Flight number record
OO 4951
SkyWest Airlines · San Antonio to Los Angeles
- Route
- SAT → LAX
- Departs
- 07:00
- Flights
- 328
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4951, 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 4951 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 2.8 hours. That rests on 328 flights, with a median arrival 11 minutes early.
Set against the rest of the country, OO 4951's record is 14 points better than the US average of 77.3%. That gap is worth roughly 144 fewer late arrivals for every thousand flights.
Key figures
On time
91.7%
Arrivals under 15 minutes late, of 325 completed flights
Avg delay
167 min
Across delayed arrivals only, not all flights
Cancelled
0.61%
National rate is 1.89%
1 hour+ late
3.4%
National rate is 8.3%
These figures cover 328 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 4951 flies
OO 4951 flies SAT to LAX without a single fixed slot. Its most common scheduled departure was 07:00, used on 106 of 328 flights, with 08:30 (42 flights) next.
- Departs 07:00106 flights32.3%
- Departs 08:3042 flights12.8%
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 07:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 4951 runs 2 points better at 91.7%. 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 4951 next to SAT to LAX
Every carrier on SAT to LAX combined arrived on time 85.9% of the time across 1,814 flights, so OO 4951 is 6 points ahead of it. SkyWest flew 697 flights on the same city pair under all its flight numbers, including this one, and those ran 90.3% 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 4951thin sample | 328 | 91.7% | 167 min | 0.61% | A+ |
| All SkyWest Airlines on SAT–LAX | 697 | 90.3% | 122 min | 0.29% | A+ |
| All carriers on SAT–LAX | 1,814 | 85.9% | 88 min | 0.44% | A+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4951 quarter by quarter
Quarter by quarter OO 4951 held fairly steady: 86.7% in Jul–Sep 2025, 95.0% in Oct–Dec 2025, 90.5% in Jan–Mar 2026, 91.0% in Apr–Jun 2026 and 93.5% in Jul–Sep 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights86.7%
- Oct–Dec 202561 flights95.0%
- Jan–Mar 202684 flights90.5%
- Apr–Jun 202691 flights91.0%
- Jul–Sep 202662 flights93.5%
Scale runs 80% to 100%.
By weekday, OO 4951 ranged from 85.1% on Monday to 95.8% on Wednesday. With about 47 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 4951 runs when it is late
OO 4951 often beats the schedule: 132 of 325 completed flights, 41%, arrived 15 minutes or more early. The 27 late arrivals split 11 under half an hour, 5 between 30 and 60 minutes, and 11 an hour or more.
- 15+ min early132 flights40.6%
- Within 15 min166 flights51.1%
- 15–29 min late11 flights3.4%
- 30–59 min late5 flights1.5%
- 1–2 hours late3 flights0.9%
- 2+ hours late8 flights2.5%
Scale runs 0% to 100%.
Share of 325 completed flights by arrival against schedule.
6 of 23 late departures made up the time and arrived on time, 26% of them. 10 flights left on time and still arrived late.
The worst days
Worst days for OO 4951
The latest arrival of the period was on 20 April 2026, 25 hours 36 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 |
|---|---|---|
| 20 April 2026 | 25 hours 36 minutes | Carrier |
| 4 June 2026 | 12 hours 58 minutes | Carrier |
| 19 January 2026 | 6 hours 26 minutes | Carrier |
| 20 May 2026 | 6 hours 25 minutes | Carrier |
| 29 December 2025 | 4 hours 22 minutes | Carrier |
Delay causes
Why OO 4951 runs late
Carrier accounts for 91% of the 4,519 delay minutes carriers reported here, and the remaining four split what is left.
- 91%Carrier
- 6%Extreme weather
- 3%National Airspace System
The largest share of delay minutes, 91%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 4,125 of the 4,519 delay minutes reported here. The split is drawn from 4,519 delay minutes reported on OO 4951.
Cancellations are rare at 0.61%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is 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 3.4% 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 1,211 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.
The same number turns up on one other city pair in the data, including RST to ORD (30), but none flew often enough under OO 4951 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SAT to LAX only.
One caution: this is a thin sample. 328 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 4951
For a booking, OO 4951 has one of the better records a US domestic flight can show: 91.7% on time and 0.61% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- SAT to LAX, every carrier and departure
- LAX to SAT, the return direction
- Delta Air Lines 2534 on the same route91.6%
- San Antonio International (SAT) delay statistics
- 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.