San Luis Obispo County Regional in September 2025

80.4%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 September 2025, reporting carriers scheduled 358 domestic departures from San Luis Obispo County Regional (SBP). 80.4% left less than 15 minutes late and 75.7% reached their destination on time; 1.1% were cancelled.

Nationally that month, 83.1% of flights departed on time and 82.8% arrived on time, so SBP departures were 2.7 points below the national departure figure.

A year earlier, in September 2024, the airport had 483 departures with 85.7% leaving on time: a change of −5.3 points, with flights down 26%.

Flights arriving at SBP that month were on time 82.1% of the time (358 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 52%, late-arriving aircraft 20% and national aviation system 16%.

On time 75.7%
Arrived 15+ minutes late 22.9%
Cancelled 1.1%
Diverted 0.3%

Every scheduled departure from SBP in September 2025, judged by arrival at the destination.

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

Measure	Sep 2025	Sep 2024	SBP, 12 months to Jul 2026	All reported flights, Sep 2025
Departed on time	80.4%	85.7%	78.8%	83.1%
Arrived on time	75.7%	84.5%	75.3%	82.8%
Cancelled	1.1%	0.6%	1.2%	0.5%
Average departure delay (late minutes only)	29.8 min	17.8 min	20.9 min	12.2 min
Scheduled departures a day	12	16	14	18,748
Scheduled departures	358	483	5,010	562,439

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	218	61%	72.5%	13.9 min	0.5%
AA American Airlines	84	23%	76.2%	56.1 min	1.2%
AS Alaska Airlines	28	8%	89.3%	-6.1 min	3.6%
UA United Airlines	28	8%	85.7%	9.9 min	3.6%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SBP–SFO	San Luis Obispo to San Francisco	85	63.5%	7.2 min	0.0%
SBP–PHX	San Luis Obispo to Phoenix	83	72.3%	63.7 min	2.4%
SBP–DEN	San Luis Obispo to Denver	55	83.6%	5.3 min	1.8%
SBP–LAX	San Luis Obispo to Los Angeles	52	84.6%	0.3 min	0.0%
SBP–SAN	San Luis Obispo to San Diego	28	78.6%	16.4 min	0.0%
SBP–SEA	San Luis Obispo to Seattle	28	89.3%	-6.1 min	3.6%
SBP–DFW	San Luis Obispo to Dallas/Fort Worth	27	74.1%	51.9 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), September 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2025	Minutes
Air carrier	51.9%	34.3%	5,487
Late-arriving aircraft	19.6%	37.4%	2,072
National Aviation System	15.9%	22.6%	1,686
Extreme weather	11.7%	5.6%	1,242
Security	0.9%	0.1%	90

10,577 delay minutes on 82 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 SBP on time in September 2025?

80.4% of 358 scheduled domestic departures left less than 15 minutes late, and 75.7% reached their destination on time. The national figures that month were 83.1% and 82.8%.

How does that compare with a year earlier?

In September 2024, 85.7% of 483 departures left on time and 0.6% were cancelled, against 80.4% and 1.1% in September 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 2025; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for SBP · methodology · corrections.