San Antonio International in September 2025

85.8%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 3,334 domestic departures from San Antonio International (SAT). 85.8% left less than 15 minutes late and 84.9% reached their destination on time; 0.6% were cancelled.

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

A year earlier, in September 2024, the airport had 3,444 departures with 86.4% leaving on time: a change of −0.6 points, with flights down 3%.

Flights arriving at SAT that month were on time 83.1% of the time (3,335 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 38%, air carrier 30% and national aviation system 25%.

On time 84.9%
Arrived 15+ minutes late 14.2%
Cancelled 0.6%
Diverted 0.3%

Every scheduled departure from SAT 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	SAT, 12 months to Jul 2026	All reported flights, Sep 2025
Departed on time	85.8%	86.4%	80.3%	83.1%
Arrived on time	84.9%	86.6%	80.6%	82.8%
Cancelled	0.6%	0.1%	1.2%	0.5%
Average departure delay (late minutes only)	11.0 min	11.0 min	14.7 min	12.2 min
Scheduled departures a day	111	115	110	18,748
Scheduled departures	3,334	3,444	40,226	562,439

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	1,257	38%	86.0%	0.0 min	0.2%
AA American Airlines	602	18%	83.2%	6.9 min	1.8%
DL Delta Air Lines	568	17%	85.7%	-2.1 min	0.2%
UA United Airlines	504	15%	84.7%	-0.4 min	0.2%
NK Spirit Airlines	108	3%	75.0%	15.7 min	1.9%
OO SkyWest Airlines	92	3%	88.0%	1.4 min	0.0%
F9 Frontier Airlines	68	2%	85.3%	5.3 min	0.0%
MQ Envoy Air	60	2%	76.7%	10.9 min	3.3%
AS Alaska Airlines	47	1%	93.6%	-8.0 min	0.0%
YX Republic Airline	28	1%	82.1%	-5.5 min	3.6%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SAT–DFW	San Antonio to Dallas/Fort Worth	367	80.4%	11.7 min	3.3%
SAT–ATL	San Antonio to Atlanta	260	94.6%	-10.8 min	0.0%
SAT–IAH	San Antonio to Houston	229	83.0%	-0.8 min	0.0%
SAT–DAL	San Antonio to Dallas	219	87.2%	-4.4 min	0.9%
SAT–DEN	San Antonio to Denver	219	82.2%	3.1 min	0.5%
SAT–LAS	San Antonio to Las Vegas	189	78.3%	9.2 min	0.5%
SAT–PHX	San Antonio to Phoenix	171	83.0%	10.4 min	1.2%
SAT–LAX	San Antonio to Los Angeles	155	89.0%	-0.7 min	0.0%
SAT–ORD	San Antonio to Chicago	151	80.8%	2.7 min	0.7%
SAT–HOU	San Antonio to Houston	141	83.0%	1.8 min	0.0%
SAT–CLT	San Antonio to Charlotte	120	90.0%	-9.3 min	0.0%
SAT–DTW	San Antonio to Detroit	82	92.7%	-9.0 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), September 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2025	Minutes
Air carrier	29.6%	34.3%	9,923
Late-arriving aircraft	37.8%	37.4%	12,681
National Aviation System	25.0%	22.6%	8,388
Extreme weather	7.5%	5.6%	2,504
Security	0.0%	0.1%	14

33,510 delay minutes on 475 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 SAT on time in September 2025?

85.8% of 3,334 scheduled domestic departures left less than 15 minutes late, and 84.9% 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, 86.4% of 3,444 departures left on time and 0.1% were cancelled, against 85.8% and 0.6% 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 SAT · methodology · corrections.