Charles M. Schulz - Sonoma County in January 2025

81.7%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 January 2025, reporting carriers scheduled 279 domestic departures from Charles M. Schulz - Sonoma County (STS). 81.7% left less than 15 minutes late and 76.0% reached their destination on time; 2.2% were cancelled.

Nationally that month, 79.3% of flights departed on time and 78.6% arrived on time, so STS departures were 2.4 points above the national departure figure.

A year earlier, in January 2024, the airport had 250 departures with 78.4% leaving on time: a change of +3.3 points, with flights up 12%.

Flights arriving at STS that month were on time 76.3% of the time (279 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 53%, national aviation system 26% and air carrier 11%.

On time 76.0%
Arrived 15+ minutes late 21.5%
Cancelled 2.2%
Diverted 0.4%

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

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

Measure	Jan 2025	Jan 2024	STS, 12 months to Jul 2026	All reported flights, Jan 2025
Departed on time	81.7%	78.4%	80.4%	79.3%
Arrived on time	76.0%	80.0%	78.8%	78.6%
Cancelled	2.2%	1.6%	1.7%	3.0%
Average departure delay (late minutes only)	13.4 min	14.4 min	13.2 min	14.0 min
Scheduled departures a day	9	8	16	17,992
Scheduled departures	279	250	5,714	539,747

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	248	89%	74.2%	11.2 min	2.4%
MQ Envoy Air	31	11%	90.3%	-1.3 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
STS–LAX	Santa Rosa to Los Angeles	55	70.9%	10.4 min	1.8%
STS–SAN	Santa Rosa to San Diego	53	67.9%	5.9 min	7.5%
STS–SNA	Santa Rosa to Santa Ana	51	76.5%	18.1 min	0.0%
STS–PHX	Santa Rosa to Phoenix	33	90.9%	-1.0 min	0.0%
STS–BUR	Santa Rosa to Burbank	31	93.5%	-4.5 min	3.2%
STS–LAS	Santa Rosa to Las Vegas	31	74.2%	15.6 min	0.0%
STS–SEA	Santa Rosa to Seattle	20	60.0%	21.0 min	0.0%
STS–PDX	Santa Rosa to Portland	5	80.0%	31.8 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), January 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Jan 2025	Minutes
Air carrier	11.0%	36.2%	423
Late-arriving aircraft	52.7%	34.7%	2,035
National Aviation System	25.8%	19.9%	994
Extreme weather	10.6%	9.1%	408
Security	0.0%	0.2%	0

3,860 delay minutes on 60 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 January 2025?

81.7% of 279 scheduled domestic departures left less than 15 minutes late, and 76.0% reached their destination on time. The national figures that month were 79.3% and 78.6%.

How does that compare with a year earlier?

In January 2024, 78.4% of 250 departures left on time and 1.6% were cancelled, against 81.7% and 2.2% in January 2025.

Provenance

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