Charles M. Schulz - Sonoma County in October 2025

83.7%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 October 2025, reporting carriers scheduled 404 domestic departures from Charles M. Schulz - Sonoma County (STS). 83.7% left less than 15 minutes late and 80.9% reached their destination on time; 1.0% were cancelled.

Nationally that month, 80.0% of flights departed on time and 79.1% arrived on time, so STS departures were 3.7 points above the national departure figure.

A year earlier, in October 2024, the airport had 348 departures with 80.5% leaving on time: a change of +3.2 points, with flights up 16%.

Flights arriving at STS that month were on time 80.4% of the time (404 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 54%, air carrier 19% and national aviation system 17%.

On time 80.9%
Arrived 15+ minutes late 17.8%
Cancelled 1.0%
Diverted 0.2%

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

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

Measure	Oct 2025	Oct 2024	STS, 12 months to Jul 2026	All reported flights, Oct 2025
Departed on time	83.7%	80.5%	80.4%	80.0%
Arrived on time	80.9%	77.0%	78.8%	79.1%
Cancelled	1.0%	0.6%	1.7%	0.5%
Average departure delay (late minutes only)	12.2 min	15.7 min	13.2 min	13.9 min
Scheduled departures a day	14	12	16	20,195
Scheduled departures	404	348	5,714	605,844

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	289	72%	80.3%	4.3 min	1.4%
MQ Envoy Air	81	20%	79.0%	14.1 min	0.0%
AS Alaska Airlines	34	8%	91.2%	-3.6 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
STS–SAN	Santa Rosa to San Diego	86	76.7%	6.5 min	4.7%
STS–SNA	Santa Rosa to Santa Ana	62	80.6%	9.4 min	0.0%
STS–PHX	Santa Rosa to Phoenix	61	68.9%	24.7 min	0.0%
STS–LAX	Santa Rosa to Los Angeles	51	86.3%	-0.3 min	0.0%
STS–BUR	Santa Rosa to Burbank	36	72.2%	-1.7 min	0.0%
STS–PDX	Santa Rosa to Portland	36	97.2%	-6.5 min	0.0%
STS–SEA	Santa Rosa to Seattle	34	91.2%	-3.6 min	0.0%
STS–DFW	Santa Rosa to Dallas/Fort Worth	25	96.0%	-8.1 min	0.0%
STS–LAS	Santa Rosa to Las Vegas	9	77.8%	6.9 min	0.0%
STS–PSP	Santa Rosa to Palm Springs	4	50.0%	42.8 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), October 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Oct 2025	Minutes
Air carrier	18.5%	34.0%	927
Late-arriving aircraft	54.0%	39.7%	2,705
National Aviation System	16.5%	22.9%	826
Extreme weather	11.0%	3.3%	551
Security	0.0%	0.1%	0

5,009 delay minutes on 72 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 October 2025?

83.7% of 404 scheduled domestic departures left less than 15 minutes late, and 80.9% reached their destination on time. The national figures that month were 80.0% and 79.1%.

How does that compare with a year earlier?

In October 2024, 80.5% of 348 departures left on time and 0.6% were cancelled, against 83.7% and 1.0% in October 2025.

Provenance

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