Flight number record
OO 4078
SkyWest Airlines · Las Vegas to Santa Ana
- Route
- LAS → SNA
- Departs
- 08:00
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4078, 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 4078 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 11 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 365 flights, with a median arrival 12 minutes early.
Set against the rest of the country, OO 4078's record is 11 points better than the US average of 77.3%. That gap is worth roughly 109 fewer late arrivals for every thousand flights.
Key figures
On time
88.2%
Arrivals under 15 minutes late, of 364 completed flights
Avg delay
89 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
4.1%
National rate is 8.3%
These figures cover 365 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 4078 flies
OO 4078 flies LAS to SNA without a single fixed slot. Its most common scheduled departure was 08:00, used on 140 of 365 flights, with 08:45 (57 flights) and 09:00 (53 flights) next.
- Departs 08:00140 flights38.4%
- Departs 08:4557 flights15.6%
- Departs 09:0053 flights14.5%
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 08:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 4078 runs 4 points better at 88.2%. 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 4078 next to LAS to SNA
Every carrier on LAS to SNA combined arrived on time 81.3% of the time across 4,085 flights, so OO 4078 is 7 points ahead of it. SkyWest flew 726 flights on the same city pair under all its flight numbers, including this one, and those ran 87.0% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4078 | 365 | 88.2% | 89 min | 0.00% | A+ |
| All SkyWest Airlines on LAS–SNA | 726 | 87.0% | 80 min | 0.55% | A+ |
| All carriers on LAS–SNA | 4,085 | 81.3% | 54 min | 0.73% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4078 quarter by quarter
OO 4078 did not run the same all year. Its best quarter was Jul–Sep 2026 at 95.2% on time and its weakest Jul–Sep 2025 at 80.0%, a swing of 15 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 flights80.0%
- Oct–Dec 202592 flights81.3%
- Jan–Mar 202690 flights86.7%
- Apr–Jun 202691 flights94.5%
- Jul–Sep 202662 flights95.2%
Scale runs 70% to 100%.
By weekday, OO 4078 did best on Thursday at 98.1% on time and worst on Saturday at 82.7%. 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 4078 runs when it is late
OO 4078 often beats the schedule: 136 of 364 completed flights, 37%, arrived 15 minutes or more early. The 43 late arrivals split 17 under half an hour, 11 between 30 and 60 minutes, and 15 an hour or more.
- 15+ min early136 flights37.4%
- Within 15 min185 flights50.8%
- 15–29 min late17 flights4.7%
- 30–59 min late11 flights3.0%
- 1–2 hours late5 flights1.4%
- 2+ hours late10 flights2.7%
Scale runs 0% to 100%.
Share of 364 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 35 departures that left 15 minutes late or more, only 4 made it up before arrival. 12 flights left on time and still arrived late.
The worst days
Worst days for OO 4078
The latest arrival of the period was on 18 May 2026, 8 hours 50 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 18 May 2026 | 8 hours 50 minutes | National Airspace System |
| 12 June 2026 | 6 hours 49 minutes | Carrier |
| 9 December 2025 | 4 hours 41 minutes | Carrier |
| 10 November 2025 | 3 hours 51 minutes | National Airspace System |
| 2 September 2025 | 3 hours 40 minutes | National Airspace System |
Delay causes
Why OO 4078 runs late
Carrier accounts for 70% of the 3,841 delay minutes carriers reported here, and the remaining four split what is left.
- 70%Carrier
- 29%National Airspace System
- 1%Extreme weather
The largest share of delay minutes, 70%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,671 of the 3,841 delay minutes reported here. The split is drawn from 3,841 delay minutes reported on OO 4078.
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 4.1% 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.
OO 4078 is not only a LAS to SNA flight. It also flew SNA to LAS (349 flights, 88.0% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SNA to LASthin sample | 349 | 88.0% | 95 min | 0.00% | A+ |
What to do with this
Booking OO 4078
For a booking, OO 4078 has one of the better records a US domestic flight can show: 88.2% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- LAS to SNA, every carrier and departure
- SNA to LAS, the return direction
- Harry Reid International (LAS) delay statistics
- John Wayne Airport (SNA) 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.