William P Hobby in August 2025

76.3%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 August 2025, reporting carriers scheduled 4,640 domestic departures from William P Hobby (HOU). 76.3% left less than 15 minutes late and 77.7% reached their destination on time; 0.4% were cancelled.

Nationally that month, 76.8% of flights departed on time and 76.3% arrived on time, so HOU departures were 0.5 points below the national departure figure.

A year earlier, in August 2024, the airport had 4,702 departures with 80.4% leaving on time: a change of −4.1 points, with flights down 1%.

Flights arriving at HOU that month were on time 78.8% of the time (4,642 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 45%, air carrier 26% and national aviation system 20%.

On time 77.7%
Arrived 15+ minutes late 21.7%
Cancelled 0.4%
Diverted 0.3%

Every scheduled departure from HOU in August 2025, judged by arrival at the destination.

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

Measure	Aug 2025	Aug 2024	HOU, 12 months to Jul 2026	All reported flights, Aug 2025
Departed on time	76.3%	80.4%	72.7%	76.8%
Arrived on time	77.7%	84.6%	76.0%	76.3%
Cancelled	0.4%	0.7%	0.9%	1.1%
Average departure delay (late minutes only)	14.2 min	11.6 min	15.0 min	17.6 min
Scheduled departures a day	155	157	148	20,079
Scheduled departures	4,640	4,702	53,894	602,378

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	4,291	92%	78.0%	6.5 min	0.3%
MQ Envoy Air	162	3%	69.8%	17.9 min	1.2%
DL Delta Air Lines	130	3%	83.8%	7.8 min	0.0%
OO SkyWest Airlines	31	1%	51.6%	15.4 min	9.7%
G4 Allegiant Air	26	1%	73.1%	17.8 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
HOU–DAL	Houston to Dallas	345	75.9%	8.5 min	1.4%
HOU–ATL	Houston to Atlanta	262	80.2%	7.6 min	0.0%
HOU–DFW	Houston to Dallas/Fort Worth	193	66.8%	17.5 min	2.6%
HOU–DEN	Houston to Denver	192	70.8%	12.2 min	0.0%
HOU–MSY	Houston to New Orleans	177	85.9%	2.9 min	0.0%
HOU–MDW	Houston to Chicago	167	76.0%	8.7 min	1.8%
HOU–LAS	Houston to Las Vegas	162	87.0%	-0.9 min	0.0%
HOU–PHX	Houston to Phoenix	159	81.1%	2.4 min	0.6%
HOU–BNA	Houston to Nashville	145	73.1%	7.6 min	0.0%
HOU–MCO	Houston to Orlando	145	71.7%	14.9 min	0.0%
HOU–SAT	Houston to San Antonio	143	84.6%	0.1 min	0.0%
HOU–AUS	Houston to Austin	139	79.9%	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), August 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Aug 2025	Minutes
Air carrier	26.2%	33.1%	14,656
Late-arriving aircraft	44.7%	40.5%	25,024
National Aviation System	19.9%	19.2%	11,119
Extreme weather	9.2%	7.0%	5,161
Security	0.1%	0.1%	40

56,000 delay minutes on 1,007 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 August 2025?

76.3% of 4,640 scheduled domestic departures left less than 15 minutes late, and 77.7% reached their destination on time. The national figures that month were 76.8% and 76.3%.

How does that compare with a year earlier?

In August 2024, 80.4% of 4,702 departures left on time and 0.7% were cancelled, against 76.3% and 0.4% in August 2025.

Provenance

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