How reliable is Norman Y. Mineta San Jose International Airport?
Flights from SJC departed within 15 minutes of schedule in 84% of 294,167 flights in official BTS history — and weather is calmest in Jun. Here’s the full picture before you book.
Reliability score
on-time, cancellations & delays
Weather favorability
year-round climate
Origin-airport operations
What the departure punctuality at SJC looks like
On-time departures
across 294,167 flights
Source: BTS Airport Operations · data through 2026-06-25. Role-specific BTS departure history; advisory context, not a guarantee for any flight.
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Weather by month
When the weather works for you at San Jose
A calm-weather score (0–100) for each month from decades of airport observations — how often conditions disrupt flying, not temperature. Higher is calmer.
Calmest month
Calmest flying weather of the year · 100/100 favorability
Roughest month
Most disruptive — low visibility & fog, high winds · 90/100 favorability
The read on SJC
What the numbers say about flying through Norman Y. Mineta San Jose International Airport
Across official performance history, flights from San Jose left within 15 minutes of schedule about 84% of the time over 294,167 flights. That's a solid, better-than-average operational record. Pair it with a low cancellation rate of 1.0%, so flights here rarely vanish outright. When a departure does run late, the typical delay is around 6 minutes.
On weather, San Jose is an unusually calm-weather airport year-round. June is the calmest stretch for flying, scoring 100 out of 100 for favorable conditions, while December is the most disruptive at 90, driven mainly by low visibility & fog and high winds. The year is relatively steady, so no single month stands out as one to avoid on weather alone.
None of this guarantees your specific flight — it’s the backdrop. To turn it into a booking, score real flights to San Jose, read how we weigh it all in how the PlaneSane Score works, and brush up with how to pick a reliable flight and avoiding weather delays.
Common questions about SJC
- How reliable is Norman Y. Mineta San Jose International Airport (SJC)?
- Flights from San Jose left within 15 minutes of schedule roughly 84% of the time across 294,167 flights of official history — a solid, better-than-average operational record. The cancellation rate runs about 1.0%. It's advisory context, not a guarantee for any single flight.
- What is the best month to fly from SJC for good weather?
- June has the calmest flying weather at Norman Y. Mineta San Jose International Airport. December is the most disruptive, mainly from low visibility & fog and high winds.
Planning a trip through San Jose?
Score real flights to and from SJC on reliability, weather, and connection safety — not just price.