Airports › Houston (IAH) › August 2025
Airport month · August 2025
George Bush Intercontinental/Houston in August 2025
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 2025, reporting carriers scheduled 9,889 domestic departures from George Bush Intercontinental/Houston (IAH). 74.1% left less than 15 minutes late and 73.3% reached their destination on time; 0.9% were cancelled.
Nationally that month, 76.8% of flights departed on time and 76.3% arrived on time, so IAH departures were 2.7 points below the national departure figure.
A year earlier, in August 2024, the airport had 10,284 departures with 74.0% leaving on time: a change of +0.1 points, with flights down 4%.
Flights arriving at IAH that month were on time 75.7% of the time (9,891 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 38%, air carrier 34% and national aviation system 21%.
- On time 73.3%
- Arrived 15+ minutes late 25.6%
- Cancelled 0.9%
- Diverted 0.3%
August 2025 against a year earlier, the airport's year and the nation
| Measure | Aug 2025 | Aug 2024 | IAH, 12 months to Jul 2026 | All reported flights, Aug 2025 |
|---|---|---|---|---|
| Departed on time | 74.1% | 74.0% | 78.1% | 76.8% |
| Arrived on time | 73.3% | 74.4% | 77.6% | 76.3% |
| Cancelled | 0.9% | 1.5% | 1.1% | 1.1% |
| Average departure delay (late minutes only) | 20.5 min | 19.7 min | 17.2 min | 17.6 min |
| Scheduled departures a day | 330 | 343 | 326 | 20,079 |
| Scheduled departures | 9,889 | 10,284 | 119,020 | 602,378 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| UA United Airlines | 5,971 | 60% | 73.3% | 10.2 min | 0.7% |
| OO SkyWest Airlines | 1,260 | 13% | 74.5% | 10.4 min | 0.1% |
| AA American Airlines | 696 | 7% | 65.8% | 36.8 min | 2.9% |
| DL Delta Air Lines | 695 | 7% | 81.2% | 4.2 min | 0.6% |
| NK Spirit Airlines | 630 | 6% | 76.7% | 7.3 min | 0.6% |
| F9 Frontier Airlines | 320 | 3% | 65.9% | 22.0 min | 2.2% |
| AS Alaska Airlines | 121 | 1% | 71.9% | 3.8 min | 1.7% |
| MQ Envoy Air | 79 | 1% | 65.8% | 21.4 min | 1.3% |
| YX Republic Airline | 59 | 1% | 64.4% | 12.0 min | 3.4% |
| B6 JetBlue Airways | 54 | 1% | 59.3% | 25.5 min | 1.9% |
| OH PSA Airlines | 4 | 0% | 50.0% | 75.5 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| IAH–ORD | Houston to Chicago | 535 | 71.6% | 15.0 min | 2.1% |
| IAH–DFW | Houston to Dallas/Fort Worth | 465 | 62.4% | 32.9 min | 2.6% |
| IAH–LAX | Houston to Los Angeles | 442 | 85.1% | -4.8 min | 0.9% |
| IAH–DEN | Houston to Denver | 403 | 72.7% | 10.5 min | 0.2% |
| IAH–ATL | Houston to Atlanta | 379 | 78.6% | 6.6 min | 1.3% |
| IAH–LGA | Houston to New York | 376 | 71.8% | 9.9 min | 0.8% |
| IAH–EWR | Houston to Newark | 338 | 68.6% | 15.7 min | 0.3% |
| IAH–MCO | Houston to Orlando | 300 | 64.3% | 21.0 min | 0.7% |
| IAH–MIA | Houston to Miami | 300 | 70.7% | 19.3 min | 0.7% |
| IAH–SFO | Houston to San Francisco | 299 | 79.9% | 4.4 min | 0.7% |
| IAH–LAS | Houston to Las Vegas | 286 | 78.3% | 5.5 min | 1.0% |
| IAH–MSY | Houston to New Orleans | 248 | 80.2% | 4.7 min | 0.4% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left IAH on time in August 2025?
74.1% of 9,889 scheduled domestic departures left less than 15 minutes late, and 73.3% reached their destination on time. The national figures that month were 76.8% and 76.3%.
How does that compare with a year earlier?
In August 2024, 74.0% of 10,284 departures left on time and 1.5% were cancelled, against 74.1% and 0.9% in August 2025.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for August 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.