Charles M. Schulz - Sonoma County in July 2025

71.4%departed on time

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.

In July 2025, reporting carriers scheduled 385 domestic departures from Charles M. Schulz - Sonoma County (STS). 71.4% left less than 15 minutes late and 69.4% reached their destination on time; 0.3% were cancelled.

Nationally that month, 69.7% of flights departed on time and 69.0% arrived on time, so STS departures were 1.7 points above the national departure figure.

A year earlier, in July 2024, the airport had 319 departures with 82.8% leaving on time: a change of −11.4 points, with flights up 21%.

Flights arriving at STS that month were on time 67.0% of the time (385 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 51%, late-arriving aircraft 34% and national aviation system 14%.

On time 69.4%
Arrived 15+ minutes late 30.1%
Cancelled 0.3%
Diverted 0.3%

Every scheduled departure from STS in July 2025, judged by arrival at the destination.

July 2025 against a year earlier, the airport's year and the nation

Measure	Jul 2025	Jul 2024	STS, 12 months to Jul 2026	All reported flights, Jul 2025
Departed on time	71.4%	82.8%	80.4%	69.7%
Arrived on time	69.4%	76.5%	78.8%	69.0%
Cancelled	0.3%	0.3%	1.7%	2.5%
Average departure delay (late minutes only)	27.6 min	14.0 min	13.2 min	24.3 min
Scheduled departures a day	13	11	16	21,048
Scheduled departures	385	319	5,714	631,428

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	295	77%	75.6%	12.8 min	0.0%
AA American Airlines	60	16%	61.7%	71.6 min	0.0%
AS Alaska Airlines	30	8%	23.3%	31.1 min	3.3%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
STS–SNA	Santa Rosa to Santa Ana	62	62.9%	15.7 min	0.0%
STS–LAX	Santa Rosa to Los Angeles	61	73.8%	11.1 min	0.0%
STS–PHX	Santa Rosa to Phoenix	61	62.3%	31.9 min	0.0%
STS–SAN	Santa Rosa to San Diego	61	85.2%	4.0 min	0.0%
STS–SEA	Santa Rosa to Seattle	61	55.7%	20.5 min	1.6%
STS–DFW	Santa Rosa to Dallas/Fort Worth	31	54.8%	119.9 min	0.0%
STS–PDX	Santa Rosa to Portland	31	96.8%	0.9 min	0.0%
STS–BUR	Santa Rosa to Burbank	17	70.6%	12.4 min	0.0%

By scheduled departure hour

100

On-time share:under 62%6270768288% and over

Share of departures that left less than 15 minutes late, by scheduled hour (local time), July 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Jul 2025	Minutes
Air carrier	51.0%	31.1%	5,194
Late-arriving aircraft	33.7%	40.8%	3,431
National Aviation System	13.9%	20.7%	1,417
Extreme weather	1.4%	7.3%	140
Security	0.0%	0.1%	0

10,182 delay minutes on 116 flights that arrived 15 or more minutes late and carried a cause report. Carriers assign the categories; see what each category means.

Questions and answers

How many flights left STS on time in July 2025?

71.4% of 385 scheduled domestic departures left less than 15 minutes late, and 69.4% reached their destination on time. The national figures that month were 69.7% and 69.0%.

How does that compare with a year earlier?

In July 2024, 82.8% of 319 departures left on time and 0.3% were cancelled, against 71.4% and 0.3% in July 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for July 2025; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for STS · methodology · corrections.