Carrier route record
OOSJC→SAN
SkyWest Airlines · San Jose to San Diego
- Flights
- 1,166
- Period
- July 2025 to June 2026
- Share of route
- 23%
- Carriers
- 4
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with SkyWest Airlines.
SkyWest on SJC to SAN lands a B, level with the national rate of 77.6%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by about 50 minutes on average. That is a workable record, not a spotless one. That rests on 1,166 flights, with a median arrival 4 minutes early.
The US average over the same twelve months is 77.6%, so there is little to separate SkyWest on SJC to SAN from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
77.1%
Arrivals under 15 minutes late, of 1,150 completed flights
Avg delay
49 min
Across delayed arrivals only, not all flights
Cancelled
1.20%
National rate is 1.81%
Whole route
72.4%
Every carrier on SJC to SAN, 4,979 flights
These figures cover 1,166 flights between July 2025 and June 2026. The median arrival is 4 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.
Carrier by carrier
SkyWest against every carrier on SJC to SAN
SkyWest flew 1,166 of the 4,979 flights on SJC to SAN, about 23% of it. Its 77.1% on time is 5 points better than the route as a whole, which runs 72.4%. Ranked by on-time rate it is number two of four carriers on the route, where the range runs from Alaska at 91.8% to Southwest at 70.7%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Alaska Airlinesthin sample | 49 | 91.8% | 63 min | 0.00% | A+ |
| SkyWest Airlines (this page) | 1,166 | 77.1% | 49 min | 1.20% | B |
| Spirit Airlinesthin sample | 24 | 70.8% | 62 min | 0.00% | C+ |
| Southwest Airlines | 3,740 | 70.7% | 45 min | 0.99% | C+ |
Flight by flight
SkyWest flight numbers on SJC to SAN
Departure window
When SkyWest runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 17 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am269 flights87.1%
- 8am–11am300 flights70.6%
- 11am–2pm91 flights80.0%
- 2pm–5pm193 flights73.5%
- 5pm–8pm247 flights78.2%
- 8pm–5am66 flights69.7%
Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 87.1% of the time, against 69.7% for the overnight window. That is 17 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 300 flights scheduled in it.
Across the year
SkyWest on SJC to SAN through the year
December is the weak month at 66.7% on time, against 90.0% in February. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. November was the busiest month here, with 147 flights.
Across the week, Tuesday is the strongest day at 88.4% on time and Friday the weakest at 64.5%. 24 points is a smaller lever than departure hour, but it is free.
Delay causes
Why SkyWest runs late on this route
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 13,000 reported delay minutes.
- 34%National Airspace System
- 30%Carrier
- 27%Late-arriving aircraft
- 9%Extreme weather
34% 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 4,461 minutes out of 13,000, against a national NAS share of 21%. The split is drawn from 12,999 reported delay minutes.
Cancellations sit at 1.20% against a national 1.81%, which is ordinary. Diversions add another 0.17%.
Connections and stage length
What a delay here costs
5.1% 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 50 minutes, which a normal layover absorbs.
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 5am–8am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 82.9% on time across 1,140 flights, 6 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 6 points of difference.
The sample behind these figures is 1,166 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
What to do with this
Booking SkyWest on SJC to SAN
Put together: the calendar is the biggest lever here, not the carrier or the hour. February runs 90.0% on time and December 66.7%, a swing of 23 points. If the dates move at all, move them out of December before you think about anything else. 1,150 completed flights over 12 months sit behind that.
Related
Where to go next
- SJC to SAN, every carrier
- SkyWest on SAN to SJC, the return leg
- Southwest Airlines on SJC to SAN70.7%
- SkyWest Airlines network-wide record
- Norman Y. Mineta San Jose International (SJC) delay statistics
- San Diego International (SAN) delay statistics
- The best time of day to fly, according to 7.04 million flight records
- Worst months to fly in the US, ranked by the data
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.