How reliable is Charles M. Schulz Sonoma County Airport?
Flights from STS departed within 15 minutes of schedule in 83% of 26,190 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 STS looks like
On-time departures
across 26,190 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 Santa Rosa
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 · 91/100 favorability
Roughest month
Most disruptive — low visibility & fog, freezing conditions · 64/100 favorability
The read on STS
What the numbers say about flying through Charles M. Schulz Sonoma County Airport
Across official performance history, flights from Santa Rosa left within 15 minutes of schedule about 83% of the time over 26,190 flights. That's a solid, better-than-average operational record. Pair it with a moderate cancellation rate of 1.5%. When a departure does run late, the typical delay is around 9 minutes.
On weather, Santa Rosa is a generally calm-weather airport, with a rougher stretch to watch. June is the calmest stretch for flying, scoring 91 out of 100 for favorable conditions, while December is the most disruptive at 64, driven mainly by low visibility & fog and freezing conditions. The seasonal swing is real but manageable; favor the calmer months when your dates are flexible.
None of this guarantees your specific flight — it’s the backdrop. To turn it into a booking, score real flights to Santa Rosa, 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 STS
- How reliable is Charles M. Schulz Sonoma County Airport (STS)?
- Flights from Santa Rosa left within 15 minutes of schedule roughly 83% of the time across 26,190 flights of official history — a solid, better-than-average operational record. The cancellation rate runs about 1.5%. It's advisory context, not a guarantee for any single flight.
- What is the best month to fly from STS for good weather?
- June has the calmest flying weather at Charles M. Schulz Sonoma County Airport. December is the most disruptive, mainly from low visibility & fog and freezing conditions.
Planning a trip through Santa Rosa?
Score real flights to and from STS on reliability, weather, and connection safety — not just price.