OnTimeRoutes
B

Charles M. Schulz Sonoma County Airport (STS) delays & on-time performance

Santa Rosa, California · 12 nonstop destinations · 5 airlines · Aug 2025 – Jul 2026

Live status todayFAA update Oct 11, 4:56 AM EDTAll US airport delays now →

No FAA-reported ground stops or delays at STS right now. Individual flights can still be delayed by the airline; check with your airline for your flight.

On-time arrivals
80%
arrived < 15 min late
Cancelled
1.7%
97 flights
Avg arrival delay
14 min
65 min when late
Departed on time
82%
avg taxi-out 17 min

Figures cover 5,714 departures from STS; on-time is measured at arrival. Arrivals into STS were on time 82% of the time.

Key facts

  • Flights departing Charles M. Schulz Sonoma County Airport (STS) arrived on time 80% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
  • 1.7% were cancelled, and 7% arrived an hour or more late.
  • SkyWest Airlines was the most punctual airline here (81% on time); Southwest Airlines was the least (78%).
  • Departures scheduled around 6am did best (90% on time); around 8pm did worst (67%).
  • The largest source of delay minutes was late-arriving aircraft (47%).

Most delayed routes from STS

Lowest on-time arrival rates among regularly flown routes.

All 12 routes from STS →

Most reliable routes from STS

Highest on-time arrival rates among regularly flown routes.

Best airline at STS

Departures from this airport, ranked by on-time arrival.

AirlineOn timeCancelledAvg delayRoutesFlights
SkyWest Airlines81%1.9%14 min104,276
Envoy Air81%0.4%12 min2508
Alaska Airlines80%2.7%11 min3410
Southwest Airlines78%0.2%14 min4410
American Airlines62%0.0%36 min2110

Best time to fly out of STS

On-time arrival rate by scheduled departure hour (local time).

  • 6am90%388 flts
  • 7am88%727 flts
  • 8am81%73 flts
  • 9am78%276 flts
  • 10am79%304 flts
  • 11am83%459 flts
  • 12pm82%637 flts
  • 1pm70%251 flts
  • 2pm79%636 flts
  • 3pm74%282 flts
  • 4pm80%629 flts
  • 5pm80%229 flts
  • 6pm81%270 flts
  • 7pm73%393 flts
  • 8pm67%140 flts

Monthly trend

50%75%100%July 2025: 69.7% on time, 0.3% cancelledJul ’25August 2025: 78.2% on time, 0.5% cancelledAug ’25September 2025: 80.8% on time, 0.6% cancelledSep ’25October 2025: 82.0% on time, 1.0% cancelledOct ’25November 2025: 77.1% on time, 3.5% cancelledNov ’25December 2025: 65.9% on time, 8.9% cancelledDec ’25January 2026: 80.8% on time, 5.2% cancelledJan ’26February 2026: 85.0% on time, 0.9% cancelledFeb ’26March 2026: 85.7% on time, 0.2% cancelledMar ’26April 2026: 84.1% on time, 0.0% cancelledApr ’26May 2026: 83.6% on time, 0.3% cancelledMay ’26June 2026: 80.5% on time, 0.3% cancelledJun ’26July 2026: 78.8% on time, 1.3% cancelledJul ’26
On-time arrival rate by month. Hover a bar for exact figures.

Why departures were late

  • Late-arriving aircraft47%
  • Airline (crew, maintenance, cleaning, fueling)26%
  • Air traffic control & airport congestion18%
  • Extreme weather9%
  • Security0%

Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. How we calculate this.