Airport month record

HOUAUG

William P. Hobby in August 2025

Departures: 4,640
Month: August 2025
National, same month: 77.4%
Carriers: 4

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

HOU in August lands a B+, about a point better than the national rate of 77.4%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 4,640 flights, with a median arrival 4 minutes early.

On time

78.2%

Arrivals under 15 minutes late, of 4,611 completed departures

Avg delay

56 min

Across delayed arrivals only, not all flights

Cancelled

0.37%

Nationally in August: 1.08%

Whole year

76.9%

HOU across all twelve months

These figures cover 4,640 departures from William P. Hobby in August 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

August next to HOU's other months

Against HOU's own year, August ran about a point better than the twelve-month rate of 76.9%, which makes it number six of twelve months, best first. Cancellations were unusually low for HOU in August, at 0.37% against 0.84% across the year. Either side of it, July ran 70.7% on time and September 86.1%, so this month sits in line with its neighbours.

HOU month by month
Month	Flights	On time	Avg delay	Cancelled	Grade
July 2025	5,093	70.7%	59 min	0.79%	C+
August 2025 (this page)	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 August

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 24 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–8am505 flights92.1%
8am–11am1,128 flights88.3%
11am–2pm771 flights74.5%
2pm–5pm702 flights71.8%
5pm–8pm828 flights67.9%
8pm–5am706 flights74.3%

Scale runs 60% to 100%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 92.1% of the time, against 67.9% for the evening window. That is 24 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 1,128 flights scheduled in it.

Across the week, Tuesday is the strongest day at 90.9% on time and Wednesday the weakest at 72.4%. 19 points is a smaller lever than departure hour, but it is free.

Carrier by carrier

Which airlines ran best at HOU in August

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 August 2025
Airline	Flights	On time	Avg delay	Cancelled	Grade
Southwest Airlines	4,291	78.4%	53 min	0.28%	B+
Envoy Airthin sample	162	71.1%	76 min	1.23%	C
Delta Air Linesthin sample	130	83.8%	124 min	0.00%	B+
SkyWest Airlinesthin sample	31	57.1%	41 min	9.68%	D−

Route by route

Busiest routes out of HOU in August

Routes from HOU in August 2025
Route	Flights	On time	Avg delay	Cancelled	Grade
HOU to DAL · Dallasthin sample	345	77.1%	70 min	1.45%	B
HOU to ATL · Atlantathin sample	262	80.2%	82 min	0.00%	B+
HOU to DFW · Dallas-Fort Worththin sample	193	69.0%	68 min	2.59%	C
HOU to DEN · Denverthin sample	192	72.0%	56 min	0.00%	C+
HOU to MSY · New Orleansthin sample	177	86.4%	65 min	0.00%	A+
HOU to MDW · Chicagothin sample	167	77.4%	48 min	1.80%	B
HOU to LAS · Las Vegasthin sample	162	87.0%	39 min	0.00%	A+
HOU to PHX · Phoenixthin sample	159	82.2%	51 min	0.63%	B+
HOU to BNA · Nashvillethin sample	145	73.1%	45 min	0.00%	C+
HOU to MCO · Orlandothin sample	145	71.7%	61 min	0.00%	C+
HOU to SAT · San Antoniothin sample	143	85.2%	39 min	0.00%	A+
HOU to AUS · Austinthin sample	139	79.9%	55 min	0.00%	B+
HOU to STL · St. Louisthin sample	130	76.7%	44 min	0.00%	B+
HOU to BWI · Baltimorethin sample	128	78.0%	56 min	0.78%	B+
HOU to HRL · Harlingenthin sample	113	75.2%	50 min	0.00%	B+
HOU to LGA · New Yorkthin sample	110	76.4%	49 min	0.00%	B+
HOU to MAF · Midlandthin sample	109	80.6%	48 min	0.92%	B+
HOU to OKC · Oklahoma Citythin sample	106	86.7%	49 min	0.00%	A+
HOU to LAX · Los Angelesthin sample	101	85.1%	28 min	0.00%	A+
HOU to DCA · Washingtonthin sample	89	73.9%	48 min	0.00%	C+
HOU to ELP · El Pasothin sample	84	84.5%	57 min	0.00%	B+
HOU to ABQ · Albuquerquethin sample	80	77.5%	60 min	0.00%	B+
HOU to MCI · Kansas Citythin sample	80	73.8%	53 min	0.00%	C+
HOU to TPA · Tampathin sample	79	77.2%	47 min	0.00%	B+
HOU to CRP · Corpus Christithin sample	79	72.2%	64 min	0.00%	C+

Delay causes

What held HOU up in August

One category carries most of the weight here. Late-arriving aircraft accounts for 45% of the 56,000 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
45%
Carrier
26%
National Airspace System
20%
Extreme weather
9%
Security
0%

45% 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 56,000 reported delay minutes here, that single category outweighs weather by 5 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 56,000 reported delay minutes.

Cancellations are rare at 0.37%, below the national 1.08% 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.

6.0% of arrivals land an hour or more late, close to the national 8.2%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.

What to do with this

Flying from HOU in August

For a August trip through HOU: expect 78.2% on time and 0.37% cancelled, going by August 2025. The 5am–8am window was the strongest part of the day.

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