Houston (IAH) to Miami (MIA): On-Time Performance
Data through July 2026
Houston (IAH) to Miami (MIA) effectively runs on two schedules. In October 2024, 89% of arrivals were on time; in July 2024 that fell to 58% — a 30-point seasonal swing. Across the full period the route averages 76% on-time against a national 78%. Morning departures also hold up better than evening ones (83% vs 67%), which matters most in the rough months.
- On-time
- 76%
- arrived <15 min late
- Avg delay
- 22 min
- completed flights
- Cancelled
- 1.7%
- Flights/day
- 10
- last 12 months
- Duration
- 2h 37m
- scheduled
- Distance
- 964 mi
Best airline from IAH to MIA
5 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Envoy Airmost reliable | 81% | 13 min | 1.1% | 282 |
| United Airlines | 79% | 15 min | 0.9% | 2,933 |
| American Airlines | 76% | 27 min | 1.9% | 3,127 |
| Spirit Airlines | 74% | 22 min | 2.9% | 1,014 |
| Frontier Airlines | 64% | 54 min | 4.1% | 269 |
Monthly on-time trend
Best time to fly from IAH to MIA
Aim for departures around 5 a.m. (89% on-time); avoid 8 p.m. departures (62%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 77% | 25 min |
| Tuesdaybest | 82% | 22 min |
| Wednesday | 80% | 19 min |
| Thursday | 75% | 20 min |
| Friday | 76% | 23 min |
| Saturday | 74% | 23 min |
| Sunday | 71% | 25 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 operations33%
- National airspace system20%
- Weather8%
Frequently asked questions
- How often are flights from IAH to MIA delayed?
- 24% of IAH–MIA 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 22 minutes.
- Which airline is most reliable from IAH to MIA?
- Envoy Air has the best on-time record on this route at 81%, based on 282 flights. 5 airlines flew IAH–MIA frequently enough to compare in this period.
- What is the best time of day to fly from IAH to MIA?
- Departures around 5 a.m. have the best record (89% on-time), while departures around 8 p.m. have the worst (62%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from IAH to MIA?
- The scheduled IAH–MIA flight time averages 2h 37m over 964 miles. Actual arrival times vary — flights on this route land 15+ minutes late 24% of the time.
- How often are IAH to MIA flights cancelled?
- 1.7% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, slightly above the national rate of 1.6%.
- What is the worst month to fly from IAH to MIA?
- July 2024 was the roughest month in this dataset, with only 58% of arrivals on time. The best was October 2024 at 89%. If your dates are flexible, that 30-point gap is worth planning around.
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Based on 7,639 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.