William P Hobby in May 2025

73.5%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 May 2025, reporting carriers scheduled 4,742 domestic departures from William P Hobby (HOU). 73.5% left less than 15 minutes late and 75.8% reached their destination on time; 0.9% were cancelled.

Nationally that month, 76.7% of flights departed on time and 75.4% arrived on time, so HOU departures were 3.2 points below the national departure figure.

A year earlier, in May 2024, the airport had 5,010 departures with 60.9% leaving on time: a change of +12.6 points, with flights down 5%.

Flights arriving at HOU that month were on time 77.5% of the time (4,742 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 36%, air carrier 30% and national aviation system 28%.

On time 75.8%
Arrived 15+ minutes late 23.2%
Cancelled 0.9%
Diverted 0.2%

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

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

Measure	May 2025	May 2024	HOU, 12 months to Jul 2026	All reported flights, May 2025
Departed on time	73.5%	60.9%	72.7%	76.7%
Arrived on time	75.8%	64.6%	76.0%	75.4%
Cancelled	0.9%	2.5%	0.9%	1.0%
Average departure delay (late minutes only)	16.3 min	29.7 min	15.0 min	17.5 min
Scheduled departures a day	158	167	148	20,188
Scheduled departures	4,742	5,010	53,894	605,648

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	4,415	93%	76.2%	8.7 min	0.6%
DL Delta Air Lines	141	3%	75.2%	21.6 min	0.7%
OO SkyWest Airlines	62	1%	75.8%	14.0 min	4.8%
OH PSA Airlines	53	1%	54.7%	44.7 min	15.1%
MQ Envoy Air	44	1%	61.4%	21.3 min	6.8%
G4 Allegiant Air	27	1%	77.8%	-0.5 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
HOU–DAL	Houston to Dallas	359	76.3%	12.5 min	3.6%
HOU–ATL	Houston to Atlanta	261	75.5%	15.1 min	0.8%
HOU–MSY	Houston to New Orleans	205	80.5%	4.8 min	0.5%
HOU–PHX	Houston to Phoenix	196	74.5%	7.7 min	0.0%
HOU–LAS	Houston to Las Vegas	184	75.0%	9.9 min	0.5%
HOU–DEN	Houston to Denver	172	68.0%	14.7 min	0.6%
HOU–MDW	Houston to Chicago	161	78.9%	7.7 min	0.6%
HOU–DFW	Houston to Dallas/Fort Worth	159	64.8%	25.6 min	8.8%
HOU–MCO	Houston to Orlando	155	74.2%	11.6 min	0.0%
HOU–BNA	Houston to Nashville	149	75.2%	7.3 min	0.7%
HOU–AUS	Houston to Austin	132	72.0%	13.1 min	0.0%
HOU–SAT	Houston to San Antonio	132	78.0%	1.5 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), May 2025.

Delay causes

BTS cause category	Share of delay minutes	National, May 2025	Minutes
Air carrier	30.0%	29.3%	21,420
Late-arriving aircraft	36.3%	37.8%	25,953
National Aviation System	27.9%	25.9%	19,931
Extreme weather	5.8%	6.9%	4,111
Security	0.0%	0.1%	9

71,424 delay minutes on 1,098 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 May 2025?

73.5% of 4,742 scheduled domestic departures left less than 15 minutes late, and 75.8% reached their destination on time. The national figures that month were 76.7% and 75.4%.

How does that compare with a year earlier?

In May 2024, 60.9% of 5,010 departures left on time and 2.5% were cancelled, against 73.5% and 0.9% in May 2025.

Provenance

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