William P Hobby in May 2026

64.3%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 May 2026, reporting carriers scheduled 4,533 domestic departures from William P Hobby (HOU). 64.3% left less than 15 minutes late and 71.1% reached their destination on time; 0.8% were cancelled.

Nationally that month, 77.1% of flights departed on time and 77.6% arrived on time, so HOU departures were 12.8 points below the national departure figure.

A year earlier, in May 2025, the airport had 4,742 departures with 73.5% leaving on time: a change of −9.2 points, with flights down 4%.

Flights arriving at HOU that month were on time 69.7% of the time (4,533 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 46%, air carrier 34% and national aviation system 15%.

On time 71.1%
Arrived 15+ minutes late 27.8%
Cancelled 0.8%
Diverted 0.3%

Every scheduled departure from HOU in May 2026, judged by arrival at the destination.

May 2026 against a year earlier, the airport's year and the nation

Measure	May 2026	May 2025	HOU, 12 months to Jul 2026	All reported flights, May 2026
Departed on time	64.3%	73.5%	72.7%	77.1%
Arrived on time	71.1%	75.8%	76.0%	77.6%
Cancelled	0.8%	0.9%	0.9%	0.9%
Average departure delay (late minutes only)	18.7 min	16.3 min	15.0 min	16.0 min
Scheduled departures a day	151	158	148	20,391
Scheduled departures	4,533	4,742	53,894	611,735

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	4,246	94%	70.7%	9.5 min	0.5%
DL Delta Air Lines	118	3%	78.8%	-0.5 min	4.2%
MQ Envoy Air	83	2%	78.3%	0.1 min	6.0%
OO SkyWest Airlines	37	1%	75.7%	65.9 min	8.1%
OH PSA Airlines	32	1%	71.9%	13.4 min	6.3%
G4 Allegiant Air	17	0%	64.7%	7.9 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
HOU–DAL	Houston to Dallas	350	77.4%	4.3 min	1.7%
HOU–ATL	Houston to Atlanta	242	70.7%	6.3 min	2.1%
HOU–PHX	Houston to Phoenix	197	73.6%	8.4 min	0.5%
HOU–MSY	Houston to New Orleans	194	76.8%	8.5 min	0.0%
HOU–MCO	Houston to Orlando	183	76.5%	8.6 min	0.0%
HOU–DEN	Houston to Denver	180	77.2%	1.9 min	0.6%
HOU–LAS	Houston to Las Vegas	161	67.1%	9.5 min	0.0%
HOU–BNA	Houston to Nashville	152	71.1%	9.0 min	0.7%
HOU–DFW	Houston to Dallas/Fort Worth	152	76.3%	18.7 min	6.6%
HOU–MDW	Houston to Chicago	149	70.5%	12.7 min	0.0%
HOU–STL	Houston to St. Louis	132	70.5%	6.3 min	1.5%
HOU–BWI	Houston to Baltimore	124	77.4%	3.3 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 2026.

Delay causes

BTS cause category	Share of delay minutes	National, May 2026	Minutes
Air carrier	34.4%	33.0%	21,802
Late-arriving aircraft	46.0%	40.4%	29,128
National Aviation System	14.6%	20.5%	9,218
Extreme weather	4.8%	6.0%	3,024
Security	0.2%	0.1%	133

63,305 delay minutes on 1,259 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 2026?

64.3% of 4,533 scheduled domestic departures left less than 15 minutes late, and 71.1% reached their destination on time. The national figures that month were 77.1% and 77.6%.

How does that compare with a year earlier?

In May 2025, 73.5% of 4,742 departures left on time and 0.9% were cancelled, against 64.3% and 0.8% in May 2026.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for May 2026; 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.