Charles M. Schulz - Sonoma County in March 2025

81.5%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 March 2025, reporting carriers scheduled 319 domestic departures from Charles M. Schulz - Sonoma County (STS). 81.5% left less than 15 minutes late and 75.5% reached their destination on time; 0.3% were cancelled.

Nationally that month, 79.9% of flights departed on time and 79.3% arrived on time, so STS departures were 1.6 points above the national departure figure.

A year earlier, in March 2024, the airport had 280 departures with 85.7% leaving on time: a change of −4.2 points, with flights up 14%.

Flights arriving at STS that month were on time 76.5% of the time (319 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 33%, air carrier 29% and national aviation system 22%.

On time 75.5%
Arrived 15+ minutes late 23.5%
Cancelled 0.3%
Diverted 0.6%

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

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

Measure	Mar 2025	Mar 2024	STS, 12 months to Jul 2026	All reported flights, Mar 2025
Departed on time	81.5%	85.7%	80.4%	79.9%
Arrived on time	75.5%	77.5%	78.8%	79.3%
Cancelled	0.3%	0.4%	1.7%	1.2%
Average departure delay (late minutes only)	13.4 min	7.3 min	13.2 min	14.9 min
Scheduled departures a day	11	9	16	20,029
Scheduled departures	319	280	5,714	600,872

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	266	83%	75.2%	12.3 min	0.4%
AA American Airlines	31	10%	67.7%	12.5 min	0.0%
MQ Envoy Air	22	7%	90.9%	-0.9 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
STS–LAX	Santa Rosa to Los Angeles	62	79.0%	8.6 min	0.0%
STS–PHX	Santa Rosa to Phoenix	62	75.8%	9.2 min	0.0%
STS–SAN	Santa Rosa to San Diego	54	68.5%	12.9 min	1.9%
STS–SNA	Santa Rosa to Santa Ana	54	79.6%	13.6 min	0.0%
STS–LAS	Santa Rosa to Las Vegas	31	71.0%	22.0 min	0.0%
STS–PDX	Santa Rosa to Portland	30	76.7%	11.1 min	0.0%
STS–BUR	Santa Rosa to Burbank	16	81.3%	2.9 min	0.0%
STS–SEA	Santa Rosa to Seattle	10	70.0%	4.3 min	0.0%

By scheduled departure hour

On-time share:under 62%6270768288% and over

Share of departures that left less than 15 minutes late, by scheduled hour (local time), March 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Mar 2025	Minutes
Air carrier	28.8%	33.0%	1,337
Late-arriving aircraft	32.7%	39.2%	1,518
National Aviation System	21.6%	21.9%	1,003
Extreme weather	16.9%	5.9%	787
Security	0.0%	0.1%	0

4,645 delay minutes on 75 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 March 2025?

81.5% of 319 scheduled domestic departures left less than 15 minutes late, and 75.5% reached their destination on time. The national figures that month were 79.9% and 79.3%.

How does that compare with a year earlier?

In March 2024, 85.7% of 280 departures left on time and 0.4% were cancelled, against 81.5% and 0.3% in March 2025.

Provenance

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