ATL to IAH flight delays
Atlanta, GA (ATL) Houston, TX (IAH) · 689 miles
396 flights · March 2025 – August 2026 · US Bureau of Transportation Statistics
71.65%
Arrived on time
Within 15 minutes of schedule
1.77%
Cancelled
Share of scheduled flights
63 min
When late, late by
Average across delayed arrivals
19 min
Delay per flight
Averaged over every flight flown
What the record says about this route
This route does worse than its own airport. ATL as a whole runs 7.8 points more punctual than these flights, which points at something specific to the route — the time of day it is scheduled, or the aircraft that feed it — rather than the airport.
Only Delta Air Lines flies this route in the published record, so there is no choice to weigh — the route's figures and the airline's are the same figures.
This is a thin route — 396 flights across the whole period. On a route this infrequent a cancellation is far more costly than the rate suggests, because the next departure may not be the same day.
Flights from Atlanta to Houston run late more often than the average route, though not severely.
Which airline should you fly on this route?
Over March 2025 – August 2026, Delta Air Lines arrived on time most often on ATL to IAH.
Every airline on ATL to IAH
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Delta Air Lines | 227 | 68.16% | 1.32% | 54 min | D |
| Frontier Airlines | 89 | 80% | 4.49% | 64 min | — |
| United Airlines | 80 | 72.5% | 0% | 92 min | — |
The return leg
IAH to ATL Houston back to Atlanta 69.33% on time DOther routes from Atlanta
Common questions
Are flights from Atlanta to Houston usually delayed?
71.65% of flights on the ATL to IAH route arrived within 15 minutes of schedule, so roughly 3 in every ten arrived late. That is worse than the average route in this record.
Which airlines fly from Atlanta to Houston?
Only Delta Air Lines appears in the published record on this route, with 227 flights and 68.16% arriving on time.
How often are ATL to IAH flights cancelled?
1.77% of scheduled flights did not operate — about 18 in every thousand. That is in the normal range.
When ATL to IAH flights are late, how late are they?
About 63 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on ATL to IAH during March 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →