Flight number record
OO 3766
SkyWest Airlines · Los Angeles to Tucson
- Route
- LAX → TUS
- Departs
- 09:35
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 3766, 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 3766 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 14 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 365 flights, with a median arrival 11 minutes early.
Set against the rest of the country, OO 3766's record is 14 points better than the US average of 77.3%. That gap is worth roughly 143 fewer late arrivals for every thousand flights.
Key figures
On time
91.6%
Arrivals under 15 minutes late, of 359 completed flights
Avg delay
67 min
Across delayed arrivals only, not all flights
Cancelled
1.64%
National rate is 1.89%
1 hour+ late
4.5%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 11 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 3766 flies
OO 3766 flies LAX to TUS without a single fixed slot. Its most common scheduled departure was 09:35, used on 123 of 365 flights, with 09:15 (48 flights) and 09:40 (42 flights) next.
- Departs 09:35123 flights33.7%
- Departs 09:1548 flights13.2%
- Departs 09:4042 flights11.5%
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 09:35 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 3766 runs 8 points better at 91.6%. 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 3766 next to LAX to TUS
Every carrier on LAX to TUS combined arrived on time 79.7% of the time across 2,619 flights, so OO 3766 is 12 points ahead of it. SkyWest flew 2,127 flights on the same city pair under all its flight numbers, including this one, and those ran 83.4% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 3766 | 365 | 91.6% | 67 min | 1.64% | A |
| All SkyWest Airlines on LAX–TUS | 2,127 | 83.4% | 84 min | 0.42% | B+ |
| All carriers on LAX–TUS | 2,619 | 79.7% | 73 min | 0.38% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 3766 quarter by quarter
OO 3766 did not run the same all year. Its best quarter was Oct–Dec 2025 at 97.7% on time and its weakest Jul–Sep 2026 at 85.5%, a swing of 12 points on roughly 73 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.
- Jul–Sep 202530 flights90.0%
- Oct–Dec 202592 flights97.7%
- Jan–Mar 202690 flights91.1%
- Apr–Jun 202691 flights91.2%
- Jul–Sep 202662 flights85.5%
Scale runs 75% to 100%.
By weekday, OO 3766 did best on Tuesday at 98.0% on time and worst on Monday at 83.0%. Each day rests on about 52 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 3766 runs when it is late
OO 3766 often beats the schedule: 134 of 359 completed flights, 37%, arrived 15 minutes or more early. When OO 3766 is late it tends to be very late: 16 of its 30 late arrivals were an hour or more behind, and 5 were two hours or more.
- 15+ min early134 flights37.3%
- Within 15 min195 flights54.3%
- 15–29 min late9 flights2.5%
- 30–59 min late5 flights1.4%
- 1–2 hours late11 flights3.1%
- 2+ hours late5 flights1.4%
Scale runs 0% to 100%.
Share of 359 completed flights by arrival against schedule.
8 of 35 late departures made up the time and arrived on time, 23% of them. Only 3 left on time and still arrived late.
The worst days
Worst days for OO 3766
The latest arrival of the period was on 8 March 2026, 3 hours 21 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 8 March 2026 | 3 hours 21 minutes | Carrier |
| 13 June 2026 | 3 hours 19 minutes | Carrier |
| 12 June 2026 | 2 hours 24 minutes | Carrier |
| 1 February 2026 | 2 hours 9 minutes | Carrier |
| 16 February 2026 | 2 hours 1 minute | Carrier |
Delay causes
Why OO 3766 runs late
Carrier accounts for 79% of the 2,012 delay minutes carriers reported here, and the remaining four split what is left.
- 79%Carrier
- 15%Extreme weather
- 6%National Airspace System
Extreme weather accounts for 15% 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 2.6 times the usual weather exposure. The split is drawn from 2,012 delay minutes reported on OO 3766.
Cancellations sit at 1.64% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 4.5% land an hour or more behind schedule, against 8.3% 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 same number turns up on one other city pair in the data, including TUS to LAX (170), but none flew often enough under OO 3766 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to LAX to TUS only.
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 3766
For a booking, read OO 3766 as 91.6% on time with 1.64% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- LAX to TUS, every carrier and departure
- TUS to LAX, the return direction
- SkyWest Airlines 3846 on the same route84.4%
- SkyWest Airlines 3776 on the same route81.0%
- Los Angeles International (LAX) 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
- Worst months to fly in the US, ranked by the data
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.