Flight number record

OO 3745

SkyWest Airlines · Tucson to Salt Lake City

Route: TUS → SLC
Departs: 07:10
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 3745, 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 3745 earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 20 points better than the national rate of 77.6%. When something does go wrong the average delay runs roughly 50 minutes. That rests on 365 flights, with a median arrival 18 minutes early.

Set against the rest of the country, OO 3745's record is 20 points better than the US average of 77.6%. That gap is worth roughly 202 fewer late arrivals for every thousand flights.

On time

97.8%

Arrivals under 15 minutes late, of 364 completed flights

Avg delay

49 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

1 hour+ late

0.3%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. The median arrival is 18 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 3745 flies

OO 3745 flies TUS to SLC without a single fixed slot. Its most common scheduled departure was 07:10, used on 90 of 365 flights, with 05:55 (87 flights) and 06:45 (57 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 07:1090 flights24.7%
Departs 05:5587 flights23.8%
Departs 06:4557 flights15.6%

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 07:10 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 3745 runs 9 points better at 97.8%. 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 3745 next to TUS to SLC

Every carrier on TUS to SLC combined arrived on time 93.7% of the time across 1,112 flights, so OO 3745 is 4 points ahead of it. SkyWest flew 1,087 flights on the same city pair under all its flight numbers, including this one, and those ran 93.8% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 19 points.

OO 3745 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3745	365	97.8%	49 min	0.00%	A+
All SkyWest Airlines on TUS–SLC	1,087	93.8%	81 min	0.18%	A+
All carriers on TUS–SLC	1,112	93.7%	79 min	0.27%	A+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 3745 quarter by quarter

Quarter by quarter OO 3745 held fairly steady: 98.9% in Jul–Sep 2025, 97.8% in Oct–Dec 2025, 97.8% in Jan–Mar 2026 and 96.7% in Apr–Jun 2026. A spread of 2 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights98.9%
Oct–Dec 202592 flights97.8%
Jan–Mar 202690 flights97.8%
Apr–Jun 202691 flights96.7%

Scale runs 90% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 3745 ranged from 94.2% on Thursday to 100.0% on Monday. With about 52 flights behind each day, a spread of 6 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why OO 3745 runs late

One category carries most of the weight here. Carrier accounts for 80% of the 390 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
80%
Extreme weather
13%
National Airspace System
7%

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 2.0 times the usual weather exposure. The split is drawn from 390 delay minutes reported on OO 3745.

Cancellations are rare at 0.00%, below the national 1.81% and low enough to earn the plus on the grade. Almost no flights are 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 0.3% 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 600 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.

Every one of the 365 flights under OO 3745 in the data flew TUS to SLC. 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. 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.

What to do with this

Booking OO 3745

For a booking, OO 3745 has one of the better records a US domestic flight can show: 97.8% on time and 0.00% 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