Flight number record

OO 3951

SkyWest Airlines · Los Angeles to Phoenix

Route: LAX → PHX
Departs: 10:00
Flights: 302
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 3951, 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 3951 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 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 302 flights, with a median arrival 8 minutes early.

Set against the rest of the country, OO 3951's record is 10 points better than the US average of 77.6%. That gap is worth roughly 98 fewer late arrivals for every thousand flights.

On time

87.4%

Arrivals under 15 minutes late, of 301 completed flights

Avg delay

77 min

Across delayed arrivals only, not all flights

Cancelled

0.33%

National rate is 1.81%

1 hour+ late

4.7%

National rate is 8.1%

These figures cover 302 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 3951 flies

OO 3951 flies LAX to PHX without a single fixed slot. Its most common scheduled departure was 10:00, used on 106 of 302 flights, with 10:05 (60 flights) and 10:01 (44 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 10:00106 flights35.1%
Departs 10:0560 flights19.9%
Departs 10:0144 flights14.6%

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 10:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and OO 3951 runs 3 points better at 87.4%. 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 3951 next to LAX to PHX

Every carrier on LAX to PHX combined arrived on time 80.9% of the time across 7,608 flights, so OO 3951 is 7 points ahead of it. SkyWest flew 2,590 flights on the same city pair under all its flight numbers, including this one, and those ran 87.2% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 8 points.

OO 3951 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3951thin sample	302	87.4%	77 min	0.33%	A+
All SkyWest Airlines on LAX–PHX	2,590	87.2%	59 min	0.73%	A+
All carriers on LAX–PHX	7,608	80.9%	67 min	0.80%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 3951 quarter by quarter

OO 3951 did not run the same all year. Its best quarter was Jul–Sep 2025 at 92.4% on time and its weakest Jan–Mar 2026 at 80.0%, a swing of 12 points on roughly 76 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 202592 flights92.4%
Oct–Dec 202578 flights88.3%
Jan–Mar 202645 flights80.0%
Apr–Jun 202687 flights85.1%

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

By weekday, OO 3951 did best on Wednesday at 95.6% on time and worst on Friday at 76.7%. Each day rests on about 43 flights, so a gap of 19 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 3951 runs late

One category carries most of the weight here. Carrier accounts for 62% of the 2,913 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
62%
National Airspace System
25%
Extreme weather
13%

Extreme weather accounts for 13% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.1 times the usual weather exposure. The split is drawn from 2,913 delay minutes reported on OO 3951.

Cancellations are rare at 0.33%, 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 4.7% 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 3951 is not only a LAX to PHX flight. It also flew PHX to LAX (283 flights, 87.9% 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. 302 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 3951
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
PHX to LAXthin sample	283	87.9%	80 min	0.35%	A+

What to do with this

Booking OO 3951

For a booking, OO 3951 has one of the better records a US domestic flight can show: 87.4% on time and 0.33% 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