IAH to ATL flight delays
Houston, TX (IAH) Atlanta, GA (ATL) · 689 miles
396 flights · March 2025 – August 2026 · US Bureau of Transportation Statistics
69.33%
Arrived on time
Within 15 minutes of schedule
1.77%
Cancelled
Share of scheduled flights
65 min
When late, late by
Average across delayed arrivals
21 min
Delay per flight
Averaged over every flight flown
What the record says about this route
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.
Flights from Houston to Atlanta run late more often than the average route, though not severely.
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.
Which airline should you fly on this route?
Over March 2025 – August 2026, Delta Air Lines arrived on time most often on IAH to ATL.
Every airline on IAH to ATL
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 | 73.66% | 1.32% | 60 min | C |
| Frontier Airlines | 89 | 58.82% | 4.49% | 69 min | — |
| United Airlines | 80 | 68.35% | 0% | 73 min | — |
The return leg
ATL to IAH Atlanta back to Houston 71.65% on time DOther routes from Houston
Common questions
Are flights from Houston to Atlanta usually delayed?
69.33% of flights on the IAH to ATL 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 Houston to Atlanta?
Only Delta Air Lines appears in the published record on this route, with 227 flights and 73.66% arriving on time.
How often are IAH to ATL flights cancelled?
1.77% of scheduled flights did not operate — about 18 in every thousand. That is in the normal range.
When IAH to ATL flights are late, how late are they?
About 65 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 IAH to ATL 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 →