Routes › Atlanta (ATL) › ATL to IAH
Route · 12 months to July 2026
Atlanta to Houston: on-time record
Hartsfield-Jackson Atlanta International to George Bush Intercontinental/Houston
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. Data through July 2026; this is a monthly history, not live flight status.
In the 12 months to July 2026, reporting carriers scheduled 4,926 flights from Atlanta (ATL) to Houston (IAH), a distance of 689 miles. 74.9% of them arrived within 15 minutes of schedule.
That is 1.1 points below the national on-time share of 76.0% for the same period and 1.7 points below the 76.6% recorded for all departures from ATL. Flights that did arrive were 7.8 min late on average, and 1.8% of scheduled flights were cancelled (national: 1.8%).
4 reporting carriers flew the route at least 60 times. United Airlines had the highest on-time share at 84.1% of 1,261 flights; Spirit Airlines had the lowest at 62.3% of 342.
By scheduled departure hour (local time at ATL), flights leaving from 11 am to 12 pm had the highest on-time share, 87.6%; those leaving from 6 pm to 7 pm had the lowest, 59.9%.
The on-time share is up 2.5 points on the previous 12 months (72.4%); cancellations moved from 1.6% to 1.8%.
Of the delay minutes that carriers assigned to a BTS cause category on this route, air carrier 39%, late-arriving aircraft 34% and national aviation system 24%.
- On time 74.9%
- Arrived 15+ minutes late 23.1%
- Cancelled 1.8%
- Diverted 0.1%
Airlines on the route compared
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| DL Delta Air Lines | 2,521 | 51% | 74.0% | 8.0 min | 1.9% |
| UA United Airlines | 1,261 | 26% | 84.1% | -0.6 min | 0.8% |
| F9 Frontier Airlines | 798 | 16% | 68.8% | 15.5 min | 1.9% |
| NK Spirit Airlines | 342 | 7% | 62.3% | 19.9 min | 5.0% |
Carriers with at least 24 flights in the 12 months to July 2026. The on-time pill is green when a carrier is at or above the route's overall share. Regional carriers operate flights sold under larger airlines' brands; BTS lists the carrier that operated the flight.
Compared with the airports and the nation
| Measure | ATL to IAH | All departures from ATL | All arrivals at IAH | All reported flights |
|---|---|---|---|---|
| Arrived on time | 74.9% | 76.6% | 79.5% | 76.0% |
| Arrived 15+ minutes late | 23.1% | 21.3% | 19.1% | 21.9% |
| Cancelled | 1.8% | 1.8% | 1.1% | 1.8% |
| Diverted | 0.1% | 0.3% | 0.2% | 0.3% |
| Average arrival delay | 7.8 min | 7.9 min | 4.6 min | 8.1 min |
| Delay minutes per 100 flights | 1,620 | 1,499 | 1,522 | 1,684 |
| Scheduled flights | 4,926 | 315,859 | 119,011 | 7,043,858 |
12 months to July 2026. Delay minutes count late arrivals only (an early arrival is zero), so the per-100-flights row is a normalised total rather than an average of early and late.
The return direction, IAH to ATL, recorded 75.5% on time across 4,919 flights in the same period.
Month by month
Year on year: on time 74.9% against 72.4% (+2.5 pts), cancelled 1.8% against 1.6%, flights 4,926 against 4,541.
By scheduled departure hour
Delay causes
Seasonality
| Calendar month | Flights | On time | Cancelled | Avg arrival delay | Years in sample |
|---|---|---|---|---|---|
| Jan | 1,050 | 71.0% | 4.5% | 12.4 min | 3 |
| Feb | 1,018 | 82.6% | 0.1% | 0.9 min | 3 |
| Mar | 1,177 | 75.8% | 2.6% | 7.6 min | 3 |
| Apr | 1,168 | 78.5% | 0.4% | 8.6 min | 3 |
| May | 1,239 | 63.9% | 0.7% | 19.1 min | 3 |
| Jun | 1,188 | 65.5% | 2.0% | 18.7 min | 3 |
| Jul | 1,235 | 60.2% | 4.6% | 22.5 min | 3 |
| Aug | 1,242 | 73.6% | 1.5% | 11.1 min | 3 |
| Sep | 1,168 | 81.3% | 0.9% | 3.7 min | 3 |
| Oct | 1,261 | 84.0% | 0.3% | 4.5 min | 3 |
| Nov | 1,114 | 82.3% | 1.0% | 4.4 min | 3 |
| Dec | 1,050 | 74.1% | 1.2% | 7.9 min | 3 |
Each calendar month summed across the 36 months on file, so most rows combine three years. The pill compares the month with the route's own 12-month share.
Other routes from Atlanta (ATL)
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| ATL–LGA | Atlanta to New York | 8,413 | 69.6% | 13.8 min | 4.1% |
| ATL–MCO | Atlanta to Orlando | 8,208 | 69.3% | 17.7 min | 1.5% |
| ATL–FLL | Atlanta to Fort Lauderdale | 7,265 | 69.0% | 14.4 min | 2.3% |
| ATL–DCA | Atlanta to Washington | 6,800 | 67.3% | 15.9 min | 3.2% |
| ATL–DFW | Atlanta to Dallas/Fort Worth | 6,689 | 71.7% | 15.1 min | 2.6% |
| ATL–ORD | Atlanta to Chicago | 6,440 | 68.6% | 18.3 min | 2.4% |
| ATL–MIA | Atlanta to Miami | 6,268 | 70.1% | 15.1 min | 1.6% |
| ATL–EWR | Atlanta to Newark | 6,265 | 69.7% | 14.6 min | 3.5% |
All 153 routes and the airport record for ATL · airport record for IAH
Questions and answers
How often are flights from Atlanta to Houston on time?
74.9% of the 4,926 flights scheduled from ATL to IAH in the 12 months to July 2026 arrived less than 15 minutes after their scheduled time. The national share for the same period was 76.0%. Cancelled and diverted flights count as not on time.
Which airline has the highest on-time share from ATL to IAH?
Among reporting carriers with at least 60 flights on the route, United Airlines had the highest on-time share (84.1%), followed by Delta Air Lines (74.0%) and Frontier Airlines (68.8%). Differences of a point or two on a few hundred flights are small.
What causes delays between Atlanta and Houston?
For flights that arrived 15 or more minutes late, carriers attributed the delay minutes as follows: air carrier 39%, late-arriving aircraft 34%, national aviation system 24%, extreme weather 3%, security 0%. The categories are the carriers' own reports to BTS; weather that slows the wider system is usually recorded under the National Aviation System rather than extreme weather.
What time of day has the highest on-time share from ATL?
Flights scheduled to leave ATL from 11 am to 12 pm arrived on time 87.6% of the time, the highest of any hour with enough flights to compare. The lowest was 6 pm to 7 pm at 59.9%. Delays tend to build through the day as late aircraft carry over to later flights.
Is it getting better?
The on-time share for the 12 months to July 2026 was 74.9%, up 2.5 points on the previous 12 months (72.4%). The monthly chart on this page shows each of the last 36 months. Across those months, October had the highest on-time share (84.0%) and July the lowest (60.2%).
Where does this data come from?
Every figure is computed from the Bureau of Transportation Statistics Reporting Carrier On-Time Performance files, which list each scheduled domestic flight by the carriers required to report. This page covers August 2023 to July 2026. It shows totals and averages only; it is not a live flight-status service.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987 to present), monthly files August 2023 to July 2026, a US government work in the public domain. Figures are totals and averages over all scheduled flights by reporting carriers on the route; no individual flight or aircraft is identified. Times are local to the departure airport. The load factor and passenger counts from the BTS T-100 series are not included in this edition. See the methodology; report processing errors through corrections.