Flight number record
OO 4133
SkyWest Airlines · Aspen to Los Angeles
- Route
- ASE → LAX
- Departs
- 12:03
- Flights
- 336
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4133, 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 4133 sits in the middle of the pack with a C−. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 336 flights, with a median arrival 10 minutes early.
Key figures
On time
74.2%
Arrivals under 15 minutes late, of 322 completed flights
Avg delay
86 min
Across delayed arrivals only, not all flights
Cancelled
3.57%
National rate is 1.89%
1 hour+ late
11.5%
National rate is 8.3%
These figures cover 336 flights between September 2025 and August 2026. Beyond the headline rate, 11.5% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 4133 flies
OO 4133 flies ASE to LAX without a single fixed slot. Its most common scheduled departure was 12:03, used on 86 of 336 flights, with 12:20 (52 flights) and 12:24 (38 flights) next.
- Departs 12:0386 flights25.6%
- Departs 12:2052 flights15.5%
- Departs 12:2438 flights11.3%
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 12:03 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 4133 runs 4 points worse at 74.2%. 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 4133 next to ASE to LAX
Every carrier on ASE to LAX combined arrived on time 73.9% of the time across 1,228 flights, so OO 4133 is about level with it. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4133thin sample | 336 | 74.2% | 86 min | 3.57% | C− |
| All SkyWest Airlines on ASE–LAX | 1,228 | 73.9% | 123 min | 6.68% | C− |
| All carriers on ASE–LAX | 1,228 | 73.9% | 123 min | 6.68% | C− |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4133 quarter by quarter
OO 4133 did not run the same all year. Its best quarter was Apr–Jun 2026 at 83.6% on time and its weakest Jan–Mar 2026 at 67.4%, a swing of 16 points on roughly 67 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 flights76.7%
- Oct–Dec 202592 flights70.8%
- Jan–Mar 202690 flights67.4%
- Apr–Jun 202662 flights83.6%
- Jul–Sep 202662 flights79.0%
Scale runs 60% to 90%.
By weekday, OO 4133 did best on Wednesday at 83.0% on time and worst on Sunday at 65.2%. Each day rests on about 48 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4133 runs when it is late
OO 4133 often beats the schedule: 128 of 322 completed flights, 40%, arrived 15 minutes or more early. The 83 late arrivals split 27 under half an hour, 19 between 30 and 60 minutes, and 37 an hour or more.
- 15+ min early128 flights39.8%
- Within 15 min111 flights34.5%
- 15–29 min late27 flights8.4%
- 30–59 min late19 flights5.9%
- 1–2 hours late16 flights5.0%
- 2+ hours late21 flights6.5%
Scale runs 0% to 100%.
Share of 322 completed flights by arrival against schedule.
22 of 90 late departures made up the time and arrived on time, 24% of them. 15 flights left on time and still arrived late.
The worst days
Worst days for OO 4133
The latest arrival of the period was on 1 December 2025, 9 hours 22 minutes behind schedule; most of its delay minutes were filed as extreme weather. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 1 December 2025 | 9 hours 22 minutes | Extreme weather |
| 7 December 2025 | 6 hours 10 minutes | Extreme weather |
| 23 February 2026 | 5 hours 46 minutes | Carrier |
| 4 January 2026 | 4 hours 35 minutes | Extreme weather |
| 26 July 2026 | 4 hours 31 minutes | Extreme weather |
Delay causes
Why OO 4133 runs late
Extreme weather accounts for 49% of the 7,116 delay minutes carriers reported here, and the remaining four split what is left.
- 49%Extreme weather
- 43%Carrier
- 9%National Airspace System
Extreme weather accounts for 49% 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 8.1 times the usual weather exposure. The split is drawn from 7,116 delay minutes reported on OO 4133.
Cancellations run at 3.57%, against 1.89% nationally. That is about one flight in 30 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
11.5% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 737 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 336 flights under OO 4133 in the data flew ASE to LAX. 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. 336 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 4133
For a booking, the cancellation rate is the figure to plan around on OO 4133: 3.57% of its 336 scheduled flights did not operate. A late arrival costs an hour and a half, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- ASE to LAX, every carrier and departure
- LAX to ASE, the return direction
- 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
- How often a connection fails at the major US hubs
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.