Carrier route record

OOSJC→SLC

SkyWest Airlines · San Jose to Salt Lake City

Flights: 692
Period: July 2025 to June 2026
Share of route: 38%
Carriers: 3

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

SkyWest on SJC to SLC earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 17 points better than the national rate of 77.6%. When something does go wrong the average delay runs an hour and a half. That rests on 692 flights, with a median arrival 14 minutes early.

Set against the rest of the country, SkyWest's SJC to SLC record is 17 points better than the US average of 77.6%. That gap is worth roughly 173 fewer late arrivals for every thousand flights.

On time

94.9%

Arrivals under 15 minutes late, of 691 completed flights

Avg delay

85 min

Across delayed arrivals only, not all flights

Cancelled

0.14%

National rate is 1.81%

Whole route

92.2%

Every carrier on SJC to SLC, 1,808 flights

These figures cover 692 flights between July 2025 and June 2026. The median arrival is 14 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.

Carrier by carrier

SkyWest against every carrier on SJC to SLC

SkyWest flew 692 of the 1,808 flights on SJC to SLC, about 38% of it. Its 94.9% on time is 3 points better than the route as a whole, which runs 92.2%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from SkyWest at 94.9% to Southwest at 83.4%. 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 SJC to SLC
Airline	Flights	On time	Avg delay	Cancelled	Grade
SkyWest Airlines (this page)	692	94.9%	85 min	0.14%	A+
Delta Air Lines	892	92.3%	100 min	0.67%	A+
Southwest Airlinesthin sample	224	83.4%	53 min	0.45%	B+

Departure window

When SkyWest runs best on this route

Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 692 flights.

5am–8am—
8am–11am313 flights96.2%
11am–2pm—
2pm–5pm100 flights95.0%
5pm–8pm279 flights93.5%
8pm–5am—

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

The 8am–11am window is the strongest at 96.2% on time. The full set of windows spans 3 points.

Across the year

SkyWest on SJC to SLC through the year

Darker means more delays. Figures are on-time percentages.March best, May worst

Delays peak in May, when the on-time rate falls to 88.2%. March is the strongest month at 98.2%. Moving a flexible trip across that boundary buys 10 points. October was the busiest month here, with 85 flights.

Across the week, Tuesday is the strongest day at 99.1% on time and Monday the weakest at 92.5%. 7 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 89% of the 2,981 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
89%
Extreme weather
9%
National Airspace System
2%

The largest share of delay minutes, 89%, 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 2,657 of the 2,981 delay minutes reported here. The split is drawn from 2,981 reported delay minutes.

Cancellations are rare at 0.14%, 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 stage length

What a delay here costs

Badly late arrivals are rare here: only 2.5% 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.

The 584 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 92.9% on time across 694 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. 692 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 SJC to SLC

Put together: treat all of this as provisional. 692 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 94.9% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 691 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