Best Time to Fly MIA to IAH: On-Time Stats by Hour & Airline
Miami International → George Bush Intercontinental/Houston
Data through July 2026 · Last updated October 18, 2026
3,713 flights were scheduled from Miami (MIA) to Houston (IAH) in the last 12 months, and 77.7% of those that flew arrived on time, in line with the US average of 77.6%.
Envoy Air was the most punctual of the 5 airlines on the route at 86.9%, while Spirit Airlines trailed at 68.5%.
October has been the best month (83% on time) and Sunday the weakest day of the week (70%).
1.2% of flights were cancelled, versus 1.8% nationally.
MIA to IAH on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Envoy Air | 86.9% | 39 min | 0.0% | 122 |
| United Airlines | 86.2% | 91 min | 0.4% | 1,468 |
| Frontier Airlines | 83.4% | 90 min | 4.0% | 176 |
| American Airlines | 70.7% | 70 min | 1.2% | 1,553 |
| Spirit Airlines | 68.5% | 84 min | 2.9% | 380 |
| Republic Airways | Limited data | 14 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly MIA to IAH
On-time arrival % by scheduled departure hour (local time), 7,368 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 85.0% | 3.2% | 63 |
| 6am–7am | 94.8% | 1.9% | 592 |
| 7am–8am | 89.6% | 0.8% | 386 |
| 8am–9am | 87.8% | 0.7% | 855 |
| 9am–10am | 87.5% | 0.2% | 450 |
| 10am–11am | 80.2% | 1.5% | 133 |
| 11am–12pm | 88.5% | 0.5% | 211 |
| 12pm–1pm | 82.4% | 0.5% | 431 |
| 1pm–2pm | 83.2% | 1.1% | 522 |
| 2pm–3pm | 68.3% | 0.8% | 261 |
| 3pm–4pm | 60.8% | 2.1% | 679 |
| 4pm–5pm | 66.2% | 1.1% | 662 |
| 5pm–6pm | 62.8% | 2.4% | 249 |
| 6pm–7pm | 64.4% | 0.4% | 251 |
| 7pm–8pm | 66.9% | 1.2% | 587 |
| 8pm–9pm | 65.8% | 4.1% | 122 |
| 9pm–10pm | 66.9% | 3.1% | 354 |
| 10pm–11pm | 63.3% | 2.4% | 545 |
| 11pm–12am | Limited data | 15 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on MIA to IAH
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 71.3% | -5.7 pts | 1.3% | 153 |
| Christmas & New Year (Dec 20 - Jan 3) | 78.0% | +1.0 pts | 0.9% | 318 |
| Summer peak (Jun 15 - Aug 15) | 71.7% | -5.3 pts | 2.2% | 1,203 |
| All other days | 77.0% | — | 1.2% | 5,694 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).