Charles M. Schulz - Sonoma County in June 2025

72.5%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 2025, reporting carriers scheduled 404 domestic departures from Charles M. Schulz - Sonoma County (STS). 72.5% left less than 15 minutes late and 69.3% reached their destination on time; 0.7% were cancelled.

Nationally that month, 71.4% of flights departed on time and 70.3% arrived on time, so STS departures were 1.1 points above the national departure figure.

A year earlier, in June 2024, the airport had 287 departures with 76.3% leaving on time: a change of −3.8 points, with flights up 41%.

Flights arriving at STS that month were on time 69.4% of the time (405 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 49%, air carrier 33% and national aviation system 17%.

On time 69.3%
Arrived 15+ minutes late 29.5%
Cancelled 0.7%
Diverted 0.5%

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

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

Measure	Jun 2025	Jun 2024	STS, 12 months to Jul 2026	All reported flights, Jun 2025
Departed on time	72.5%	76.3%	80.4%	71.4%
Arrived on time	69.3%	71.8%	78.8%	70.3%
Cancelled	0.7%	0.0%	1.7%	1.6%
Average departure delay (late minutes only)	22.6 min	23.2 min	13.2 min	22.1 min
Scheduled departures a day	14	10	16	20,386
Scheduled departures	404	287	5,714	611,575

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	316	78%	74.4%	17.5 min	0.6%
AA American Airlines	54	13%	63.0%	15.7 min	1.9%
AS Alaska Airlines	30	7%	30.0%	38.7 min	0.0%
MQ Envoy Air	4	1%	50.0%	28.8 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
STS–LAX	Santa Rosa to Los Angeles	60	81.7%	3.7 min	0.0%
STS–PHX	Santa Rosa to Phoenix	60	71.7%	35.1 min	0.0%
STS–SEA	Santa Rosa to Seattle	60	50.0%	33.9 min	1.7%
STS–SNA	Santa Rosa to Santa Ana	60	76.7%	12.3 min	0.0%
STS–SAN	Santa Rosa to San Diego	59	69.5%	14.6 min	0.0%
STS–PDX	Santa Rosa to Portland	41	82.9%	9.1 min	0.0%
STS–DFW	Santa Rosa to Dallas/Fort Worth	30	50.0%	24.7 min	3.3%
STS–BUR	Santa Rosa to Burbank	23	65.2%	8.9 min	4.3%
STS–LAS	Santa Rosa to Las Vegas	11	63.6%	36.0 min	0.0%

By scheduled departure hour

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

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

Delay causes

BTS cause category	Share of delay minutes	National, Jun 2025	Minutes
Air carrier	32.6%	31.6%	2,871
Late-arriving aircraft	48.8%	40.6%	4,300
National Aviation System	17.0%	20.9%	1,496
Extreme weather	0.4%	6.9%	34
Security	1.2%	0.2%	102

8,803 delay minutes on 119 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 2025?

72.5% of 404 scheduled domestic departures left less than 15 minutes late, and 69.3% reached their destination on time. The national figures that month were 71.4% and 70.3%.

How does that compare with a year earlier?

In June 2024, 76.3% of 287 departures left on time and 0.0% were cancelled, against 72.5% and 0.7% in June 2025.

Provenance

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