Flight number record
OO 4087
SkyWest Airlines · San Diego to Los Angeles
- Route
- SAN → LAX
- Departs
- 19:35
- Flights
- 319
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4087, 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 4087 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 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 319 flights, with a median arrival 14 minutes early.
Set against the rest of the country, OO 4087's record is 11 points better than the US average of 77.6%. That gap is worth roughly 113 fewer late arrivals for every thousand flights.
Key figures
On time
88.9%
Arrivals under 15 minutes late, of 316 completed flights
Avg delay
75 min
Across delayed arrivals only, not all flights
Cancelled
0.94%
National rate is 1.81%
1 hour+ late
3.5%
National rate is 8.1%
These figures cover 319 flights between July 2025 and June 2026. The median arrival is 14 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 4087 flies
OO 4087 flies SAN to LAX without a single fixed slot. Its most common scheduled departure was 19:35, used on 73 of 319 flights, with 19:48 (35 flights) and 19:59 (32 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 19:3573 flights22.9%
- Departs 19:4835 flights11.0%
- Departs 19:5932 flights10.0%
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 19:35 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and OO 4087 runs 21 points better at 88.9%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Against the route
OO 4087 next to SAN to LAX
Every carrier on SAN to LAX combined arrived on time 89.2% of the time across 2,441 flights, so OO 4087 is about level with it. SkyWest flew 2,254 flights on the same city pair under all its flight numbers, including this one, and those ran 89.0% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4087thin sample | 319 | 88.9% | 75 min | 0.94% | A+ |
| All SkyWest Airlines on SAN–LAX | 2,254 | 89.0% | 77 min | 1.02% | A |
| All carriers on SAN–LAX | 2,441 | 89.2% | 77 min | 0.94% | A+ |
| SkyWest Airlines, whole network | 852,935 | 79.0% | 88 min | 1.77% | B |
Across the year
OO 4087 quarter by quarter
OO 4087 did not run the same all year. Its best quarter was Jul–Sep 2025 at 95.5% on time and its weakest Oct–Dec 2025 at 82.2%, a swing of 13 points on roughly 80 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 202590 flights95.5%
- Oct–Dec 202575 flights82.2%
- Jan–Mar 202674 flights85.1%
- Apr–Jun 202680 flights91.2%
Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, OO 4087 did best on Tuesday at 96.0% on time and worst on Friday at 77.6%. Each day rests on about 46 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Delay causes
Why OO 4087 runs late
One category carries most of the weight here. Carrier accounts for 66% of the 2,613 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.
- 66%Carrier
- 26%National Airspace System
- 8%Extreme weather
The largest share of delay minutes, 66%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,730 of the 2,613 delay minutes reported here. The split is drawn from 2,613 delay minutes reported on OO 4087.
Cancellations sit at 0.94% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 3.5% 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 4087 is not only a SAN to LAX flight. It also flew LAX to SAN (318 flights, 83.5% 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. 319 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 |
|---|---|---|---|---|---|
| LAX to SANthin sample | 318 | 83.5% | 51 min | 0.63% | B+ |
What to do with this
Booking OO 4087
For a booking, OO 4087 has one of the better records a US domestic flight can show: 88.9% on time and 0.94% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- SAN to LAX, every carrier and departure
- LAX to SAN, the return direction
- SkyWest Airlines 3743 on the same route94.5%
- SkyWest Airlines 4018 on the same route84.9%
- San Diego International (SAN) 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.