Historical on-time performance
Houston to San Juan
2,007 miData through May 2026Source: 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)
Cancelled0.5%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-time81%Medianon timep9030 minCancel0.5%Flights872
Why flights run late
Delay causes
- Airline32%
- Weather11%
- Air traffic (NAS)23%
- Late aircraft35%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline0%
- Weather50%
- Air traffic (NAS)50%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 4 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 IAH → SJU
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 56% to 84% on time.
- Mornings84% on time · p90 25 min · 291 flights
- Overnights84% on time · p90 35 min · 303 flights
- Afternoons81% on time · p90 40 min · 988 flights
- Middays76% on time · p90 40 min · 1,006 flights
- Evenings56% on time · p90 75 min · 175 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 71% to 84% on time.
- Tuesdays84% on time · p90 30 min · 341 flights
- Mondays82% on time · p90 35 min · 361 flights
- Fridays82% on time · p90 30 min · 438 flights
- Thursdays81% on time · p90 45 min · 366 flights
- Wednesdays78% on time · p90 40 min · 356 flights
- Sundays74% on time · p90 60 min · 436 flights
- Saturdays71% on time · p90 45 min · 465 flights
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