Carrier route record
ASSAN→SJC
Alaska Airlines · San Diego to San Jose
- Flights
- 109
- Period
- September 2025 to August 2026
- Share of route
- 2%
- Carriers
- 3
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Alaska Airlines.
Alaska on SAN to SJC lands a B+, 3 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 30 minutes on average. That rests on 109 flights. The strongest carrier on the route with a full sample, SkyWest Airlines, flew 1,112 at 80.7% on time.
The US average over the same twelve months is 77.3%, so there is little to separate Alaska on SAN to SJC from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
80.6%
Arrivals under 15 minutes late, of 108 completed flights
Avg delay
32 min
Across delayed arrivals only, not all flights
Cancelled
0.92%
National rate is 1.89%
Whole route
74.5%
Every carrier on SAN to SJC, 4,973 flights
These figures cover 109 flights between September 2025 and August 2026. The median arrival is 3 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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Carrier by carrier
Alaska against every carrier on SAN to SJC
Alaska flew 109 of the 4,973 flights on SAN to SJC, about 2% of it. Its 80.6% on time is 6 points better than the route as a whole, which runs 74.5%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from SkyWest at 80.7% to Southwest at 72.6%.
The choice of carrier is not cosmetic here. SkyWest Airlines arrives on time 80.7% of the time; Southwest Airlines manages 72.6%. Sample sizes sit next to every figure, because a two-point gap across 3,752 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SkyWest Airlines | 1,112 | 80.7% | 56 min | 1.26% | B |
| Alaska Airlines (this page)thin sample | 109 | 80.6% | 32 min | 0.92% | B+ |
| Southwest Airlines | 3,752 | 72.6% | 49 min | 0.77% | C+ |
SkyWest leads Southwest by 8 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.
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Departure window
When Alaska runs best on this route
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 109 flights.
There are not enough flights in each departure window to split Alaska's SAN to SJC record by time of day without the percentages moving on noise. The headline rate of 80.6% is the reliable figure here.
Across the year
Alaska on SAN to SJC through the year
- Apr–Jun 202648 flights81.2%
- Jul–Sep 202661 flights80.0%
Scale runs 70% to 85%.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 80.6% on time across 109 flights.
Split by quarter, Alaska on SAN to SJC logged 48 flights in Apr–Jun 2026 and 61 flights in Jul–Sep 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 80.6% annual figure is the one to use.
Arrival by arrival
How late Alaska on SAN to SJC runs when it is late
Most of the lateness is short. 12 of the 21 late arrivals were under half an hour behind, and 1 reached an hour or more. Not one arrived two hours late.
- 15+ min early21 flights19.4%
- Within 15 min66 flights61.1%
- 15–29 min late12 flights11.1%
- 30–59 min late8 flights7.4%
- 1–2 hours late1 flights0.9%
- 2+ hours late0 flights0.0%
Scale runs 0% to 100%.
Share of 108 completed flights by arrival against schedule.
A late pushback is often recovered here: of 35 departures that left 15 minutes late or more, 15 still arrived on time. Only 1 left on time and still arrived late.
The worst days
Worst days for Alaska on SAN to SJC
The latest arrival of the period was on 23 August 2026, 1 hour 16 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. Three of the five worst days fell in May 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 23 August 2026 | 1 hour 16 minutes | Late-arriving aircraft |
| 28 May 2026 | 57 minutes | Late-arriving aircraft |
| 29 May 2026 | 43 minutes | Late-arriving aircraft |
| 21 June 2026 | 41 minutes | Late-arriving aircraft |
| 26 May 2026 | 39 minutes | Late-arriving aircraft |
Delay causes
Why Alaska runs late on this route
Late-arriving aircraft accounts for 71% of the 675 delay minutes carriers reported here, and the remaining four split what is left.
- 71%Late-arriving aircraft
- 22%Carrier
- 7%National Airspace System
71% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 675 reported delay minutes here, that single category outweighs weather by 71 to one. The split is drawn from 675 reported delay minutes.
Cancellations sit at 0.92% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and stage length
What a delay here costs
Badly late arrivals are rare here: only 0.9% 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.
At 417 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 8pm–5am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 83.6% on time across 111 flights, 3 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 3 points of difference.
One caution: this is a thin sample. 109 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 Alaska on SAN to SJC
Put together: treat all of this as provisional. 109 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 80.6% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 108 completed flights over 12 months sit behind that.
Related
Where to go next
- SAN to SJC, every carrier
- Alaska on SJC to SAN, the return leg
- SkyWest Airlines on SAN to SJC80.7%
- Southwest Airlines on SAN to SJC72.6%
- Alaska Airlines network-wide record
- San Diego International (SAN) delay statistics
- Norman Y. Mineta San Jose International (SJC) delay statistics
- Why the first flight of the morning is statistically safest
- How to read this site: grades, sample sizes, and honest caveats
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.