Charles M. Schulz - Sonoma County in July 2026

79.3%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 2026, reporting carriers scheduled 629 domestic departures from Charles M. Schulz - Sonoma County (STS). 79.3% left less than 15 minutes late and 77.6% reached their destination on time; 1.3% were cancelled.

Nationally that month, 68.8% of flights departed on time and 69.4% arrived on time, so STS departures were 10.5 points above the national departure figure.

A year earlier, in July 2025, the airport had 385 departures with 71.4% leaving on time: a change of +7.9 points, with flights up 63%.

Flights arriving at STS that month were on time 76.9% of the time (629 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 49%, air carrier 35% and national aviation system 16%.

On time 77.6%
Arrived 15+ minutes late 20.8%
Cancelled 1.3%
Diverted 0.3%

Every scheduled departure from STS in July 2026, judged by arrival at the destination.

July 2026 against a year earlier, the airport's year and the nation

Measure	Jul 2026	Jul 2025	STS, 12 months to Jul 2026	All reported flights, Jul 2026
Departed on time	79.3%	71.4%	80.4%	68.8%
Arrived on time	77.6%	69.4%	78.8%	69.4%
Cancelled	1.3%	0.3%	1.7%	2.6%
Average departure delay (late minutes only)	12.6 min	27.6 min	13.2 min	24.1 min
Scheduled departures a day	21	13	16	21,066
Scheduled departures	629	385	5,714	631,970

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	425	68%	83.1%	-0.9 min	1.6%
WN Southwest Airlines	114	18%	71.1%	10.9 min	0.9%
AS Alaska Airlines	31	5%	74.2%	4.9 min	0.0%
AA American Airlines	30	5%	56.7%	21.8 min	0.0%
MQ Envoy Air	29	5%	48.3%	18.6 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
STS–SAN	Santa Rosa to San Diego	111	66.7%	15.4 min	5.4%
STS–BUR	Santa Rosa to Burbank	92	84.8%	-5.3 min	0.0%
STS–LAX	Santa Rosa to Los Angeles	85	85.9%	0.4 min	1.2%
STS–PDX	Santa Rosa to Portland	62	96.8%	-14.7 min	1.6%
STS–PHX	Santa Rosa to Phoenix	61	60.7%	12.3 min	0.0%
STS–SEA	Santa Rosa to Seattle	61	75.4%	4.0 min	0.0%
STS–SNA	Santa Rosa to Santa Ana	61	80.3%	2.0 min	0.0%
STS–LAS	Santa Rosa to Las Vegas	31	71.0%	9.0 min	0.0%
STS–ONT	Santa Rosa to Ontario	31	90.3%	-1.6 min	0.0%
STS–DFW	Santa Rosa to Dallas/Fort Worth	30	56.7%	21.8 min	0.0%
STS–DEN	Santa Rosa to Denver	4	100.0%	-11.2 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 2026.

Delay causes

BTS cause category	Share of delay minutes	National, Jul 2026	Minutes
Air carrier	34.8%	31.7%	2,473
Late-arriving aircraft	48.7%	41.8%	3,457
National Aviation System	15.8%	19.9%	1,125
Extreme weather	0.6%	6.5%	43
Security	0.0%	0.1%	0

7,098 delay minutes on 131 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 2026?

79.3% of 629 scheduled domestic departures left less than 15 minutes late, and 77.6% reached their destination on time. The national figures that month were 68.8% and 69.4%.

How does that compare with a year earlier?

In July 2025, 71.4% of 385 departures left on time and 0.3% were cancelled, against 79.3% and 1.3% in July 2026.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for July 2026; 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.