Charles M. Schulz - Sonoma County in December 2024

74.7%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 December 2024, reporting carriers scheduled 387 domestic departures from Charles M. Schulz - Sonoma County (STS). 74.7% left less than 15 minutes late and 70.0% reached their destination on time; 1.0% were cancelled.

Nationally that month, 77.8% of flights departed on time and 78.1% arrived on time, so STS departures were 3.1 points below the national departure figure.

A year earlier, in December 2023, the airport had 276 departures with 77.5% leaving on time: a change of −2.8 points, with flights up 40%.

Flights arriving at STS that month were on time 71.1% of the time (387 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 54%, national aviation system 18% and extreme weather 17%.

On time 70.0%
Arrived 15+ minutes late 28.4%
Cancelled 1.0%
Diverted 0.5%

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

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

Measure	Dec 2024	Dec 2023	STS, 12 months to Jul 2026	All reported flights, Dec 2024
Departed on time	74.7%	77.5%	80.4%	77.8%
Arrived on time	70.0%	79.0%	78.8%	78.1%
Cancelled	1.0%	2.5%	1.7%	0.7%
Average departure delay (late minutes only)	18.2 min	25.0 min	13.2 min	16.6 min
Scheduled departures a day	13	9	16	19,686
Scheduled departures	387	276	5,714	590,581

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	324	84%	67.9%	17.5 min	1.2%
MQ Envoy Air	47	12%	83.0%	-0.4 min	0.0%
AS Alaska Airlines	16	4%	75.0%	10.6 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
STS–LAX	Santa Rosa to Los Angeles	82	65.9%	14.1 min	2.4%
STS–SAN	Santa Rosa to San Diego	68	67.6%	15.6 min	2.9%
STS–PHX	Santa Rosa to Phoenix	57	86.0%	-1.2 min	0.0%
STS–SNA	Santa Rosa to Santa Ana	53	62.3%	24.0 min	0.0%
STS–SEA	Santa Rosa to Seattle	32	81.3%	8.1 min	0.0%
STS–BUR	Santa Rosa to Burbank	31	54.8%	26.8 min	0.0%
STS–LAS	Santa Rosa to Las Vegas	31	71.0%	28.4 min	0.0%
STS–PDX	Santa Rosa to Portland	29	72.4%	13.8 min	0.0%
STS–DFW	Santa Rosa to Dallas/Fort Worth	4	75.0%	4.8 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), December 2024.

Delay causes

BTS cause category	Share of delay minutes	National, Dec 2024	Minutes
Air carrier	11.2%	34.3%	781
Late-arriving aircraft	53.6%	40.2%	3,749
National Aviation System	18.0%	17.8%	1,261
Extreme weather	17.2%	7.5%	1,205
Security	0.0%	0.2%	0

6,996 delay minutes on 110 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 December 2024?

74.7% of 387 scheduled domestic departures left less than 15 minutes late, and 70.0% reached their destination on time. The national figures that month were 77.8% and 78.1%.

How does that compare with a year earlier?

In December 2023, 77.5% of 276 departures left on time and 2.5% were cancelled, against 74.7% and 1.0% in December 2024.

Provenance

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