SJC to SAN flight delays
San Jose, CA (SJC) San Diego, CA (SAN) · 417 miles
4,979 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
72.42%
Arrived on time
Within 15 minutes of schedule
1.02%
Cancelled
Share of scheduled flights
46 min
When late, late by
Average across delayed arrivals
14 min
Delay per flight
Averaged over every flight flown
What the record says about this route
Which airline you fly changes the odds here. SkyWest Airlines arrived on time 6.4 points more often than Southwest Airlines over the same period on the same route — same airports, same weather, same air traffic control. A gap that survives all of that is about how the two airlines are run.
The season swings this route hard. In January it ran 21.7 points more punctual than in June — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
This route does worse than its own airport. SJC as a whole runs 9.3 points more punctual than these flights, which points at something specific to the route — the time of day it is scheduled, or the aircraft that feed it — rather than the airport.
The two directions do not behave alike. SAN to SJC arrives on time 5.2 points more often than the outbound. Delay accumulates through the flying day, so whichever direction is scheduled later tends to carry the worse record — which is an argument for booking the morning departure if the choice exists.
Which airline should you fly on this route?
Over January 2025 – August 2026, SkyWest Airlines arrived on time most often on SJC to SAN. Southwest Airlines was late most often. Flights ran closest to schedule in January and worst in June.
Every airline on SJC to SAN
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Southwest Airlines | 3,740 | 70.71% | 0.99% | 45 min | D |
| SkyWest Airlines | 1,166 | 77.13% | 1.2% | 49 min | C |
| Alaska Airlines | 49 | 91.84% | 0% | 63 min | — |
| Spirit Airlines | 24 | 70.83% | 0% | 62 min | — |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
SAN to SJC San Diego back to San Jose 77.61% on time COther routes from San Jose
Common questions
Are flights from San Jose to San Diego usually delayed?
72.42% of flights on the SJC to SAN route arrived within 15 minutes of schedule, so roughly 3 in every ten arrived late. That is worse than the average route in this record.
Which airline is most on time from San Jose to San Diego?
SkyWest Airlines, at 77.13% on time across 1,166 flights. The least punctual on the route was Southwest Airlines at 70.71%.
How often are SJC to SAN flights cancelled?
1.02% of scheduled flights did not operate — about 10 in every thousand. That is in the normal range.
What is the best month to fly San Jose to San Diego?
January, when 81.4% of flights arrived on time. The worst was June at 59.7%.
When SJC to SAN flights are late, how late are they?
About 46 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on SJC to SAN during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →