George Bush Intercontinental/Houston in August 2023

79.0%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 August 2023, reporting carriers scheduled 9,786 domestic departures from George Bush Intercontinental/Houston (IAH). 79.0% left less than 15 minutes late and 79.6% reached their destination on time; 0.9% were cancelled.

Nationally that month, 76.7% of flights departed on time and 76.9% arrived on time, so IAH departures were 2.3 points above the national departure figure.

Flights arriving at IAH that month were on time 81.2% of the time (9,780 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 41%, air carrier 39% and national aviation system 18%.

On time 79.6%
Arrived 15+ minutes late 19.2%
Cancelled 0.9%
Diverted 0.3%

Every scheduled departure from IAH in August 2023, judged by arrival at the destination.

August 2023 against a year earlier, the airport's year and the nation

Measure	Aug 2023	Year earlier	IAH, 12 months to Jul 2026	All reported flights, Aug 2023
Departed on time	79.0%	—	78.1%	76.7%
Arrived on time	79.6%	—	77.6%	76.9%
Cancelled	0.9%	—	1.1%	1.5%
Average departure delay (late minutes only)	15.5 min	—	17.2 min	17.3 min
Scheduled departures a day	326	—	326	20,100
Scheduled departures	9,786	—	119,020	602,987

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
UA United Airlines	6,015	61%	79.8%	3.7 min	0.8%
OO SkyWest Airlines	835	9%	81.9%	8.4 min	0.1%
DL Delta Air Lines	706	7%	81.0%	7.6 min	1.7%
AA American Airlines	683	7%	80.1%	6.1 min	1.2%
NK Spirit Airlines	605	6%	69.8%	15.1 min	0.5%
WN Southwest Airlines	510	5%	87.8%	-2.9 min	1.2%
F9 Frontier Airlines	130	1%	59.2%	26.4 min	4.6%
B6 JetBlue Airways	93	1%	54.8%	41.2 min	3.2%
AS Alaska Airlines	89	1%	86.5%	-3.8 min	0.0%
MQ Envoy Air	70	1%	90.0%	-5.6 min	0.0%
YX Republic Airline	50	1%	96.0%	-19.7 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
IAH–LAX	Houston to Los Angeles	492	85.6%	-2.5 min	0.4%
IAH–DEN	Houston to Denver	462	76.6%	3.5 min	1.1%
IAH–DFW	Houston to Dallas/Fort Worth	458	77.1%	10.1 min	0.7%
IAH–ATL	Houston to Atlanta	439	72.4%	13.6 min	1.6%
IAH–ORD	Houston to Chicago	397	79.1%	6.0 min	0.5%
IAH–LGA	Houston to New York	347	81.8%	0.7 min	2.0%
IAH–LAS	Houston to Las Vegas	314	83.4%	-0.8 min	1.0%
IAH–EWR	Houston to Newark	308	84.4%	0.1 min	2.6%
IAH–MIA	Houston to Miami	286	80.4%	6.6 min	1.7%
IAH–SFO	Houston to San Francisco	280	82.9%	-1.1 min	0.4%
IAH–MCO	Houston to Orlando	274	67.9%	13.6 min	1.1%
IAH–MSY	Houston to New Orleans	268	81.0%	2.2 min	0.4%

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), August 2023.

Delay causes

BTS cause category	Share of delay minutes	National, Aug 2023	Minutes
Air carrier	39.4%	36.7%	52,258
Late-arriving aircraft	41.1%	42.2%	54,523
National Aviation System	17.5%	15.7%	23,182
Extreme weather	2.0%	5.1%	2,606
Security	0.1%	0.2%	129

132,698 delay minutes on 1,878 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 August 2023?

79.0% of 9,786 scheduled domestic departures left less than 15 minutes late, and 79.6% reached their destination on time. The national figures that month were 76.7% and 76.9%.

How does that compare with a year earlier?

August 2022 is outside the 36 months on file, or the airport had too few reported flights that month.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for August 2023; 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.