MIA to IAH flight delays & on-time performance
Nonstop flights from Miami International Airport to George Bush Intercontinental Airport · 964 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at MIA or IAH right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Miami (MIA) to Houston (IAH) arrived on time 78% of the time in Aug 2025 – Jul 2026, in line with the national average.
- 1.2% were cancelled, and 9% arrived an hour or more late.
- United Airlines was the most punctual airline here (86% on time); Spirit Airlines was the least (68%).
- Departures scheduled around 6am did best (95% on time); around 9pm did worst (63%).
- Wednesday was the most reliable day to fly (83% on time) and Sunday the least (70%).
- The largest source of delay minutes was late-arriving aircraft (34%).
Which airline is most on time from MIA to IAH?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Envoy AirRegional airline operating American Eagle flights. | 87% | 0.0% | 6 min | 3.3% | 122 |
| United Airlines | 86% | 0.4% | 13 min | 5.5% | 1,468 |
| Frontier Airlines | 83% | 4.0% | 15 min | 7.7% | 176 |
| American Airlines | 71% | 1.2% | 22 min | 10.6% | 1,553 |
| Spirit Airlines | 68% | 2.9% | 27 min | 14.9% | 380 |
| Republic AirwaysRegional airline operating flights for American Eagle, Delta Connection and United Express. | 64% | 0.0% | 48 min | 28.6% | 14 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 6am95%325 flights
- 7am88%239 flights
- 8am89%448 flights
- 9am88%174 flights
- 10am85%82 flights
- 11am86%149 flights
- 12pm86%248 flights
- 1pm80%169 flights
- 2pm72%137 flights
- 3pm64%390 flights
- 4pm72%376 flights
- 5pm62%40 flights
- 6pm61%79 flights
- 7pm66%367 flights
- 9pm63%180 flights
- 10pm72%249 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday79%2.0% cancelled
- Tuesday83%1.4% cancelled
- Wednesday83%0.6% cancelled
- Thursday79%1.5% cancelled
- Friday77%0.4% cancelled
- Saturday75%1.1% cancelled
- Sunday70%1.1% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft34%
- Airline (crew, maintenance, cleaning, fueling)32%
- Air traffic control & airport congestion27%
- Extreme weather7%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather58%
- Airline (crew, maintenance, cleaning, fueling)35%
- Air traffic control & airport congestion7%
- Security0%
MIA to IAH: common questions
- How often are MIA to IAH flights on time?
- 78% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Miami to Houston cancelled?
- 1.2% of scheduled flights were cancelled (43 of 3,713).
- How long are typical delays?
- Across all flights the average arrival delay was 18 min (early arrivals count as zero). Flights that were late arrived 78 min behind schedule on average, and 8.7% of flights were an hour or more late.
- How long is taxi time at MIA?
- Flights on this route spent 22 min taxiing from the gate to takeoff on average.
Related routes
Return trip: IAH to MIA — 78% on time
More flights from Miami
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: MIA → IAH, nonstop flights by US airlines that report to the DOT. How we calculate this.