departure was 11:25, used on 211 of 296 flights, with 11:30 (54 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 11:25211 flights71.3%
Departs 11:3054 flights18.2%

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 11:25 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and OO 4308 runs 15 points better at 93.5%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 4308 next to SGU to SLC

Every carrier on SGU to SLC combined arrived on time 93.7% of the time across 1,725 flights, so OO 4308 is about level with it. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 15 points.

OO 4308 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4308thin sample	296	93.5%	53 min	0.68%	A+
All SkyWest Airlines on SGU–SLC	1,725	93.7%	69 min	0.17%	A+
All carriers on SGU–SLC	1,725	93.7%	69 min	0.17%	A+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4308 quarter by quarter

Quarter by quarter OO 4308 held fairly steady: 90.6% in Jul–Sep 2025, 98.7% in Oct–Dec 2025, 90.6% in Jan–Mar 2026 and 93.5% in Apr–Jun 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202553 flights90.6%
Oct–Dec 202581 flights98.7%
Jan–Mar 202685 flights90.6%
Apr–Jun 202677 flights93.5%

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

By weekday, OO 4308 ranged from 88.4% on Tuesday to 96.1% on Friday. With about 42 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why OO 4308 runs late

One category carries most of the weight here. Carrier accounts for 63% of the 997 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
63%
National Airspace System
29%
Extreme weather
8%

The largest share of delay minutes, 63%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 631 of the 997 delay minutes reported here. The split is drawn from 997 delay minutes reported on OO 4308.

Cancellations are rare at 0.68%, 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 1.4% 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 4308 is not only a SGU to SLC flight. It also flew SLC to SGU (296 flights, 93.9% 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. 296 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 4308
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
SLC to SGUthin sample	296	93.9%	40 min	0.68%	A+

What to do with this

Booking OO 4308

For a booking, OO 4308 has one of the better records a US domestic flight can show: 93.5% on time and 0.68% 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