Flight number record
OO 3499
SkyWest Airlines · San Jose to San Diego
- Route
- SJC → SAN
- Departs
- 09:09
- Flights
- 279
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 3499, 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 3499 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 7 points worse than the national rate of 77.3%. The late ones land about 45 minutes behind schedule. That rests on 279 flights, with a median arrival 1 minute early.
The national on-time rate over the same period is 77.3%, so OO 3499 runs 7 points behind the country as a whole. Across a thousand flights that is about 72 extra late arrivals.
Key figures
On time
70.1%
Arrivals under 15 minutes late, of 278 completed flights
Avg delay
44 min
Across delayed arrivals only, not all flights
Cancelled
0.36%
National rate is 1.89%
1 hour+ late
6.1%
National rate is 8.3%
These figures cover 279 flights between September 2025 and August 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.
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Schedule
When OO 3499 flies
OO 3499 flies SJC to SAN without a single fixed slot. Its most common scheduled departure was 09:09, used on 70 of 279 flights, with 10:35 (30 flights) and 10:22 (28 flights) next.
- Departs 09:0970 flights25.1%
- Departs 10:3530 flights10.8%
- Departs 10:2228 flights10.0%
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 09:09 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 3499 runs 14 points worse at 70.1%. 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 3499 next to SJC to SAN
Every carrier on SJC to SAN combined arrived on time 68.3% of the time across 5,004 flights, so OO 3499 is 2 points ahead of it. SkyWest flew 1,148 flights on the same city pair under all its flight numbers, including this one, and those ran 73.0% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 3499thin sample | 279 | 70.1% | 44 min | 0.36% | C+ |
| All SkyWest Airlines on SJC–SAN | 1,148 | 73.0% | 50 min | 1.39% | C |
| All carriers on SJC–SAN | 5,004 | 68.3% | 47 min | 1.06% | C |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 3499 quarter by quarter
OO 3499 did not run the same all year. Its best quarter was Jul–Sep 2025 at 86.7% on time and its weakest Oct–Dec 2025 at 60.8%, a swing of 26 points on roughly 56 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 flights86.7%
- Oct–Dec 202580 flights60.8%
- Jan–Mar 202635 flights80.0%
- Apr–Jun 202685 flights74.1%
- Jul–Sep 202649 flights61.2%
Scale runs 50% to 90%.
By weekday, OO 3499 did best on Tuesday at 81.6% on time and worst on Friday at 51.1%. Each day rests on about 40 flights, so a gap of 30 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 3499 runs when it is late
The 83 late arrivals split 33 under half an hour, 33 between 30 and 60 minutes, and 17 an hour or more.
- 15+ min early45 flights16.2%
- Within 15 min150 flights54.0%
- 15–29 min late33 flights11.9%
- 30–59 min late33 flights11.9%
- 1–2 hours late14 flights5.0%
- 2+ hours late3 flights1.1%
Scale runs 0% to 100%.
Share of 278 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 44 departures that left 15 minutes late or more, only 1 made it up before arrival. In the other direction, 40 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SAN.
The worst days
Worst days for OO 3499
The latest arrival of the period was on 18 September 2025, 3 hours 43 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. Three of the five worst days fell in November 2025.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 18 September 2025 | 3 hours 43 minutes | National Airspace System |
| 18 November 2025 | 2 hours 36 minutes | Late-arriving aircraft |
| 9 November 2025 | 2 hours 3 minutes | Late-arriving aircraft |
| 21 November 2025 | 1 hour 57 minutes | National Airspace System |
| 1 January 2026 | 1 hour 50 minutes | National Airspace System |
Delay causes
Why OO 3499 runs late
National Airspace System accounts for 47% of the 3,685 delay minutes carriers reported here, and the remaining four split what is left.
- 47%National Airspace System
- 26%Carrier
- 20%Late-arriving aircraft
- 6%Extreme weather
47% 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 1,738 minutes out of 3,685, against a national NAS share of 21%. The split is drawn from 3,685 delay minutes reported on OO 3499.
Cancellations are rare at 0.36%, 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
6.1% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about 45 minutes, which a normal layover absorbs.
The same number turns up on one other city pair in the data, including SNA to SFO (11), but none flew often enough under OO 3499 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SJC to SAN only.
One caution: this is a thin sample. 279 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 3499
For a booking, read OO 3499 as 70.1% on time with 0.36% cancelled over 279 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SJC to SAN, every carrier and departure
- SAN to SJC, the return direction
- Norman Y. Mineta San Jose International (SJC) delay statistics
- San Diego International (SAN) 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.