Flight number record

OO 4134

SkyWest Airlines · Salt Lake City to Oakland

Route: SLC → OAK
Departs: 10:45
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4134, 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 4134 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 15 points better than the national rate of 77.6%. When something does go wrong the average delay runs about 50 minutes. That rests on 365 flights, with a median arrival 6 minutes early.

Set against the rest of the country, OO 4134's record is 15 points better than the US average of 77.6%. That gap is worth roughly 152 fewer late arrivals for every thousand flights.

On time

92.8%

Arrivals under 15 minutes late, of 363 completed flights

Avg delay

49 min

Across delayed arrivals only, not all flights

Cancelled

0.55%

National rate is 1.81%

1 hour+ late

1.9%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. The median arrival is 6 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 4134 flies

OO 4134 flies SLC to OAK without a single fixed slot. Its most common scheduled departure was 10:45, used on 146 of 365 flights, with 10:50 (133 flights) and 10:55 (55 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 10:45146 flights40.0%
Departs 10:50133 flights36.4%
Departs 10:5555 flights15.1%

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 10:45 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and OO 4134 runs 9 points better at 92.8%. 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 4134 next to SLC to OAK

Every carrier on SLC to OAK combined arrived on time 90.2% of the time across 1,670 flights, so OO 4134 is 3 points ahead of it. SkyWest flew 1,074 flights on the same city pair under all its flight numbers, including this one, and those ran 92.4% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 14 points.

OO 4134 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4134	365	92.8%	49 min	0.55%	A+
All SkyWest Airlines on SLC–OAK	1,074	92.4%	53 min	0.19%	A+
All carriers on SLC–OAK	1,670	90.2%	53 min	0.18%	A+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4134 quarter by quarter

Quarter by quarter OO 4134 held fairly steady: 96.7% in Jul–Sep 2025, 92.2% in Oct–Dec 2025, 87.8% in Jan–Mar 2026 and 94.5% in Apr–Jun 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights96.7%
Oct–Dec 202592 flights92.2%
Jan–Mar 202690 flights87.8%
Apr–Jun 202691 flights94.5%

Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4134 ranged from 86.5% on Friday to 96.1% on Monday. With about 52 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.

Delay causes

Why OO 4134 runs late

One category carries most of the weight here. Carrier accounts for 70% of the 1,279 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
70%
National Airspace System
16%
Extreme weather
14%

Extreme weather accounts for 14% 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 2.3 times the usual weather exposure. The split is drawn from 1,279 delay minutes reported on OO 4134.

Cancellations are rare at 0.55%, 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 1.9% 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 588 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.

OO 4134 is not only a SLC to OAK flight. It also flew OAK to SLC (365 flights, 93.9% 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. 365 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 4134
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
OAK to SLC	365	93.9%	79 min	0.55%	A+

What to do with this

Booking OO 4134

For a booking, OO 4134 has one of the better records a US domestic flight can show: 92.8% on time and 0.55% 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