Charles M. Schulz - Sonoma County in September 2023

83.4%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 September 2023, reporting carriers scheduled 344 domestic departures from Charles M. Schulz - Sonoma County (STS). 83.4% left less than 15 minutes late and 79.7% reached their destination on time; 0.0% were cancelled.

Nationally that month, 80.5% of flights departed on time and 80.1% arrived on time, so STS departures were 2.9 points above the national departure figure.

Flights arriving at STS that month were on time 81.7% of the time (344 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 68%, air carrier 23% and national aviation system 6%.

On time 79.7%
Arrived 15+ minutes late 20.1%
Cancelled 0.0%
Diverted 0.3%

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

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

Measure	Sep 2023	Year earlier	STS, 12 months to Jul 2026	All reported flights, Sep 2023
Departed on time	83.4%	—	80.4%	80.5%
Arrived on time	79.7%	—	78.8%	80.1%
Cancelled	0.0%	—	1.7%	1.2%
Average departure delay (late minutes only)	9.3 min	—	13.2 min	14.1 min
Scheduled departures a day	12	—	16	18,978
Scheduled departures	344	—	5,714	569,338

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	246	72%	76.8%	7.2 min	0.0%
MQ Envoy Air	63	18%	85.7%	0.1 min	0.0%
AS Alaska Airlines	35	10%	88.6%	1.3 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
STS–SEA	Santa Rosa to Seattle	60	86.7%	2.9 min	0.0%
STS–SNA	Santa Rosa to Santa Ana	59	67.8%	17.5 min	0.0%
STS–LAX	Santa Rosa to Los Angeles	57	70.2%	8.2 min	0.0%
STS–SAN	Santa Rosa to San Diego	56	78.6%	7.5 min	0.0%
STS–PHX	Santa Rosa to Phoenix	54	85.2%	-2.9 min	0.0%
STS–DFW	Santa Rosa to Dallas/Fort Worth	30	90.0%	-1.0 min	0.0%
STS–BUR	Santa Rosa to Burbank	28	89.3%	-2.8 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), September 2023.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2023	Minutes
Air carrier	23.0%	36.4%	759
Late-arriving aircraft	67.8%	38.3%	2,234
National Aviation System	5.9%	19.9%	194
Extreme weather	3.2%	5.1%	106
Security	0.0%	0.2%	0

3,293 delay minutes on 69 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 September 2023?

83.4% of 344 scheduled domestic departures left less than 15 minutes late, and 79.7% reached their destination on time. The national figures that month were 80.5% and 80.1%.

How does that compare with a year earlier?

September 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 September 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.