Flight number record

OO 4253

SkyWest Airlines · Salt Lake City to St. George

Route: SLC → SGU
Departs: 11:20
Flights: 350
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4253, 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 4253 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 45 minutes. That rests on 350 flights, with a median arrival 13 minutes early.

Set against the rest of the country, OO 4253's record is 16 points better than the US average of 77.6%. That gap is worth roughly 164 fewer late arrivals for every thousand flights.

On time

94.0%

Arrivals under 15 minutes late, of 349 completed flights

Avg delay

47 min

Across delayed arrivals only, not all flights

Cancelled

0.29%

National rate is 1.81%

1 hour+ late

1.7%

National rate is 8.1%

These figures cover 350 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 4253 flies

OO 4253 flies SLC to SGU without a single fixed slot. Its most common scheduled departure was 11:20, used on 177 of 350 flights, with 17:20 (63 flights) and 11:15 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 11:20177 flights50.6%
Departs 17:2063 flights18.0%
Departs 11:1536 flights10.3%

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 11:20 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and OO 4253 runs 15 points better at 94.0%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 4253 next to SLC to SGU

Every carrier on SLC to SGU combined arrived on time 92.1% of the time across 1,725 flights, so OO 4253 is 2 points ahead of it. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 15 points.

OO 4253 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4253thin sample	350	94.0%	47 min	0.29%	A+
All SkyWest Airlines on SLC–SGU	1,725	92.1%	71 min	0.17%	A+
All carriers on SLC–SGU	1,725	92.1%	71 min	0.17%	A+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4253 quarter by quarter

Quarter by quarter OO 4253 held fairly steady: 95.7% in Jul–Sep 2025, 95.5% in Oct–Dec 2025, 95.4% in Jan–Mar 2026 and 89.0% in Apr–Jun 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights95.7%
Oct–Dec 202589 flights95.5%
Jan–Mar 202687 flights95.4%
Apr–Jun 202682 flights89.0%

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

By weekday, OO 4253 ranged from 89.8% on Saturday to 98.1% on Tuesday. With about 50 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 4253 runs late

One category carries most of the weight here. Carrier accounts for 89% of the 986 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
89%
National Airspace System
7%
Extreme weather
4%

The largest share of delay minutes, 89%, 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 877 of the 986 delay minutes reported here. The split is drawn from 986 delay minutes reported on OO 4253.

Cancellations are rare at 0.29%, 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 1.7% 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 4253 is not only a SLC to SGU flight. It also flew SGU to SLC (349 flights, 94.3% 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. 350 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 4253
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
SGU to SLCthin sample	349	94.3%	46 min	0.29%	A+

What to do with this

Booking OO 4253

For a booking, OO 4253 has one of the better records a US domestic flight can show: 94.0% on time and 0.29% 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