Charles M. Schulz - Sonoma County in September 2024

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 September 2024, reporting carriers scheduled 345 domestic departures from Charles M. Schulz - Sonoma County (STS). 83.2% left less than 15 minutes late and 77.7% reached their destination on time; 0.3% were cancelled.

Nationally that month, 84.4% of flights departed on time and 83.9% arrived on time, so STS departures were 1.2 points below the national departure figure.

A year earlier, in September 2023, the airport had 344 departures with 83.4% leaving on time: a change of −0.2 points, with flights up 0%.

Flights arriving at STS that month were on time 81.3% of the time (347 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 37%, national aviation system 29% and air carrier 17%.

On time 77.7%
Arrived 15+ minutes late 22.0%
Cancelled 0.3%
Diverted 0.0%

Every scheduled departure from STS in September 2024, judged by arrival at the destination.

September 2024 against a year earlier, the airport's year and the nation

Measure	Sep 2024	Sep 2023	STS, 12 months to Jul 2026	All reported flights, Sep 2024
Departed on time	83.2%	83.4%	80.4%	84.4%
Arrived on time	77.7%	79.7%	78.8%	83.9%
Cancelled	0.3%	0.0%	1.7%	0.6%
Average departure delay (late minutes only)	10.0 min	9.3 min	13.2 min	10.6 min
Scheduled departures a day	12	12	16	19,421
Scheduled departures	345	344	5,714	582,622

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	226	66%	76.1%	8.3 min	0.0%
AS Alaska Airlines	59	17%	67.8%	7.8 min	1.7%
AA American Airlines	30	9%	90.0%	-2.9 min	0.0%
MQ Envoy Air	30	9%	96.7%	-4.1 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
STS–SAN	Santa Rosa to San Diego	60	68.3%	13.3 min	0.0%
STS–SNA	Santa Rosa to Santa Ana	60	75.0%	7.7 min	0.0%
STS–SEA	Santa Rosa to Seattle	59	67.8%	7.8 min	1.7%
STS–LAX	Santa Rosa to Los Angeles	56	89.3%	-0.9 min	0.0%
STS–DFW	Santa Rosa to Dallas/Fort Worth	30	90.0%	-2.9 min	0.0%
STS–PHX	Santa Rosa to Phoenix	30	96.7%	-4.1 min	0.0%
STS–PDX	Santa Rosa to Portland	29	75.9%	12.1 min	0.0%
STS–BUR	Santa Rosa to Burbank	21	66.7%	15.2 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), September 2024.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2024	Minutes
Air carrier	17.4%	38.6%	685
Late-arriving aircraft	36.8%	38.4%	1,445
National Aviation System	28.7%	18.2%	1,127
Extreme weather	17.1%	4.8%	671
Security	0.0%	0.1%	0

3,928 delay minutes on 76 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 2024?

83.2% of 345 scheduled domestic departures left less than 15 minutes late, and 77.7% reached their destination on time. The national figures that month were 84.4% and 83.9%.

How does that compare with a year earlier?

In September 2023, 83.4% of 344 departures left on time and 0.0% were cancelled, against 83.2% and 0.3% in September 2024.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 2024; 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.