Airports › California
Airport · 12 months to July 2026
Charles M. Schulz - Sonoma County: delays and on-time record
Santa Rosa, California
BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report. Data through July 2026; this is a monthly history, not live airport status.
Reporting carriers scheduled 5,714 domestic departures from Charles M. Schulz - Sonoma County (STS), Santa Rosa, in the 12 months to July 2026: about 16 a day to 12 destinations.
80.4% of those flights left the gate less than 15 minutes late, 4.3 points above the national departure figure of 76.1%. Flights arriving at STS were on time 80.4% of the time, 4.4 points above the national arrival figure of 76.0%.
1.7% of scheduled departures were cancelled (national: 1.8%), and the average departure delay, counting early and on-time departures as zero, was 13.2 min.
SkyWest Airlines is the largest reporting carrier at STS with 75% of departures. Among carriers with at least 120 departures, Envoy Air had the highest on-time arrival share for its STS departures (80.1%) and Alaska Airlines the lowest (77.6%).
On-time departures are up 2.5 points on the previous 12 months (77.9%).
Of the delay minutes that carriers assigned to a BTS cause category for flights leaving STS, late-arriving aircraft 47%, air carrier 26% and national aviation system 18%.
- On time 78.8%
- Arrived 15+ minutes late 19.2%
- Cancelled 1.7%
- Diverted 0.2%
As origin and as destination, against the nation
| Measure | Departures from STS | Arrivals at STS | All reported flights | STS departures, previous 12 months |
|---|---|---|---|---|
| Departed on time (less than 15 min late) | 80.4% | 81.2% | 76.1% | 77.9% |
| Arrived on time | 78.8% | 80.4% | 76.0% | 73.3% |
| Cancelled | 1.7% | 1.5% | 1.8% | 0.8% |
| Diverted | 0.2% | 0.9% | 0.3% | 0.3% |
| Average departure delay (late minutes only) | 13.2 min | 11.2 min | 17.4 min | 16.0 min |
| Arrival delay minutes per 100 flights | 1,350 | 1,050 | 1,684 | 1,767 |
| Scheduled flights | 5,714 | 5,717 | 7,043,858 | 4,269 |
12 months to July 2026. The first column follows flights that left STS; the second follows flights that landed there. Year on year, on-time departures moved +2.5 pts.
Airlines at STS
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| OO SkyWest Airlines | 4,276 | 75% | 79.4% | 5.5 min | 1.9% |
| MQ Envoy Air | 508 | 9% | 80.1% | 5.1 min | 0.4% |
| AS Alaska Airlines | 410 | 7% | 77.6% | 2.6 min | 2.7% |
| WN Southwest Airlines | 410 | 7% | 77.8% | 5.0 min | 0.2% |
| AA American Airlines | 110 | 2% | 58.2% | 30.4 min | 0.0% |
Departures from STS by reporting carrier, ordered by flights; on time means the flight reached its destination less than 15 minutes late. Green is at or above the airport's overall share of 78.8%. Carriers fly different routes at different hours, so the rows are not a like-for-like test.
Busiest routes from STS
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| STS–SAN | Santa Rosa to San Diego | 1,009 | 72.5% | 9.9 min | 3.0% |
| STS–SNA | Santa Rosa to Santa Ana | 745 | 79.3% | 9.1 min | 0.8% |
| STS–LAX | Santa Rosa to Los Angeles | 726 | 82.6% | 3.4 min | 2.8% |
| STS–PHX | Santa Rosa to Phoenix | 693 | 76.5% | 10.7 min | 0.4% |
| STS–BUR | Santa Rosa to Burbank | 671 | 79.1% | 0.0 min | 2.5% |
| STS–PDX | Santa Rosa to Portland | 609 | 89.3% | -5.4 min | 1.6% |
| STS–SEA | Santa Rosa to Seattle | 463 | 75.6% | 4.6 min | 1.3% |
| STS–LAS | Santa Rosa to Las Vegas | 346 | 80.1% | 6.5 min | 0.6% |
| STS–DFW | Santa Rosa to Dallas/Fort Worth | 186 | 68.3% | 17.6 min | 0.0% |
| STS–PSP | Santa Rosa to Palm Springs | 142 | 80.3% | 8.0 min | 2.1% |
The 10 busiest of 12 routes with reported flights. Routes with at least 10 flights a month have their own page.
Month by month
By scheduled departure hour
Among hours with at least 114 departures, 7 am to 8 am had the highest on-time share (87.3% of 727 flights) and 3 pm to 4 pm the lowest (68.4% of 282).
Delay causes
Cancellations by reported reason (97 in the period): air carrier 6%, weather 79%, national aviation system 14%, security 0%.
Checkpoint volumes
TSA publishes daily checkpoint passenger counts for the country as a whole, not for STS on its own. The national series through September 2026 is on the checkpoint volumes page.
Questions and answers
How often do flights leave STS on time?
80.4% of the 5,714 scheduled domestic departures in the 12 months to July 2026 left less than 15 minutes late; the national figure was 76.1%. 1.7% were cancelled.
How often do flights arrive at STS on time?
80.4% of 5,717 scheduled arrivals were on time by the BTS definition, against 76.0% nationally.
Which airline has the highest on-time share at STS?
Counting departures from STS and whether they reached their destination on time, Envoy Air had the highest share (80.1% of 508 flights), then SkyWest Airlines (79.4%) and Southwest Airlines (77.8%). Carriers fly different routes at different hours, so the figures are not a like-for-like test.
What causes delays at STS?
For departures from STS that reached their destination 15 or more minutes late, carriers attributed the delay minutes as follows: late-arriving aircraft 47%, air carrier 26%, national aviation system 18%, extreme weather 9%, security 0%.
What time of day has the highest on-time share at STS?
Departures scheduled from 7 am to 8 am local time left on time 87.3% of the time, the highest of any hour with enough flights to compare; 3 pm to 4 pm was lowest at 68.4%.
Is it getting better?
On-time departures for the 12 months to July 2026 were 80.4%, up 2.5 points on the previous 12 months (77.9%). The monthly chart shows each of the last 36 months, and each month has its own page.
Does this page show today's delays at STS?
No. BTS publishes on-time records about two months after the month ends, so this page is a monthly history through July 2026. For live conditions use the FAA airport status service or your airline.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987 to present), monthly files August 2023 to July 2026; airport name from the BTS airport lookup table. US government works in the public domain. Domestic scheduled flights by reporting carriers only: international flights, charters and smaller carriers are not in the source. Totals and averages only; no individual flight or aircraft is identified. See the methodology; report processing errors through corrections.