Flight number record

OO 3459

SkyWest Airlines · San Diego to San Jose

Route: SAN → SJC
Departs: 20:59
Flights: 261
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 3459, 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 3459 lands a B, 2 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about 55 minutes on average. That is a workable record, not a spotless one. That rests on 261 flights, with a median arrival 9 minutes early.

On time

79.3%

Arrivals under 15 minutes late, of 256 completed flights

Avg delay

55 min

Across delayed arrivals only, not all flights

Cancelled

1.92%

National rate is 1.81%

1 hour+ late

5.9%

National rate is 8.1%

These figures cover 261 flights between July 2025 and June 2026. The median arrival is 9 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 3459 flies

OO 3459 flies SAN to SJC without a single fixed slot. Its most common scheduled departure was 20:59, used on 122 of 261 flights, with 20:30 (35 flights) and 21:14 (33 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 20:59122 flights46.7%
Departs 20:3035 flights13.4%
Departs 21:1433 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 20:59 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and OO 3459 runs 9 points better at 79.3%. 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 3459 next to SAN to SJC

Every carrier on SAN to SJC combined arrived on time 77.6% of the time across 4,953 flights, so OO 3459 is 2 points ahead of it. SkyWest flew 1,140 flights on the same city pair under all its flight numbers, including this one, and those ran 82.9% on time. Across its whole network SkyWest Airlines managed 79.0%, close to this flight's figure.

OO 3459 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3459thin sample	261	79.3%	55 min	1.92%	B
All SkyWest Airlines on SAN–SJC	1,140	82.9%	54 min	1.14%	B
All carriers on SAN–SJC	4,953	77.6%	50 min	0.87%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 3459 quarter by quarter

Quarter by quarter OO 3459 held fairly steady: 79.1% in Jul–Sep 2025, 79.7% in Oct–Dec 2025, 81.1% in Jan–Mar 2026 and 75.8% in Apr–Jun 2026. A spread of 5 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights79.1%
Oct–Dec 202582 flights79.7%
Jan–Mar 202654 flights81.1%
Apr–Jun 202633 flights75.8%

Scale runs 65% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, OO 3459 did best on Wednesday at 96.9% on time and worst on Friday at 69.2%. Each day rests on about 37 flights, so a gap of 28 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 3459 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 43% of the 2,886 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.

Late-arriving aircraft
43%
Carrier
25%
National Airspace System
22%
Extreme weather
9%
Security
2%

43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 2,886 reported delay minutes here, that single category outweighs weather by 5 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 2,886 delay minutes reported on OO 3459.

Cancellations sit at 1.92% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

5.9% 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 about 55 minutes, which a normal layover absorbs.

The same number turns up on one other city pair in the data, including SBA to PDX (1), but none flew often enough under OO 3459 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SAN to SJC only.

One caution: this is a thin sample. 261 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 3459

For a booking, read OO 3459 as 79.3% on time with 1.92% cancelled over 261 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