George Bush Intercontinental/Houston in October 2023

83.4%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 October 2023, reporting carriers scheduled 9,918 domestic departures from George Bush Intercontinental/Houston (IAH). 83.4% left less than 15 minutes late and 82.3% reached their destination on time; 0.4% were cancelled.

Nationally that month, 83.8% of flights departed on time and 84.0% arrived on time, so IAH departures were level with the national departure figure.

Flights arriving at IAH that month were on time 84.8% of the time (9,932 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 43%, late-arriving aircraft 40% and national aviation system 15%.

On time 82.3%
Arrived 15+ minutes late 17.2%
Cancelled 0.4%
Diverted 0.1%

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

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

Measure	Oct 2023	Year earlier	IAH, 12 months to Jul 2026	All reported flights, Oct 2023
Departed on time	83.4%	—	78.1%	83.8%
Arrived on time	82.3%	—	77.6%	84.0%
Cancelled	0.4%	—	1.1%	0.4%
Average departure delay (late minutes only)	13.2 min	—	17.2 min	11.0 min
Scheduled departures a day	331	—	326	19,966
Scheduled departures	9,918	—	119,020	598,968

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
UA United Airlines	5,878	59%	83.2%	0.2 min	0.1%
OO SkyWest Airlines	1,191	12%	81.6%	9.1 min	0.1%
DL Delta Air Lines	684	7%	89.6%	1.0 min	0.1%
NK Spirit Airlines	639	6%	80.3%	4.3 min	3.1%
AA American Airlines	579	6%	77.5%	16.1 min	1.7%
WN Southwest Airlines	468	5%	82.9%	1.2 min	0.4%
F9 Frontier Airlines	148	1%	72.3%	15.3 min	1.4%
MQ Envoy Air	144	1%	71.5%	7.2 min	0.0%
AS Alaska Airlines	89	1%	87.6%	-7.4 min	0.0%
B6 JetBlue Airways	86	1%	51.2%	120.1 min	0.0%
YX Republic Airline	12	0%	58.3%	79.7 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
IAH–LAX	Houston to Los Angeles	458	88.4%	-0.6 min	0.0%
IAH–DFW	Houston to Dallas/Fort Worth	440	63.9%	20.8 min	2.3%
IAH–DEN	Houston to Denver	412	83.0%	0.5 min	0.0%
IAH–ATL	Houston to Atlanta	398	84.7%	2.0 min	0.8%
IAH–ORD	Houston to Chicago	387	84.0%	0.1 min	1.6%
IAH–LAS	Houston to Las Vegas	384	81.3%	4.6 min	0.3%
IAH–EWR	Houston to Newark	339	85.8%	-6.6 min	0.0%
IAH–MCO	Houston to Orlando	304	78.3%	1.8 min	2.0%
IAH–LGA	Houston to New York	298	85.6%	0.1 min	1.0%
IAH–SFO	Houston to San Francisco	277	84.8%	-2.5 min	0.0%
IAH–MSY	Houston to New Orleans	257	85.2%	3.5 min	0.0%
IAH–MIA	Houston to Miami	241	75.5%	12.3 min	1.2%

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), October 2023.

Delay causes

BTS cause category	Share of delay minutes	National, Oct 2023	Minutes
Air carrier	42.7%	41.3%	49,465
Late-arriving aircraft	39.8%	40.5%	46,000
National Aviation System	15.1%	14.4%	17,527
Extreme weather	2.3%	3.7%	2,685
Security	0.0%	0.2%	38

115,715 delay minutes on 1,703 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 October 2023?

83.4% of 9,918 scheduled domestic departures left less than 15 minutes late, and 82.3% reached their destination on time. The national figures that month were 83.8% and 84.0%.

How does that compare with a year earlier?

October 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 October 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.