Charles M. Schulz - Sonoma County in December 2023

77.5%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 December 2023, reporting carriers scheduled 276 domestic departures from Charles M. Schulz - Sonoma County (STS). 77.5% left less than 15 minutes late and 79.0% reached their destination on time; 2.5% were cancelled.

Nationally that month, 83.1% of flights departed on time and 83.8% arrived on time, so STS departures were 5.6 points below the national departure figure.

Flights arriving at STS that month were on time 75.0% of the time (276 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, extreme weather 53%, air carrier 25% and late-arriving aircraft 13%.

On time 79.0%
Arrived 15+ minutes late 18.5%
Cancelled 2.5%
Diverted 0.0%

Every scheduled departure from STS in December 2023, judged by arrival at the destination.

December 2023 against a year earlier, the airport's year and the nation

Measure	Dec 2023	Year earlier	STS, 12 months to Jul 2026	All reported flights, Dec 2023
Departed on time	77.5%	—	80.4%	83.1%
Arrived on time	79.0%	—	78.8%	83.8%
Cancelled	2.5%	—	1.7%	0.4%
Average departure delay (late minutes only)	25.0 min	—	13.2 min	11.6 min
Scheduled departures a day	9	—	16	19,013
Scheduled departures	276	—	5,714	570,394

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	237	86%	79.3%	20.7 min	2.5%
AS Alaska Airlines	31	11%	74.2%	6.1 min	3.2%
MQ Envoy Air	8	3%	87.5%	-4.7 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
STS–PHX	Santa Rosa to Phoenix	60	75.0%	69.8 min	1.7%
STS–LAX	Santa Rosa to Los Angeles	58	87.9%	-1.6 min	1.7%
STS–SAN	Santa Rosa to San Diego	56	73.2%	11.0 min	3.6%
STS–SEA	Santa Rosa to Seattle	31	74.2%	6.1 min	3.2%
STS–SNA	Santa Rosa to Santa Ana	31	80.6%	2.5 min	0.0%
STS–BUR	Santa Rosa to Burbank	18	72.2%	10.3 min	5.6%
STS–PDX	Santa Rosa to Portland	18	88.9%	-6.5 min	5.6%
STS–DFW	Santa Rosa to Dallas/Fort Worth	4	100.0%	-5.2 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 2023.

Delay causes

BTS cause category	Share of delay minutes	National, Dec 2023	Minutes
Air carrier	25.0%	37.1%	1,600
Late-arriving aircraft	12.9%	38.8%	826
National Aviation System	9.4%	17.6%	602
Extreme weather	52.6%	6.2%	3,362
Security	0.0%	0.3%	0

6,390 delay minutes on 51 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 2023?

77.5% of 276 scheduled domestic departures left less than 15 minutes late, and 79.0% reached their destination on time. The national figures that month were 83.1% and 83.8%.

How does that compare with a year earlier?

December 2022 is outside the 36 months on file, or the airport had too few reported flights that month.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for December 2023; 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.