Flight number record

OO 4237

SkyWest Airlines · St. George to Salt Lake City

Route: SGU → SLC
Departs: 08:50
Flights: 288
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4237, 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 4237 earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 18 points better than the national rate of 77.6%. When something does go wrong the average delay runs close to two hours. That rests on 288 flights, with a median arrival 11 minutes early.

Set against the rest of the country, OO 4237's record is 18 points better than the US average of 77.6%. That gap is worth roughly 175 fewer late arrivals for every thousand flights.

On time

95.1%

Arrivals under 15 minutes late, of 288 completed flights

Avg delay

107 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

1 hour+ late

2.4%

National rate is 8.1%

These figures cover 288 flights between July 2025 and June 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.

Schedule

When OO 4237 flies

OO 4237 flies SGU to SLC without a single fixed slot. Its most common scheduled departure was 08:50, used on 131 of 288 flights, with 09:00 (121 flights) and 08:55 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 08:50131 flights45.5%
Departs 09:00121 flights42.0%
Departs 08:5536 flights12.5%

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 08:50 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and OO 4237 runs 11 points better at 95.1%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

OO 4237 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 4237 is about level with it. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 16 points.

OO 4237 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4237thin sample	288	95.1%	107 min	0.00%	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 4237 quarter by quarter

Quarter by quarter OO 4237 held fairly steady: 94.6% in Jul–Sep 2025, 95.2% in Oct–Dec 2025, 92.9% in Jan–Mar 2026 and 96.7% in Apr–Jun 2026. A spread of 4 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights94.6%
Oct–Dec 202563 flights95.2%
Jan–Mar 202642 flights92.9%
Apr–Jun 202691 flights96.7%

Scale runs 85% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4237 did best on Monday at 100.0% on time and worst on Saturday at 82.9%. Each day rests on about 41 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 4237 runs late

One category carries most of the weight here. Carrier accounts for 98% of the 1,503 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
98%
National Airspace System
2%

The largest share of delay minutes, 98%, 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 1,470 of the 1,503 delay minutes reported here. The split is drawn from 1,503 delay minutes reported on OO 4237.

Cancellations are rare at 0.00%, below the national 1.81% 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 2.4% 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.

Every one of the 288 flights under OO 4237 in the data flew SGU to SLC. 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. 288 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 4237

For a booking, OO 4237 has one of the better records a US domestic flight can show: 95.1% on time and 0.00% 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