What was measured for DFW → IAH?
The U.S. Department of Transportation's Bureau of Transportation Statistics recorded 459 scheduled-flight records in this August sample for US domestic departures between these two airport codes. The reported on-time arrival rate is 76.3% among flights with known arrival-delay observations that were not cancelled. Cancellation and diversion rates use all reported scheduled flights as their denominators.
This dataset does not establish which flights are operating now, which individual flight was delayed or why, or whether passenger compensation applies. Statistics for one month are not a guarantee for the next.
August 2026 flight outcomes
- Flights in sample
- 459
- Arrived on time
- 76.3%
- Cancelled
- 0.7%
- Diverted
- 0.2%
- Mean arrival delay
- 13.1 min
- Median arrival delay
- -5.0 min
For this report, an arrival delay of 15 minutes or more counts as late. Negative mean/median delay minutes mean that, on that measure, flights arrived ahead of schedule on average. Delayed/cancelled flights may have very different passenger impacts.
July versus August 2026
This scope also has a separately observed July BTS record. July contained 482 scheduled flights, with 64.3% arriving on time and 0.6% cancelled. August contained 459 flights, with 76.3% arriving on time and 0.7% cancelled.
The August on-time share differs from July by +12.0 percentage points. This is a comparison of two historical samples, not a statistically tested future trend.
Original July 2026 BTS archive · Original August 2026 BTS archive
Earlier detailed July 2026 AeroDue report for this same scope
Observed departure-hour patterns
Each row covers flights associated with a recorded scheduled departure hour. Only hour groups with at least ten records are displayed. A stronger or weaker historic hour does not guarantee the outcome of a particular future flight.
| Departure hour | Sample | On time | Cancelled | Mean delay |
|---|---|---|---|---|
| 05:00 | 31 | 93.5% | 0.0% | -10.7 min |
| 07:00 | 58 | 94.8% | 0.0% | -5.6 min |
| 08:00 | 27 | 85.2% | 0.0% | 0.4 min |
| 09:00 | 57 | 82.1% | 1.8% | 2.6 min |
| 11:00 | 11 | 90.9% | 0.0% | 2.8 min |
| 12:00 | 49 | 79.6% | 0.0% | 6.7 min |
| 14:00 | 32 | 80.6% | 0.0% | 31.1 min |
| 15:00 | 21 | 90.5% | 0.0% | 4.9 min |
| 16:00 | 40 | 63.2% | 5.0% | 29.3 min |
| 17:00 | 54 | 72.2% | 0.0% | 16.9 min |
| 19:00 | 34 | 58.8% | 0.0% | 39.7 min |
| 21:00 | 31 | 32.3% | 0.0% | 41.6 min |
| 22:00 | 11 | 63.6% | 0.0% | 12.5 min |
What stands out in the DFW → IAH results?
In this specific directional route sample, BTS recorded 459 flights, an observed on-time arrival share of 76.3%, and an observed cancellation share of 0.7%. These percentages apply to this scope and month only, not to other routes or future travel.
For exactly this reporting scope, the July sample contained 482 flights and 64.3% on-time arrivals. The August on-time share was +12.0 percentage points relative to July. This comparison does not establish a trend beyond the observed months.
Within the published departure-hour cohorts, 07:00 had the highest observed on-time share (94.8% across 58 records), while 21:00 had the lowest (32.3% across 31 records). These are descriptive sample extremes, not a reliable recommendation about when to book.
Evidence, scope and limitations
Source: U.S. DOT BTS — August 2026 original reporting-carrier on-time file. Source period: 1–31 August 2026. Observation generated: . Methodology: BTS monthly v1. Data licence: public-domain U.S. Government.
Direction is essential: DFW-IAH is not a report for the reverse route. The outcome aggregates do not identify the cause of an individual delay or prove any legal entitlement.