Flight number record
OO 4087
SkyWest Airlines · San Diego to Los Angeles
- Route
- SAN → LAX
- Departs
- 19:59
- Flights
- 320
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 a B+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 320 flights, with a median arrival 13 minutes early.
Set against the rest of the country, OO 4087's record is 8 points better than the US average of 77.3%. That gap is worth roughly 76 fewer late arrivals for every thousand flights.
Key figures
On time
84.9%
Arrivals under 15 minutes late, of 317 completed flights
Avg delay
62 min
Across delayed arrivals only, not all flights
Cancelled
0.94%
National rate is 1.89%
1 hour+ late
3.5%
National rate is 8.3%
These figures cover 320 flights between September 2025 and August 2026. The median arrival is 13 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 4087 flies
OO 4087 flies SAN to LAX without a single fixed slot. Its most common scheduled departure was 19:59, used on 60 of 320 flights, with 19:35 (42 flights) and 19:48 (35 flights) next.
- Departs 19:5960 flights18.8%
- Departs 19:3542 flights13.1%
- Departs 19:4835 flights10.9%
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 19:59 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and OO 4087 runs 17 points better at 84.9%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
OO 4087 next to SAN to LAX
Every carrier on SAN to LAX combined arrived on time 87.4% of the time across 2,452 flights, so OO 4087 is 3 points behind it. SkyWest flew 2,163 flights on the same city pair under all its flight numbers, including this one, and those ran 87.2% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4087thin sample | 320 | 84.9% | 62 min | 0.94% | B+ |
| All SkyWest Airlines on SAN–LAX | 2,163 | 87.2% | 70 min | 1.06% | A |
| All carriers on SAN–LAX | 2,452 | 87.4% | 71 min | 0.94% | A+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4087 quarter by quarter
OO 4087 did not run the same all year. Its best quarter was Apr–Jun 2026 at 91.2% on time and its weakest Jul–Sep 2026 at 78.7%, 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 202530 flights—
- Oct–Dec 202575 flights82.2%
- Jan–Mar 202674 flights85.1%
- Apr–Jun 202680 flights91.2%
- Jul–Sep 202661 flights78.7%
Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, OO 4087 did best on Tuesday at 93.9% on time and worst on Friday at 73.5%. Each day rests on about 46 flights, so a gap of 20 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4087 runs when it is late
OO 4087 often beats the schedule: 138 of 317 completed flights, 44%, arrived 15 minutes or more early. The 48 late arrivals split 22 under half an hour, 15 between 30 and 60 minutes, and 11 an hour or more.
- 15+ min early138 flights43.5%
- Within 15 min131 flights41.3%
- 15–29 min late22 flights6.9%
- 30–59 min late15 flights4.7%
- 1–2 hours late8 flights2.5%
- 2+ hours late3 flights0.9%
Scale runs 0% to 100%.
Share of 317 completed flights by arrival against schedule.
14 of 53 late departures made up the time and arrived on time, 26% of them. 9 flights left on time and still arrived late.
The worst days
Worst days for OO 4087
The latest arrival of the period was on 16 February 2026, 15 hours 33 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 16 February 2026 | 15 hours 33 minutes | Carrier |
| 15 January 2026 | 3 hours 10 minutes | National Airspace System |
| 12 June 2026 | 2 hours 29 minutes | Carrier |
| 17 February 2026 | 1 hour 39 minutes | Carrier |
| 12 October 2025 | 1 hour 36 minutes | Carrier |
Delay causes
Why OO 4087 runs late
Carrier accounts for 60% of the 2,989 delay minutes carriers reported here, and the remaining four split what is left.
- 60%Carrier
- 28%National Airspace System
- 12%Extreme weather
Extreme weather accounts for 12% 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 2.0 times the usual weather exposure. The split is drawn from 2,989 delay minutes reported on OO 4087.
Cancellations sit at 0.94% against a national 1.89%, 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 8.3% 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 4087 is not only a SAN to LAX flight. It also flew LAX to SAN (319 flights, 79.5% 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. 320 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 | 319 | 79.5% | 49 min | 0.63% | B+ |
What to do with this
Booking OO 4087
For a booking, read OO 4087 as 84.9% on time with 0.94% cancelled over 320 flights. Those are rates from the past twelve months, not a forecast for any particular 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%
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.