Airport month record

HOUJUL

William P. Hobby in July 2025

Departures: 5,093
Month: July 2025
National, same month: 71.1%
Carriers: 5

Historical statistics for July 2025, not live status or a forecast for this year’s July. For today’s conditions at HOU, see live FAA status.

HOU in July sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, level with the national rate of 71.1%. The late ones land about an hour behind schedule. That rests on 5,093 flights, with a median arrival 1 minute early.

On time

70.7%

Arrivals under 15 minutes late, of 5,031 completed departures

Avg delay

59 min

Across delayed arrivals only, not all flights

Cancelled

0.79%

Nationally in July: 2.45%

Whole year

76.9%

HOU across all twelve months

These figures cover 5,093 departures from William P. Hobby in July 2025. On time means an arrival less than 15 minutes after the scheduled gate time, the DOT's threshold, and the national comparison uses every US departure in the same month rather than the whole year.

Against the year

July next to HOU's other months

Against HOU's own year, July ran 6 points worse than the twelve-month rate of 76.9%, which makes it number ten of twelve months, best first.

HOU month by month
Month	Flights	On time	Avg delay	Cancelled	Grade
July 2025 (this page)	5,093	70.7%	59 min	0.79%	C+
August 2025	4,640	78.2%	56 min	0.37%	B+
September 2025	4,452	86.1%	45 min	0.11%	A+
October 2025	4,887	78.0%	50 min	0.23%	B+
November 2025	4,552	80.1%	58 min	2.20%	B
December 2025	4,634	82.0%	49 min	0.43%	B+
January 2026	4,081	88.0%	44 min	2.55%	A
February 2026	3,832	84.2%	48 min	0.68%	B+
March 2026	4,578	67.5%	54 min	1.42%	C
April 2026	4,418	75.8%	50 min	0.14%	B+
May 2026	4,533	71.9%	51 min	0.79%	C+
June 2026	4,514	63.6%	56 min	0.62%	D+

Departure window

The best time of day to leave HOU in July

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 42 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am638 flights95.0%
8am–11am1,132 flights89.1%
11am–2pm655 flights71.5%
2pm–5pm841 flights59.2%
5pm–8pm754 flights59.0%
8pm–5am1,073 flights53.3%

Scale runs 45% to 100%. Rows with fewer than 30 flights show a dash.

The 8pm–5am window is where this operation falls apart: 53.3% on time, against 95.0% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 8am–11am window is the busiest, with 1,132 flights scheduled in it.

Across the week, Saturday is the strongest day at 75.8% on time and Sunday the weakest at 63.7%. 12 points is a smaller lever than departure hour, but it is free.

Carrier by carrier

Which airlines ran best at HOU in July

Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.

Carriers at HOU in July 2025
Airline	Flights	On time	Avg delay	Cancelled	Grade
Southwest Airlines	4,695	70.3%	58 min	0.60%	C+
Envoy Airthin sample	154	80.4%	58 min	3.90%	B−
Delta Air Linesthin sample	139	78.1%	94 min	0.72%	B+
SkyWest Airlinesthin sample	56	59.6%	95 min	7.14%	D−
Allegiant Airthin sample	49	72.9%	60 min	2.04%	C

Route by route

Busiest routes out of HOU in July

Routes from HOU in July 2025
Route	Flights	On time	Avg delay	Cancelled	Grade
HOU to DAL · Dallasthin sample	344	73.1%	57 min	1.45%	C
HOU to ATL · Atlantathin sample	275	73.6%	66 min	0.36%	C+
HOU to DFW · Dallas-Fort Worththin sample	210	75.0%	74 min	4.76%	B−
HOU to DEN · Denverthin sample	203	70.6%	66 min	0.99%	C+
HOU to LAS · Las Vegasthin sample	189	82.0%	55 min	0.00%	B+
HOU to MDW · Chicagothin sample	187	63.7%	59 min	1.60%	D
HOU to MCO · Orlandothin sample	181	66.1%	55 min	0.00%	C+
HOU to MSY · New Orleansthin sample	180	77.8%	54 min	0.00%	B+
HOU to PHX · Phoenixthin sample	180	75.6%	59 min	0.00%	B+
HOU to BNA · Nashvillethin sample	149	68.7%	57 min	0.67%	C+
HOU to STL · St. Louisthin sample	144	78.3%	75 min	0.00%	B+
HOU to AUS · Austinthin sample	131	61.8%	60 min	0.00%	D+
HOU to SAT · San Antoniothin sample	131	74.0%	50 min	0.00%	C+
HOU to BWI · Baltimorethin sample	128	70.8%	69 min	5.47%	C−
HOU to LGA · New Yorkthin sample	116	76.4%	64 min	2.59%	B
HOU to HRL · Harlingenthin sample	115	64.3%	57 min	0.00%	D+
HOU to MAF · Midlandthin sample	115	72.2%	54 min	0.00%	C+
HOU to LAX · Los Angelesthin sample	115	73.9%	63 min	0.00%	C+
HOU to OKC · Oklahoma Citythin sample	114	65.8%	62 min	0.00%	C+
HOU to TPA · Tampathin sample	93	74.2%	31 min	0.00%	C+
HOU to DCA · Washingtonthin sample	93	73.3%	58 min	2.15%	C
HOU to ELP · El Pasothin sample	93	72.2%	73 min	1.08%	C
HOU to MCI · Kansas Citythin sample	92	68.9%	63 min	2.17%	C
HOU to ABQ · Albuquerquethin sample	92	77.2%	84 min	0.00%	B+
HOU to CRP · Corpus Christithin sample	89	73.0%	78 min	0.00%	C+

Delay causes

What held HOU up in July

One category carries most of the weight here. Late-arriving aircraft accounts for 50% of the 87,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
50%
Carrier
29%
National Airspace System
14%
Extreme weather
7%
Security
0%

50% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 87,000 reported delay minutes here, that single category outweighs weather by 8 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 87,252 reported delay minutes.

Cancellations are rare at 0.79%, below the national 2.45% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 9.4% of arrivals land a full hour or more behind schedule, against 12.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

What to do with this

Flying from HOU in July

For a July trip through HOU: plan on this being one of the airport's harder months. The 5am–8am departures held up best at 95.0% on time, and with 9.4% of arrivals an hour or more late, a connection here deserves more slack than the same trip in January would.

Where to go next

Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures