George Bush Intercontinental/Houston in March 2025

78.7%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 March 2025, reporting carriers scheduled 9,849 domestic departures from George Bush Intercontinental/Houston (IAH). 78.7% left less than 15 minutes late and 78.7% reached their destination on time; 0.7% were cancelled.

Nationally that month, 79.9% of flights departed on time and 79.3% arrived on time, so IAH departures were 1.2 points below the national departure figure.

A year earlier, in March 2024, the airport had 9,557 departures with 76.2% leaving on time: a change of +2.5 points, with flights up 3%.

Flights arriving at IAH that month were on time 82.8% of the time (9,851 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 37%, late-arriving aircraft 34% and national aviation system 24%.

On time 78.7%
Arrived 15+ minutes late 20.3%
Cancelled 0.7%
Diverted 0.4%

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

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

Measure	Mar 2025	Mar 2024	IAH, 12 months to Jul 2026	All reported flights, Mar 2025
Departed on time	78.7%	76.2%	78.1%	79.9%
Arrived on time	78.7%	76.8%	77.6%	79.3%
Cancelled	0.7%	0.6%	1.1%	1.2%
Average departure delay (late minutes only)	15.9 min	18.8 min	17.2 min	14.9 min
Scheduled departures a day	328	319	326	20,029
Scheduled departures	9,849	9,557	119,020	600,872

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
UA United Airlines	5,870	60%	81.1%	2.6 min	0.2%
OO SkyWest Airlines	1,281	13%	74.2%	14.1 min	1.3%
NK Spirit Airlines	756	8%	78.0%	5.4 min	0.9%
DL Delta Air Lines	675	7%	82.7%	3.7 min	0.3%
AA American Airlines	565	6%	75.0%	14.6 min	2.1%
F9 Frontier Airlines	379	4%	60.2%	23.1 min	2.4%
MQ Envoy Air	127	1%	78.7%	1.6 min	2.4%
AS Alaska Airlines	62	1%	75.8%	0.1 min	1.6%
B6 JetBlue Airways	62	1%	67.7%	30.0 min	0.0%
YX Republic Airline	51	1%	74.5%	4.1 min	2.0%
OH PSA Airlines	21	0%	61.9%	13.6 min	4.8%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
IAH–DFW	Houston to Dallas/Fort Worth	513	73.1%	16.6 min	2.3%
IAH–ORD	Houston to Chicago	460	79.6%	4.5 min	0.9%
IAH–LAX	Houston to Los Angeles	445	88.5%	-3.9 min	0.2%
IAH–DEN	Houston to Denver	372	83.1%	0.2 min	0.5%
IAH–ATL	Houston to Atlanta	366	77.6%	7.0 min	0.0%
IAH–PHX	Houston to Phoenix	343	81.9%	2.7 min	0.3%
IAH–MIA	Houston to Miami	339	73.7%	13.3 min	1.2%
IAH–LAS	Houston to Las Vegas	336	81.8%	1.0 min	0.9%
IAH–MCO	Houston to Orlando	324	79.0%	3.5 min	0.6%
IAH–LGA	Houston to New York	323	71.8%	9.4 min	0.6%
IAH–EWR	Houston to Newark	308	76.6%	5.6 min	0.0%
IAH–SFO	Houston to San Francisco	284	79.6%	3.2 min	0.0%

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), March 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Mar 2025	Minutes
Air carrier	36.9%	33.0%	51,748
Late-arriving aircraft	34.0%	39.2%	47,768
National Aviation System	24.3%	21.9%	34,088
Extreme weather	4.8%	5.9%	6,712
Security	0.0%	0.1%	47

140,363 delay minutes on 1,999 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 March 2025?

78.7% of 9,849 scheduled domestic departures left less than 15 minutes late, and 78.7% reached their destination on time. The national figures that month were 79.9% and 79.3%.

How does that compare with a year earlier?

In March 2024, 76.2% of 9,557 departures left on time and 0.6% were cancelled, against 78.7% and 0.7% in March 2025.

Provenance

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