William P Hobby in September 2025

85.1%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 4,452 domestic departures from William P Hobby (HOU). 85.1% left less than 15 minutes late and 85.8% reached their destination on time; 0.1% were cancelled.

Nationally that month, 83.1% of flights departed on time and 82.8% arrived on time, so HOU departures were 2.0 points above the national departure figure.

A year earlier, in September 2024, the airport had 4,407 departures with 85.4% leaving on time: a change of −0.3 points, with flights up 1%.

Flights arriving at HOU that month were on time 86.4% of the time (4,451 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 44%, air carrier 27% and national aviation system 22%.

On time 85.8%
Arrived 15+ minutes late 13.9%
Cancelled 0.1%
Diverted 0.1%

Every scheduled departure from HOU 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	HOU, 12 months to Jul 2026	All reported flights, Sep 2025
Departed on time	85.1%	85.4%	72.7%	83.1%
Arrived on time	85.8%	89.0%	76.0%	82.8%
Cancelled	0.1%	0.4%	0.9%	0.5%
Average departure delay (late minutes only)	7.9 min	6.6 min	15.0 min	12.2 min
Scheduled departures a day	148	147	148	18,748
Scheduled departures	4,452	4,407	53,894	562,439

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	4,136	93%	86.0%	0.6 min	0.1%
MQ Envoy Air	157	4%	82.2%	10.0 min	0.0%
DL Delta Air Lines	122	3%	94.3%	-11.3 min	0.0%
OO SkyWest Airlines	29	1%	58.6%	13.4 min	6.9%
G4 Allegiant Air	8	0%	75.0%	1.3 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
HOU–DAL	Houston to Dallas	332	86.4%	-4.0 min	0.0%
HOU–ATL	Houston to Atlanta	250	92.4%	-7.1 min	0.0%
HOU–DEN	Houston to Denver	188	76.6%	4.9 min	0.0%
HOU–DFW	Houston to Dallas/Fort Worth	186	78.5%	10.5 min	1.1%
HOU–MSY	Houston to New Orleans	176	91.5%	-5.6 min	0.0%
HOU–MDW	Houston to Chicago	163	88.3%	2.3 min	0.6%
HOU–LAS	Houston to Las Vegas	155	83.2%	3.4 min	0.0%
HOU–PHX	Houston to Phoenix	150	78.7%	8.1 min	0.7%
HOU–SAT	Houston to San Antonio	141	92.2%	-3.4 min	0.0%
HOU–BNA	Houston to Nashville	138	85.5%	1.7 min	0.0%
HOU–MCO	Houston to Orlando	138	89.9%	-5.3 min	0.0%
HOU–AUS	Houston to Austin	136	85.3%	-0.4 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	27.3%	34.3%	7,577
Late-arriving aircraft	43.8%	37.4%	12,158
National Aviation System	22.4%	22.6%	6,210
Extreme weather	6.2%	5.6%	1,707
Security	0.3%	0.1%	83

27,735 delay minutes on 619 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 HOU on time in September 2025?

85.1% of 4,452 scheduled domestic departures left less than 15 minutes late, and 85.8% 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, 85.4% of 4,407 departures left on time and 0.4% were cancelled, against 85.1% and 0.1% 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 HOU · methodology · corrections.