Charles M. Schulz - Sonoma County (STS) Delays and On-Time Departures
Santa Rosa, CA · ranked 128th of 333 airports for on-time departures
Data through July 2026 · Last updated October 18, 2026
81.8% of the 5,714 flights scheduled to depart Santa Rosa (STS) in the last 12 months left on time, 4.4 points above the US average of 77.4%.
That ranks 128th of 333 US airports tracked on this site, with 1.7% of departures cancelled.
Among airlines at Santa Rosa (STS), SkyWest Airlines left on time most often (83.2%).
Over 24 months, Tuesday was the most reliable day (85% on time) and December the worst month (70%).
Best time of day to fly out of Santa Rosa (STS)
On-time departure % by scheduled departure hour (local time), last 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 93.7% | 5.8% | 724 |
| 7am–8am | 91.5% | 3.6% | 1,040 |
| 8am–9am | 90.0% | 1.5% | 203 |
| 9am–10am | 77.8% | 0.9% | 327 |
| 10am–11am | 79.7% | 0.6% | 645 |
| 11am–12pm | 83.4% | 0.4% | 766 |
| 12pm–1pm | 76.5% | 0.1% | 1,110 |
| 1pm–2pm | 75.5% | 0.2% | 474 |
| 2pm–3pm | 75.7% | 0.5% | 1,064 |
| 3pm–4pm | 76.3% | 0.8% | 518 |
| 4pm–5pm | 80.3% | 0.2% | 1,083 |
| 5pm–6pm | 75.6% | 0.0% | 315 |
| 6pm–7pm | 79.1% | 1.3% | 712 |
| 7pm–8pm | 75.8% | 1.3% | 752 |
| 8pm–9pm | 64.6% | 1.7% | 230 |
| 9pm–10pm | Limited data | 20 | |
Airlines at STS ranked by on-time departures
Last 12 months. Airlines with fewer than 30 departures are marked “limited data”.
| Airline | On-time departures | On-time arrivals | Cancelled | Departures |
|---|---|---|---|---|
| SkyWest Airlines | 83.2% | 81.1% | 1.9% | 4,276 |
| Alaska Airlines | 82.5% | 79.7% | 2.7% | 410 |
| Envoy Air | 81.8% | 80.6% | 0.4% | 508 |
| Southwest Airlines | 72.4% | 78.0% | 0.2% | 410 |
| American Airlines | 60.9% | 62.1% | 0.0% | 110 |
80%+ good 70–79.9% fair <70% poor
Best day to fly out of STS
On-time departures by day, 24 months.
Best month to fly out of STS
On-time departures by month, 24 months.
Holiday travel at Santa Rosa (STS)
On-time departures during holiday periods compared with all other days, last 24 months.
| Period | On-time departures | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 77.8% | -3.9 pts | 5.6% | 215 |
| Christmas & New Year (Dec 20 - Jan 3) | 70.0% | -11.7 pts | 3.6% | 387 |
| Summer peak (Jun 15 - Aug 15) | 77.5% | -4.2 pts | 0.8% | 1,877 |
| All other days | 81.7% | — | 1.2% | 7,504 |
Monthly on-time departure trend at STS
On-time departure % each month, with the 12-month US average for reference.
Routes from Santa Rosa (STS)
Every route from STS with its own page, by number of flights (last 12 months, on-time arrivals).
| To | On time | Cancelled | Flights |
|---|---|---|---|
| STS → San Diego (SAN) | 74.9% | 3.0% | 1,009 |
| STS → Santa Ana (SNA) | 80.0% | 0.8% | 745 |
| STS → Los Angeles (LAX) | 85.0% | 2.8% | 726 |
| STS → Phoenix (PHX) | 76.9% | 0.4% | 693 |
| STS → Burbank (BUR) | 81.6% | 2.5% | 671 |
| STS → Portland (PDX) | 91.0% | 1.6% | 609 |
| STS → Seattle (SEA) | 76.6% | 1.3% | 463 |
| STS → Las Vegas (LAS) | 80.5% | 0.6% | 346 |
| STS → Dallas/Fort Worth (DFW) | 71.0% | 0.0% | 186 |