Charles M. Schulz - Sonoma County in August 2023

83.2%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 August 2023, reporting carriers scheduled 315 domestic departures from Charles M. Schulz - Sonoma County (STS). 83.2% left less than 15 minutes late and 79.7% reached their destination on time; 0.3% were cancelled.

Nationally that month, 76.7% of flights departed on time and 76.9% arrived on time, so STS departures were 6.5 points above the national departure figure.

Flights arriving at STS that month were on time 78.1% of the time (315 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 83%, air carrier 9% and national aviation system 7%.

On time 79.7%
Arrived 15+ minutes late 20.0%
Cancelled 0.3%
Diverted 0.0%

Every scheduled departure from STS in August 2023, judged by arrival at the destination.

August 2023 against a year earlier, the airport's year and the nation

Measure	Aug 2023	Year earlier	STS, 12 months to Jul 2026	All reported flights, Aug 2023
Departed on time	83.2%	—	80.4%	76.7%
Arrived on time	79.7%	—	78.8%	76.9%
Cancelled	0.3%	—	1.7%	1.5%
Average departure delay (late minutes only)	12.1 min	—	13.2 min	17.3 min
Scheduled departures a day	11	—	16	20,100
Scheduled departures	315	—	5,714	602,987

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	174	55%	78.2%	13.7 min	0.6%
MQ Envoy Air	79	25%	88.6%	-6.8 min	0.0%
AS Alaska Airlines	62	20%	72.6%	9.7 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
STS–SEA	Santa Rosa to Seattle	62	72.6%	9.7 min	0.0%
STS–SNA	Santa Rosa to Santa Ana	58	72.4%	16.7 min	0.0%
STS–LAX	Santa Rosa to Los Angeles	48	81.3%	12.6 min	2.1%
STS–PHX	Santa Rosa to Phoenix	48	91.7%	-8.9 min	0.0%
STS–SAN	Santa Rosa to San Diego	48	81.3%	8.6 min	0.0%
STS–DFW	Santa Rosa to Dallas/Fort Worth	31	83.9%	-3.5 min	0.0%
STS–BUR	Santa Rosa to Burbank	17	76.5%	24.2 min	0.0%
STS–PDX	Santa Rosa to Portland	3	100.0%	-7.0 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), August 2023.

Delay causes

BTS cause category	Share of delay minutes	National, Aug 2023	Minutes
Air carrier	9.3%	36.7%	356
Late-arriving aircraft	83.1%	42.2%	3,185
National Aviation System	7.1%	15.7%	271
Extreme weather	0.6%	5.1%	23
Security	0.0%	0.2%	0

3,835 delay minutes on 63 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 August 2023?

83.2% of 315 scheduled domestic departures left less than 15 minutes late, and 79.7% reached their destination on time. The national figures that month were 76.7% and 76.9%.

How does that compare with a year earlier?

August 2022 is outside the 36 months on file, or the airport had too few reported flights that month.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for August 2023; 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.