Flight number record

OO 4078

SkyWest Airlines · Las Vegas to Santa Ana

Route: LAS → SNA
Departs: 08:00
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 10 points better than the national rate of 77.6%. When something does go wrong the average delay runs an hour and a half. That rests on 365 flights, with a median arrival 11 minutes early.

Set against the rest of the country, OO 4078's record is 10 points better than the US average of 77.6%. That gap is worth roughly 103 fewer late arrivals for every thousand flights.

On time

87.9%

Arrivals under 15 minutes late, of 364 completed flights

Avg delay

87 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

1 hour+ late

4.4%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 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.

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 161 of 365 flights, with 10:05 (48 flights) and 08:55 (46 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 08:00161 flights44.1%
Departs 10:0548 flights13.2%
Departs 08:5546 flights12.6%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

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 84.1%, and OO 4078 runs 4 points better at 87.9%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

OO 4078 next to LAS to SNA

Every carrier on LAS to SNA combined arrived on time 81.9% of the time across 4,252 flights, so OO 4078 is 6 points ahead of it. SkyWest flew 760 flights on the same city pair under all its flight numbers, including this one, and those ran 86.7% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 9 points.

OO 4078 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4078	365	87.9%	87 min	0.00%	A+
All SkyWest Airlines on LAS–SNA	760	86.7%	81 min	0.66%	A+
All carriers on LAS–SNA	4,252	81.9%	56 min	0.73%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4078 quarter by quarter

OO 4078 did not run the same all year. Its best quarter was Apr–Jun 2026 at 94.5% on time and its weakest Oct–Dec 2025 at 81.3%, a swing of 13 points on roughly 91 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 202592 flights89.1%
Oct–Dec 202592 flights81.3%
Jan–Mar 202690 flights86.7%
Apr–Jun 202691 flights94.5%

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4078 did best on Thursday at 98.1% on time and worst on Sunday at 84.6%. Each day rests on about 52 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 4078 runs late

One category carries most of the weight here. Carrier accounts for 64% of the 3,824 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Carrier
64%
National Airspace System
35%
Extreme weather
1%

35% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,332 minutes out of 3,824, against a national NAS share of 21%. The split is drawn from 3,824 delay minutes reported on OO 4078.

Cancellations are rare at 0.00%, below the national 1.81% 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 4.4% land an hour or more behind schedule, against 8.1% 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, 86.8% 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.

Other routes flown as OO 4078
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
SNA to LASthin sample	349	86.8%	91 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: 87.9% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures