Charles M. Schulz - Sonoma County in March 2026

87.4%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 March 2026, reporting carriers scheduled 443 domestic departures from Charles M. Schulz - Sonoma County (STS). 87.4% left less than 15 minutes late and 85.6% reached their destination on time; 0.2% were cancelled.

Nationally that month, 72.8% of flights departed on time and 73.2% arrived on time, so STS departures were 14.6 points above the national departure figure.

A year earlier, in March 2025, the airport had 319 departures with 81.5% leaving on time: a change of +5.9 points, with flights up 39%.

Flights arriving at STS that month were on time 89.2% of the time (443 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 45%, national aviation system 27% and air carrier 26%.

On time 85.6%
Arrived 15+ minutes late 14.2%
Cancelled 0.2%
Diverted 0.0%

Every scheduled departure from STS in March 2026, judged by arrival at the destination.

March 2026 against a year earlier, the airport's year and the nation

Measure	Mar 2026	Mar 2025	STS, 12 months to Jul 2026	All reported flights, Mar 2026
Departed on time	87.4%	81.5%	80.4%	72.8%
Arrived on time	85.6%	75.5%	78.8%	73.2%
Cancelled	0.2%	0.3%	1.7%	2.9%
Average departure delay (late minutes only)	9.5 min	13.4 min	13.2 min	20.3 min
Scheduled departures a day	15	11	16	20,403
Scheduled departures	443	319	5,714	612,102

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	367	83%	85.8%	2.0 min	0.3%
MQ Envoy Air	62	14%	83.9%	-0.2 min	0.0%
AS Alaska Airlines	14	3%	85.7%	-3.1 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
STS–SAN	Santa Rosa to San Diego	69	76.8%	6.2 min	0.0%
STS–LAX	Santa Rosa to Los Angeles	63	85.7%	-0.1 min	0.0%
STS–PHX	Santa Rosa to Phoenix	62	83.9%	-0.2 min	0.0%
STS–SNA	Santa Rosa to Santa Ana	55	83.6%	9.6 min	0.0%
STS–BUR	Santa Rosa to Burbank	51	88.2%	-0.6 min	0.0%
STS–PDX	Santa Rosa to Portland	45	97.8%	-14.0 min	0.0%
STS–LAS	Santa Rosa to Las Vegas	31	93.5%	-0.4 min	0.0%
STS–SEA	Santa Rosa to Seattle	31	77.4%	3.6 min	3.2%
STS–PSP	Santa Rosa to Palm Springs	22	90.9%	1.6 min	0.0%
STS–ONT	Santa Rosa to Ontario	14	85.7%	18.3 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), March 2026.

Delay causes

BTS cause category	Share of delay minutes	National, Mar 2026	Minutes
Air carrier	26.4%	33.5%	1,159
Late-arriving aircraft	45.3%	39.3%	1,987
National Aviation System	27.3%	21.0%	1,197
Extreme weather	0.9%	5.9%	39
Security	0.0%	0.2%	0

4,382 delay minutes on 63 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 2026?

87.4% of 443 scheduled domestic departures left less than 15 minutes late, and 85.6% reached their destination on time. The national figures that month were 72.8% and 73.2%.

How does that compare with a year earlier?

In March 2025, 81.5% of 319 departures left on time and 0.3% were cancelled, against 87.4% and 0.2% in March 2026.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for March 2026; 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.