Flight number record

OO 4815

SkyWest Airlines · Phoenix to St. George

Route: PHX → SGU
Departs: 20:00
Flights: 327
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4815, 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 4815 earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 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 327 flights, with a median arrival 8 minutes early.

Set against the rest of the country, OO 4815's record is 8 points better than the US average of 77.6%. That gap is worth roughly 82 fewer late arrivals for every thousand flights.

On time

85.8%

Arrivals under 15 minutes late, of 324 completed flights

Avg delay

117 min

Across delayed arrivals only, not all flights

Cancelled

0.31%

National rate is 1.81%

1 hour+ late

5.9%

National rate is 8.1%

These figures cover 327 flights between July 2025 and June 2026. The median arrival is 8 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 4815 flies

OO 4815 flies PHX to SGU without a single fixed slot. Its most common scheduled departure was 20:00, used on 46 of 327 flights, with 21:45 (43 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 20:0046 flights14.1%
Departs 21:4543 flights13.1%

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 20:00 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and OO 4815 runs 15 points better at 85.8%. 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 4815 next to PHX to SGU

Every carrier on PHX to SGU combined arrived on time 83.9% of the time across 900 flights, so OO 4815 is 2 points ahead of it. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 7 points.

OO 4815 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4815thin sample	327	85.8%	117 min	0.31%	A+
All SkyWest Airlines on PHX–SGU	900	83.9%	83 min	0.11%	B+
All carriers on PHX–SGU	900	83.9%	83 min	0.11%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4815 quarter by quarter

OO 4815 did not run the same all year. Its best quarter was Oct–Dec 2025 at 95.5% on time and its weakest Jan–Mar 2026 at 80.7%, a swing of 15 points on roughly 82 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 202575 flights81.3%
Oct–Dec 202588 flights95.5%
Jan–Mar 202690 flights80.7%
Apr–Jun 202674 flights84.9%

Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4815 ranged from 81.6% on Thursday to 92.9% on Tuesday. With about 47 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why OO 4815 runs late

One category carries most of the weight here. Carrier accounts for 72% of the 5,363 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
72%
Late-arriving aircraft
15%
National Airspace System
12%
Extreme weather
1%

The largest share of delay minutes, 72%, 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 3,839 of the 5,363 delay minutes reported here. The split is drawn from 5,363 delay minutes reported on OO 4815.

Cancellations are rare at 0.31%, 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

5.9% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last close to two hours, which a normal layover absorbs.

Every one of the 327 flights under OO 4815 in the data flew PHX to SGU. 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. 327 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 4815

For a booking, OO 4815 has one of the better records a US domestic flight can show: 85.8% on time and 0.31% 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