Flight number record
OO 4126
SkyWest Airlines · Los Angeles to Reno
- Route
- LAX → RNO
- Departs
- 15:00
- Flights
- 361
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4126, 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 4126 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 12 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 361 flights, with a median arrival 12 minutes early.
Set against the rest of the country, OO 4126's record is 12 points better than the US average of 77.3%. That gap is worth roughly 121 fewer late arrivals for every thousand flights.
Key figures
On time
89.4%
Arrivals under 15 minutes late, of 359 completed flights
Avg delay
55 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
3.1%
National rate is 8.3%
These figures cover 361 flights between September 2025 and August 2026. The median arrival is 12 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 4126 flies
OO 4126 flies LAX to RNO without a single fixed slot. Its most common scheduled departure was 15:00, used on 110 of 361 flights, with 16:50 (56 flights) next.
- Departs 15:00110 flights30.5%
- Departs 16:5056 flights15.5%
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 15:00 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and OO 4126 runs 18 points better at 89.4%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
OO 4126 next to LAX to RNO
Every carrier on LAX to RNO combined arrived on time 89.1% of the time across 2,470 flights, so OO 4126 is about level with it. SkyWest flew 1,973 flights on the same city pair under all its flight numbers, including this one, and those ran 91.7% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4126thin sample | 361 | 89.4% | 55 min | 0.00% | A+ |
| All SkyWest Airlines on LAX–RNO | 1,973 | 91.7% | 63 min | 0.30% | A+ |
| All carriers on LAX–RNO | 2,470 | 89.1% | 56 min | 0.40% | A+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4126 quarter by quarter
OO 4126 did not run the same all year. Its best quarter was Jul–Sep 2025 at 100.0% on time and its weakest Jul–Sep 2026 at 82.3%, a swing of 18 points on roughly 72 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 flights100.0%
- Oct–Dec 202589 flights89.8%
- Jan–Mar 202689 flights90.9%
- Apr–Jun 202691 flights89.0%
- Jul–Sep 202662 flights82.3%
Scale runs 75% to 100%.
By weekday, OO 4126 ranged from 88.0% on Wednesday to 92.2% on Tuesday. With about 52 flights behind each day, a spread of 4 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 4126 runs when it is late
OO 4126 often beats the schedule: 156 of 359 completed flights, 43%, arrived 15 minutes or more early. The 38 late arrivals split 14 under half an hour, 13 between 30 and 60 minutes, and 11 an hour or more.
- 15+ min early156 flights43.5%
- Within 15 min165 flights46.0%
- 15–29 min late14 flights3.9%
- 30–59 min late13 flights3.6%
- 1–2 hours late7 flights1.9%
- 2+ hours late4 flights1.1%
Scale runs 0% to 100%.
Share of 359 completed flights by arrival against schedule.
13 of 48 late departures made up the time and arrived on time, 27% of them. Only 3 left on time and still arrived late.
The worst days
Worst days for OO 4126
The latest arrival of the period was on 16 October 2025, 3 hours 2 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 |
|---|---|---|
| 16 October 2025 | 3 hours 2 minutes | Carrier |
| 10 June 2026 | 2 hours 54 minutes | Carrier |
| 24 March 2026 | 2 hours 41 minutes | Carrier |
| 5 July 2026 | 2 hours 12 minutes | Carrier |
| 3 May 2026 | 1 hour 30 minutes | Carrier |
Delay causes
Why OO 4126 runs late
Carrier accounts for 80% of the 2,106 delay minutes carriers reported here, and the remaining four split what is left.
- 80%Carrier
- 14%Extreme weather
- 6%National Airspace System
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 2.4 times the usual weather exposure. The split is drawn from 2,106 delay minutes reported on OO 4126.
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
Badly late arrivals are rare here: only 3.1% 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 RNO to LAX (235), but none flew often enough under OO 4126 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to LAX to RNO only.
One caution: this is a thin sample. 361 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 4126
For a booking, OO 4126 has one of the better records a US domestic flight can show: 89.4% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- LAX to RNO, every carrier and departure
- RNO to LAX, the return direction
- SkyWest Airlines 4099 on the same route95.3%
- SkyWest Airlines 3929 on the same route88.7%
- SkyWest Airlines 5410 on the same route94.8%
- 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.