Charles M. Schulz - Sonoma County in June 2026

80.2%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 June 2026, reporting carriers scheduled 595 domestic departures from Charles M. Schulz - Sonoma County (STS). 80.2% left less than 15 minutes late and 80.0% reached their destination on time; 0.3% were cancelled.

Nationally that month, 72.2% of flights departed on time and 72.8% arrived on time, so STS departures were 8.0 points above the national departure figure.

A year earlier, in June 2025, the airport had 404 departures with 72.5% leaving on time: a change of +7.7 points, with flights up 47%.

Flights arriving at STS that month were on time 78.0% of the time (596 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 56%, air carrier 28% and national aviation system 13%.

On time 80.0%
Arrived 15+ minutes late 19.3%
Cancelled 0.3%
Diverted 0.3%

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

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

Measure	Jun 2026	Jun 2025	STS, 12 months to Jul 2026	All reported flights, Jun 2026
Departed on time	80.2%	72.5%	80.4%	72.2%
Arrived on time	80.0%	69.3%	78.8%	72.8%
Cancelled	0.3%	0.7%	1.7%	1.6%
Average departure delay (late minutes only)	12.3 min	22.6 min	13.2 min	20.6 min
Scheduled departures a day	20	14	16	20,253
Scheduled departures	595	404	5,714	607,577

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	417	70%	82.5%	0.6 min	0.5%
WN Southwest Airlines	109	18%	75.2%	3.7 min	0.0%
AS Alaska Airlines	39	7%	87.2%	2.9 min	0.0%
AA American Airlines	30	5%	53.3%	46.4 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
STS–SAN	Santa Rosa to San Diego	116	74.1%	5.7 min	0.9%
STS–BUR	Santa Rosa to Burbank	88	87.5%	-6.8 min	0.0%
STS–LAX	Santa Rosa to Los Angeles	74	91.9%	-3.5 min	0.0%
STS–PDX	Santa Rosa to Portland	61	93.4%	-7.1 min	0.0%
STS–PHX	Santa Rosa to Phoenix	60	56.7%	21.0 min	1.7%
STS–SNA	Santa Rosa to Santa Ana	60	90.0%	-3.7 min	0.0%
STS–SEA	Santa Rosa to Seattle	42	83.3%	6.0 min	0.0%
STS–LAS	Santa Rosa to Las Vegas	39	71.8%	2.8 min	0.0%
STS–DFW	Santa Rosa to Dallas/Fort Worth	30	53.3%	46.4 min	0.0%
STS–ONT	Santa Rosa to Ontario	21	85.7%	2.5 min	0.0%
STS–DEN	Santa Rosa to Denver	4	75.0%	-5.2 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), June 2026.

Delay causes

BTS cause category	Share of delay minutes	National, Jun 2026	Minutes
Air carrier	28.0%	30.8%	1,858
Late-arriving aircraft	56.2%	42.1%	3,727
National Aviation System	12.6%	20.3%	833
Extreme weather	2.5%	6.7%	167
Security	0.6%	0.1%	42

6,627 delay minutes on 115 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 June 2026?

80.2% of 595 scheduled domestic departures left less than 15 minutes late, and 80.0% reached their destination on time. The national figures that month were 72.2% and 72.8%.

How does that compare with a year earlier?

In June 2025, 72.5% of 404 departures left on time and 0.7% were cancelled, against 80.2% and 0.3% in June 2026.

Provenance

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