Historical on-time performance
Miami to Houston
964 miData through May 2026Source: US DOT · BTS
Flights on MIA–IAH arrive on time 75% of the time over the last 12 months.
On-time rate75%arrived within 15 min
p90 delay55 min1 in 10 flights is worse (tail risk)
Cancelled1.2%of scheduled flights
based on 3,457 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time84%Medianon timep9025 minCancel0.7%Flights1,485
- American AirlinesOn-time69%Medianon timep9065 minCancel1.5%Flights1,508
- Spirit AirlinesOn-time68%Medianon timep9095 minCancel2.2%Flights464
Why flights run late
Delay causes
- Airline32%
- Weather5%
- Air traffic (NAS)30%
- Late aircraft33%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline19%
- Weather67%
- Air traffic (NAS)14%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 43 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly MIA → IAH
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 88% on time.
- Mornings88% on time · p90 15 min · 2,990 flights
- Middays79% on time · p90 40 min · 1,859 flights
- Afternoons63% on time · p90 85 min · 2,184 flights
- Evenings61% on time · p90 90 min · 1,862 flights
- Overnights59% on time · p90 85 min · 1,684 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 67% to 76% on time.
- Tuesdays76% on time · p90 45 min · 1,427 flights
- Wednesdays75% on time · p90 50 min · 1,425 flights
- Mondays73% on time · p90 65 min · 1,513 flights
- Fridays72% on time · p90 60 min · 1,557 flights
- Thursdays71% on time · p90 65 min · 1,556 flights
- Saturdays70% on time · p90 70 min · 1,511 flights
- Sundays67% on time · p90 75 min · 1,590 flights
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