Miami (MIA) to Houston (IAH): On-Time Performance
Data through July 2026
Miami (MIA) to Houston (IAH) effectively runs on two schedules. In November 2024, 87% of arrivals were on time; in July 2024 that fell to 62% — a 25-point seasonal swing. Across the full period the route averages 75% on-time against a national 78%. Morning departures also hold up better than evening ones (89% vs 65%), which matters most in the rough months.
- On-time
- 75%
- arrived <15 min late
- Avg delay
- 20 min
- completed flights
- Cancelled
- 1.6%
- Flights/day
- 10
- last 12 months
- Duration
- 2h 59m
- scheduled
- Distance
- 964 mi
Best airline from MIA to IAH
5 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Envoy Airmost reliable | 89% | 6 min | 1.1% | 282 |
| United Airlines | 82% | 16 min | 1.0% | 2,930 |
| Spirit Airlines | 76% | 22 min | 2.5% | 1,016 |
| Frontier Airlines | 74% | 24 min | 3.7% | 270 |
| American Airlines | 68% | 24 min | 1.8% | 3,130 |
Monthly on-time trend
Best time to fly from MIA to IAH
Aim for departures around 6 a.m. (95% on-time); avoid 5 p.m. departures (59%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 77% | 25 min |
| Tuesdaybest | 80% | 14 min |
| Wednesday | 78% | 16 min |
| Thursday | 75% | 20 min |
| Friday | 75% | 19 min |
| Saturday | 74% | 20 min |
| Sunday | 70% | 26 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft38%
- Airline operations30%
- National airspace system26%
- Weather6%
Frequently asked questions
- How often are flights from MIA to IAH delayed?
- 25% of MIA–IAH flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 20 minutes.
- Which airline is most reliable from MIA to IAH?
- Envoy Air has the best on-time record on this route at 89%, based on 282 flights. 5 airlines flew MIA–IAH frequently enough to compare in this period.
- What is the best time of day to fly from MIA to IAH?
- Departures around 6 a.m. have the best record (95% on-time), while departures around 5 p.m. have the worst (59%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from MIA to IAH?
- The scheduled MIA–IAH flight time averages 2h 59m over 964 miles. Actual arrival times vary — flights on this route land 15+ minutes late 25% of the time.
- How often are MIA to IAH flights cancelled?
- 1.6% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from MIA to IAH?
- July 2024 was the roughest month in this dataset, with only 62% of arrivals on time. The best was November 2024 at 87%. If your dates are flexible, that 25-point gap is worth planning around.
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Based on 7,642 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.