George Bush Intercontinental/Houston in July 2025

67.6%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 July 2025, reporting carriers scheduled 10,311 domestic departures from George Bush Intercontinental/Houston (IAH). 67.6% left less than 15 minutes late and 67.2% reached their destination on time; 1.7% were cancelled.

Nationally that month, 69.7% of flights departed on time and 69.0% arrived on time, so IAH departures were 2.1 points below the national departure figure.

A year earlier, in July 2024, the airport had 10,383 departures with 53.5% leaving on time: a change of +14.1 points, with flights down 1%.

Flights arriving at IAH that month were on time 70.9% of the time (10,314 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 41%, air carrier 30% and national aviation system 18%.

On time 67.2%
Arrived 15+ minutes late 30.5%
Cancelled 1.7%
Diverted 0.6%

Every scheduled departure from IAH in July 2025, judged by arrival at the destination.

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

Measure	Jul 2025	Jul 2024	IAH, 12 months to Jul 2026	All reported flights, Jul 2025
Departed on time	67.6%	53.5%	78.1%	69.7%
Arrived on time	67.2%	53.1%	77.6%	69.0%
Cancelled	1.7%	7.7%	1.1%	2.5%
Average departure delay (late minutes only)	29.1 min	38.4 min	17.2 min	24.3 min
Scheduled departures a day	344	346	326	21,048
Scheduled departures	10,311	10,383	119,020	631,428

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
UA United Airlines	6,013	58%	66.0%	21.1 min	1.4%
OO SkyWest Airlines	1,551	15%	68.9%	23.8 min	1.7%
DL Delta Air Lines	717	7%	74.2%	12.7 min	1.1%
AA American Airlines	681	7%	64.0%	37.2 min	3.8%
NK Spirit Airlines	666	6%	71.6%	15.8 min	2.3%
F9 Frontier Airlines	320	3%	61.9%	26.2 min	0.9%
MQ Envoy Air	159	2%	71.1%	13.6 min	5.0%
AS Alaska Airlines	123	1%	73.2%	5.7 min	1.6%
B6 JetBlue Airways	62	1%	54.8%	23.3 min	4.8%
YX Republic Airline	19	0%	47.4%	34.5 min	5.3%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
IAH–ORD	Houston to Chicago	514	65.0%	23.1 min	1.6%
IAH–DFW	Houston to Dallas/Fort Worth	457	65.2%	27.7 min	4.6%
IAH–LAX	Houston to Los Angeles	454	77.3%	7.2 min	1.1%
IAH–ATL	Houston to Atlanta	413	70.7%	15.6 min	1.5%
IAH–DEN	Houston to Denver	402	71.4%	13.0 min	0.0%
IAH–LGA	Houston to New York	380	60.8%	23.7 min	2.9%
IAH–EWR	Houston to Newark	341	59.5%	28.2 min	5.0%
IAH–MIA	Houston to Miami	312	64.1%	18.9 min	2.6%
IAH–MCO	Houston to Orlando	304	62.8%	23.9 min	1.0%
IAH–SFO	Houston to San Francisco	299	73.9%	15.8 min	0.0%
IAH–LAS	Houston to Las Vegas	291	74.9%	10.1 min	0.7%
IAH–MSY	Houston to New Orleans	242	66.5%	19.6 min	1.7%

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), July 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Jul 2025	Minutes
Air carrier	29.6%	31.1%	81,860
Late-arriving aircraft	40.5%	40.8%	112,212
National Aviation System	18.0%	20.7%	49,910
Extreme weather	11.8%	7.3%	32,766
Security	0.0%	0.1%	17

276,765 delay minutes on 3,142 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 IAH on time in July 2025?

67.6% of 10,311 scheduled domestic departures left less than 15 minutes late, and 67.2% reached their destination on time. The national figures that month were 69.7% and 69.0%.

How does that compare with a year earlier?

In July 2024, 53.5% of 10,383 departures left on time and 7.7% were cancelled, against 67.6% and 1.7% in July 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for July 2025; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for IAH · methodology · corrections.