OnTimeStats

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 Airlines
    On-time81%
    Medianon time
    p9030 min
    Cancel0.3%
    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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Methodology

A flight is on time when it arrives within 15 minutes of schedule — the US DOT / BTS standard. Median and p90(the “1-in-10 bad day”) are read from the full arrival-delay distribution, never averaged across periods.

Figures cover a carrier’s own BTS-coded flights. Cells below ~200 flights are flagged as limited data. All numbers are pre-computed from public BTS On-Time Performance data.