Flight number record
OO 3745
SkyWest Airlines · Tucson to Salt Lake City
- Route
- TUS → SLC
- Departs
- 07:10
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 21 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 40 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 21 points better than the US average of 77.3%. That gap is worth roughly 205 fewer late arrivals for every thousand flights.
Key figures
On time
97.8%
Arrivals under 15 minutes late, of 363 completed flights
Avg delay
38 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
0.0%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 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.
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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 07:05 (57 flights) and 06:45 (57 flights) next.
- Departs 07:1090 flights24.7%
- Departs 07:0557 flights15.6%
- Departs 06:4557 flights15.6%
Scale runs 0% to 100%.
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.
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Against the route
OO 3745 next to TUS to SLC
Every carrier on TUS to SLC combined arrived on time 92.8% of the time across 1,112 flights, so OO 3745 is 5 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 92.9% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 19 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 3745 | 365 | 97.8% | 38 min | 0.00% | A+ |
| All SkyWest Airlines on TUS–SLC | 1,087 | 92.9% | 75 min | 0.18% | A+ |
| All carriers on TUS–SLC | 1,112 | 92.8% | 74 min | 0.27% | A+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 3745 quarter by quarter
Quarter by quarter OO 3745 held fairly steady: 100.0% in Jul–Sep 2025, 97.8% in Oct–Dec 2025, 97.8% in Jan–Mar 2026, 96.7% in Apr–Jun 2026 and 98.4% in Jul–Sep 2026. A spread of 3 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights100.0%
- Oct–Dec 202592 flights97.8%
- Jan–Mar 202690 flights97.8%
- Apr–Jun 202691 flights96.7%
- Jul–Sep 202662 flights98.4%
Scale runs 90% to 100%.
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.
Arrival by arrival
How late OO 3745 runs when it is late
OO 3745 often beats the schedule: 237 of 363 completed flights, 65%, arrived 15 minutes or more early. The 8 late arrivals split 2 under half an hour, 6 between 30 and 60 minutes, and 0 an hour or more. Not one arrived two hours late.
- 15+ min early237 flights65.3%
- Within 15 min118 flights32.5%
- 15–29 min late2 flights0.6%
- 30–59 min late6 flights1.7%
- 1–2 hours late0 flights0.0%
- 2+ hours late0 flights0.0%
Scale runs 0% to 100%.
Share of 363 completed flights by arrival against schedule.
Only 7 of 363 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for OO 3745
The latest arrival of the period was on 28 December 2025, 56 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 28 December 2025 | 56 minutes | Carrier |
| 27 May 2026 | 44 minutes | Carrier |
| 14 July 2026 | 43 minutes | Carrier |
| 12 June 2026 | 42 minutes | Extreme weather |
| 6 November 2025 | 40 minutes | Carrier |
Delay causes
Why OO 3745 runs late
Carrier accounts for 74% of the 302 delay minutes carriers reported here, and the remaining four split what is left.
- 74%Carrier
- 16%Extreme weather
- 10%National Airspace System
Extreme weather accounts for 16% 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 2.7 times the usual weather exposure. The split is drawn from 302 delay minutes reported on OO 3745.
Cancellations are rare at 0.00%, below the national 1.89% 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
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.
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.
Related
Where to go next
- TUS to SLC, every carrier and departure
- SLC to TUS, the return direction
- Salt Lake City International (SLC) delay statistics
- SkyWest Airlines on-time record
- Every SkyWest Airlines flight number with a record
- The most and least reliable flight numbers in the US
- How to read this site: grades, sample sizes, and honest caveats
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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.