MIA to IAH flight delays
Miami, FL (MIA) Houston, TX (IAH) · 964 miles
277 flights · March 2025 – August 2026 · US Bureau of Transportation Statistics
79.06%
Arrived on time
Within 15 minutes of schedule
0%
Cancelled
Share of scheduled flights
73 min
When late, late by
Average across delayed arrivals
16 min
Delay per flight
Averaged over every flight flown
What the record says about this route
Which airline you fly changes the odds here. United Airlines arrived on time 10 points more often than American Airlines over the same period on the same route — same airports, same weather, same air traffic control. A gap that survives all of that is about how the two airlines are run.
The shape of the lateness matters here. Flights on this route are not late often, but when they are late they are late by about 73 minutes — long enough to lose a connection or an evening. The on-time percentage looks reassuring and understates the consequence of being on the wrong flight.
This is a thin route — 277 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.
The Miami to Houston route sits close to the middle of the record — neither notably punctual nor notably late.
Which airline should you fly on this route?
Over March 2025 – August 2026, United Airlines arrived on time most often on MIA to IAH. American Airlines was late most often.
Every airline on MIA 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 |
|---|---|---|---|---|---|
| American Airlines | 143 | 72.73% | 0% | 55 min | C |
| United Airlines | 110 | 82.73% | 0% | 110 min | B |
| Frontier Airlines | 23 | 100% | 0% | — | — |
| Envoy Air | 1 | 100% | 0% | — | — |
The return leg
IAH to MIA Houston back to Miami 75.09% on time COther routes from Miami
Common questions
Are flights from Miami to Houston usually delayed?
79.06% of flights on the MIA to IAH route arrived within 15 minutes of schedule, so roughly 2 in every ten arrived late. That is about the same as the average route in this record.
Which airline is most on time from Miami to Houston?
United Airlines, at 82.73% on time across 110 flights. The least punctual on the route was American Airlines at 72.73%.
How often are MIA to IAH flights cancelled?
0% of scheduled flights did not operate — about 1 in every thousand. That is in the normal range.
When MIA to IAH flights are late, how late are they?
About 73 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 MIA 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 →