Flight number record

OO 4815

SkyWest Airlines · Phoenix to St. George

Route: PHX → SGU
Departs: 20:00
Flights: 265
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 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+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 10 points better than the national rate of 77.3%. When something does go wrong the average delay runs close to two hours. That rests on 265 flights, with a median arrival 9 minutes early.

Set against the rest of the country, OO 4815's record is 10 points better than the US average of 77.3%. That gap is worth roughly 101 fewer late arrivals for every thousand flights.

On time

87.4%

Arrivals under 15 minutes late, of 262 completed flights

Avg delay

118 min

Across delayed arrivals only, not all flights

Cancelled

0.38%

National rate is 1.89%

1 hour+ late

4.6%

National rate is 8.3%

These figures cover 265 flights between September 2025 and August 2026. The median arrival is 9 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.

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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 265 flights, with 21:45 (43 flights) and 22:06 (30 flights) next.

Departs 20:0046 flights17.4%
Departs 21:4543 flights16.2%
Departs 22:0630 flights11.3%

Scale runs 0% to 100%.

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 70.1%, and OO 4815 runs 17 points better at 87.4%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

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Against the route

OO 4815 next to PHX to SGU

Every carrier on PHX to SGU combined arrived on time 83.1% of the time across 889 flights, so OO 4815 is 4 points ahead of it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 9 points.

OO 4815 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4815thin sample	265	87.4%	118 min	0.38%	A+
All SkyWest Airlines on PHX–SGU	889	83.1%	78 min	0.11%	B+
All carriers on PHX–SGU	889	83.1%	78 min	0.11%	B+
SkyWest Airlines, whole network	855,406	78.7%	88 min	1.79%	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 88 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 202513 flights—
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 81.1% on Friday to 90.9% on Tuesday. With about 38 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.

Arrival by arrival

How late OO 4815 runs when it is late

OO 4815 often beats the schedule: 71 of 262 completed flights, 27%, arrived 15 minutes or more early. The 33 late arrivals split 7 under half an hour, 14 between 30 and 60 minutes, and 12 an hour or more.

15+ min early71 flights27.1%
Within 15 min158 flights60.3%
15–29 min late7 flights2.7%
30–59 min late14 flights5.3%
1–2 hours late6 flights2.3%
2+ hours late6 flights2.3%

Scale runs 0% to 100%.

Share of 262 completed flights by arrival against schedule.

7 of 39 late departures made up the time and arrived on time, 18% of them. Only 1 left on time and still arrived late.

The worst days

Worst days for OO 4815

The latest arrival of the period was on 6 March 2026, 10 hours 15 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.

The latest arrivals of OO 4815 in the period
Date	Arrived late by	Largest filed cause
6 March 2026	10 hours 15 minutes	Carrier
29 April 2026	10 hours 2 minutes	Carrier
25 April 2026	9 hours 39 minutes	Carrier
20 February 2026	9 hours 2 minutes	Carrier
12 March 2026	2 hours 55 minutes	Late-arriving aircraft

Delay causes

Why OO 4815 runs late

Carrier accounts for 70% of the 3,893 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
70%
Late-arriving aircraft
19%
National Airspace System
12%

The largest share of delay minutes, 70%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,706 of the 3,893 delay minutes reported here. The split is drawn from 3,893 delay minutes reported on OO 4815.

Cancellations are rare at 0.38%, below the national 1.89% 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 4.6% land an hour or more behind schedule, against 8.3% 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 265 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. 265 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: 87.4% 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures