Historical on-time performance
San Juan to Houston
2,007 miData through May 2026Source: US DOT · BTS
Flights on SJU–IAH arrive on time 88% of the time over the last 12 months.
On-time rate88%arrived within 15 min
p90 delay15 min1 in 10 flights is worse (tail risk)
Cancelled0.7%of scheduled flights
based on 872 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time88%Medianon timep9015 minCancel0.7%Flights872
Why flights run late
Delay causes
- Airline28%
- Weather0%
- Air traffic (NAS)23%
- Late aircraft49%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline33%
- Weather17%
- Air traffic (NAS)50%
- Security0%
Most cancellations here are attributed to Air traffic (NAS). Shares are among 6 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 SJU → IAH
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Early mornings are the most reliable time of day to fly this route — 97% on time.
- Early mornings97% on time · p90 on time · 100 flights · limited
- Mornings92% on time · p90 5 min · 1,048 flights
- Middays86% on time · p90 20 min · 190 flights · limited
- Afternoons73% on time · p90 45 min · 1,314 flights
- Overnights66% on time · p90 85 min · 107 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 78% to 84% on time.
- Tuesdays84% on time · p90 20 min · 345 flights
- Sundays83% on time · p90 30 min · 446 flights
- Wednesdays82% on time · p90 30 min · 354 flights
- Mondays82% on time · p90 25 min · 431 flights
- Thursdays82% on time · p90 30 min · 362 flights
- Fridays81% on time · p90 25 min · 367 flights
- Saturdays78% on time · p90 40 min · 461 flights
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