Flight number record

OO 3499

SkyWest Airlines · San Jose to San Diego

Route: SJC → SAN
Departs: 10:20
Flights: 285
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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, 6 points worse than the national rate of 77.6%. The late ones land roughly 45 minutes behind schedule. That rests on 285 flights, with a median arrival 2 minutes early.

The national on-time rate over the same period is 77.6%, so OO 3499 runs 6 points behind the country as a whole. Across a thousand flights that is about 58 extra late arrivals.

On time

71.8%

Arrivals under 15 minutes late, of 284 completed flights

Avg delay

46 min

Across delayed arrivals only, not all flights

Cancelled

0.35%

National rate is 1.81%

1 hour+ late

6.0%

National rate is 8.1%

These figures cover 285 flights between July 2025 and June 2026. The median arrival is 2 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 3499 flies

OO 3499 flies SJC to SAN without a single fixed slot. Its most common scheduled departure was 10:20, used on 75 of 285 flights, with 10:35 (30 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 10:2075 flights26.3%
Departs 10:3530 flights10.5%

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 10:20 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and OO 3499 runs 12 points worse at 71.8%. 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 3499 next to SJC to SAN

Every carrier on SJC to SAN combined arrived on time 72.4% of the time across 4,979 flights, so OO 3499 is about level with it. SkyWest flew 1,166 flights on the same city pair under all its flight numbers, including this one, and those ran 77.1% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 7 points.

OO 3499 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3499thin sample	285	71.8%	46 min	0.35%	C+
All SkyWest Airlines on SJC–SAN	1,166	77.1%	49 min	1.20%	B
All carriers on SJC–SAN	4,979	72.4%	46 min	1.02%	C
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 3499 quarter by quarter

OO 3499 did not run the same all year. Its best quarter was Jan–Mar 2026 at 80.0% on time and its weakest Oct–Dec 2025 at 60.8%, a swing of 19 points on roughly 71 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 202585 flights76.5%
Oct–Dec 202580 flights60.8%
Jan–Mar 202635 flights80.0%
Apr–Jun 202685 flights74.1%

Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, OO 3499 did best on Tuesday at 87.5% on time and worst on Friday at 48.9%. Each day rests on about 41 flights, so a gap of 39 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 3499 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 3,701 reported delay minutes.

National Airspace System
39%
Carrier
31%
Late-arriving aircraft
24%
Extreme weather
6%

39% 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 1,427 minutes out of 3,701, against a national NAS share of 21%. The split is drawn from 3,701 delay minutes reported on OO 3499.

Cancellations are rare at 0.35%, below the national 1.81% 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

6.0% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last roughly 45 minutes, which a normal layover absorbs.

Every one of the 285 flights under OO 3499 in the data flew SJC to SAN. The number was not reused on any other city pair, which makes this a clean record of one route.

One caution: this is a thin sample. 285 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 71.8% on time with 0.35% cancelled over 285 flights. Those are rates from the past twelve months, not a forecast for any particular 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