Historical on-time performance
Houston to San Juan
2,007 miData through Dec 2025Source: US DOT · BTS
Flights on IAH–SJU arrive on time 81% of the time over the last 12 months.
On-time rate81%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled0.3%of scheduled flights
based on 873 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time81%Medianon timep9030 minCancel0.3%Flights873
Why flights run late
Delay causes
- Airline31%
- Weather13%
- Air traffic (NAS)23%
- Late aircraft33%
- Security0%
Most delay minutes here are attributed to Late aircraft.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly IAH → SJU
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 60% to 84% on time.
- Mornings84% on time · p90 25 min · 382 flights
- Overnights83% on time · p90 35 min · 254 flights
- Afternoons80% on time · p90 45 min · 937 flights
- Middays75% on time · p90 40 min · 930 flights
- Evenings60% on time · p90 75 min · 253 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 72% to 82% on time.
- Tuesdays82% on time · p90 35 min · 342 flights
- Fridays82% on time · p90 35 min · 439 flights
- Mondays81% on time · p90 40 min · 362 flights
- Thursdays80% on time · p90 40 min · 361 flights
- Wednesdays75% on time · p90 45 min · 357 flights
- Sundays73% on time · p90 65 min · 430 flights
- Saturdays72% on time · p90 45 min · 465 flights
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