IAH to MIA flight delays & on-time performance
Nonstop flights from George Bush Intercontinental Airport to Miami International Airport · 964 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at IAH or MIA right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Houston (IAH) to Miami (MIA) arrived on time 78% of the time in Aug 2025 – Jul 2026, in line with the national average.
- 1.1% were cancelled, and 8% arrived an hour or more late.
- United Airlines was the most punctual airline here (82% on time); Spirit Airlines was the least (70%).
- Departures scheduled around 5am did best (92% on time); around 5pm did worst (64%).
- Tuesday was the most reliable day to fly (84% on time) and Sunday the least (71%).
- The largest source of delay minutes was late-arriving aircraft (43%).
Which airline is most on time from IAH to MIA?
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 |
|---|---|---|---|---|---|
| United Airlines | 82% | 0.2% | 12 min | 5.5% | 1,469 |
| Envoy AirRegional airline operating American Eagle flights. | 79% | 0.0% | 12 min | 5.8% | 122 |
| American Airlines | 78% | 1.3% | 25 min | 8.9% | 1,552 |
| Spirit Airlines | 70% | 3.2% | 25 min | 15.5% | 380 |
| Frontier Airlines | 68% | 4.0% | 52 min | 14.3% | 175 |
| Republic AirwaysRegional airline operating flights for American Eagle, Delta Connection and United Express. | 64% | 0.0% | 62 min | 28.6% | 14 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am92%393 flights
- 7am88%702 flights
- 9am81%236 flights
- 10am77%136 flights
- 11am75%225 flights
- 12pm82%356 flights
- 2pm72%229 flights
- 3pm71%80 flights
- 4pm72%237 flights
- 5pm64%208 flights
- 6pm68%626 flights
- 7pm75%113 flights
- 8pm61%96 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday80%1.6% cancelled
- Tuesday84%1.5% cancelled
- Wednesday83%0.8% cancelled
- Thursday79%0.9% cancelled
- Friday79%0.9% cancelled
- Saturday72%0.6% cancelled
- Sunday71%1.6% 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 aircraft43%
- Airline (crew, maintenance, cleaning, fueling)33%
- Air traffic control & airport congestion19%
- Extreme weather6%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather60%
- Airline (crew, maintenance, cleaning, fueling)33%
- Air traffic control & airport congestion7%
- Security0%
IAH to MIA: common questions
- How often are IAH to MIA 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 Houston to Miami cancelled?
- 1.1% of scheduled flights were cancelled (42 of 3,712).
- How long are typical delays?
- Across all flights the average arrival delay was 21 min (early arrivals count as zero). Flights that were late arrived 91 min behind schedule on average, and 8.4% of flights were an hour or more late.
- How long is taxi time at IAH?
- Flights on this route spent 19 min taxiing from the gate to takeoff on average.
Related routes
Return trip: MIA to IAH — 78% on time
More flights from Houston
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: IAH → MIA, nonstop flights by US airlines that report to the DOT. How we calculate this.