Carrier route record

OOSBP→PHX

SkyWest Airlines · San Luis Obispo to Phoenix

Flights: 417
Period: July 2025 to June 2026
Share of route: 34%
Carriers: 3

Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with SkyWest Airlines.

SkyWest on SBP to PHX lands a B+, 3 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by close to two hours on average. That is a workable record, not a spotless one. That rests on 417 flights, with a median arrival 6 minutes early.

The US average over the same twelve months is 77.6%, so there is little to separate SkyWest on SBP to PHX from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.

On time

80.1%

Arrivals under 15 minutes late, of 413 completed flights

Avg delay

103 min

Across delayed arrivals only, not all flights

Cancelled

0.96%

National rate is 1.81%

Whole route

82.9%

Every carrier on SBP to PHX, 1,230 flights

These figures cover 417 flights between July 2025 and June 2026. Beyond the headline rate, 8.2% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Carrier by carrier

SkyWest against every carrier on SBP to PHX

SkyWest flew 417 of the 1,230 flights on SBP to PHX, about 34% of it. Its 80.1% on time is 3 points worse than the route as a whole, which runs 82.9%. Ranked by on-time rate it is last of three carriers on the route, where the range runs from Envoy at 89.6% to SkyWest at 80.1%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.

Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.

On-time performance by carrier on SBP to PHX
Airline	Flights	On time	Avg delay	Cancelled	Grade
Envoy Airthin sample	281	89.6%	47 min	1.07%	A
American Airlines	532	81.6%	152 min	0.94%	B+
SkyWest Airlines (this page)	417	80.1%	103 min	0.96%	B+

Departure window

When SkyWest runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 11 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am73 flights83.1%
8am–11am2 flights—
11am–2pm75 flights84.0%
2pm–5pm118 flights73.3%
5pm–8pm149 flights82.6%
8pm–5am—

Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.

The best window here is not the first bank but the 11am–2pm slot at 84.0% on time, ahead of 2pm–5pm at 73.3%. Where the curve peaks mid-day rather than at dawn, the constraint is usually congestion at one end rather than the aircraft's own rotation. The 5pm–8pm window is the busiest, with 149 flights scheduled in it.

Across the year

SkyWest on SBP to PHX through the year

Jul–Sep 2025112 flights81.8%
Oct–Dec 202565 flights78.1%
Jan–Mar 2026106 flights74.3%
Apr–Jun 2026134 flights84.3%

Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.

Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 80.1% on time across 417 flights.

SkyWest on SBP to PHX did not run the same all year. Its best quarter was Apr–Jun 2026 at 84.3% on time and its weakest Jan–Mar 2026 at 74.3%, a swing of 10 points on roughly 104 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.

Across the week, Wednesday is the strongest day at 91.5% on time and Sunday the weakest at 73.1%. 18 points is a smaller lever than departure hour, but it is free.

Delay causes

Why SkyWest runs late on this route

One category carries most of the weight here. Carrier accounts for 57% of the 8,429 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
57%
Extreme weather
22%
Late-arriving aircraft
15%
National Airspace System
4%
Security
2%

Extreme weather accounts for 22% 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 monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 3.5 times the usual weather exposure. The split is drawn from 8,429 reported delay minutes.

The largest share of delay minutes, 57%, 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 4,832 of the 8,429 delay minutes reported here.

Cancellations sit at 0.96% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and stage length

What a delay here costs

8.2% 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.

The 509 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

The return leg runs 78.5% on time across 417 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.

One caution: this is a thin sample. 417 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 SkyWest on SBP to PHX

Put together: treat all of this as provisional. 417 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 80.1% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 413 completed flights over 12 months sit behind that.

Where to go next

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