OnTimeStats

Historical on-time performance

San Juan to Houston

2,007 miData through Dec 2025Source: US DOT · BTS

Flights on SJU–IAH arrive on time 86% of the time over the last 12 months.

On-time rate86%arrived within 15 min
p90 delay20 min1 in 10 flights is worse (tail risk)
Cancelled0.7%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-time86%
    Medianon time
    p9020 min
    Cancel0.7%
    Flights873

Why flights run late

Delay causes

  • Airline20%
  • Weather0%
  • Air traffic (NAS)25%
  • Late aircraft55%
  • 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 SJU → IAH

All airlines · rolling 36 months (2023-01 .. 2025-12).

Best time of day

Early mornings are the most reliable time of day to fly this route — 98% on time.

  • Early mornings98% on time · p90 on time · 89 flights · limited
  • Mornings91% on time · p90 10 min · 996 flights
  • Middays87% on time · p90 20 min · 179 flights · limited
  • Afternoons71% on time · p90 50 min · 1,381 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 77% to 82% on time.

  • Sundays82% on time · p90 30 min · 450 flights
  • Mondays81% on time · p90 25 min · 429 flights
  • Tuesdays80% on time · p90 30 min · 345 flights
  • Fridays80% on time · p90 25 min · 362 flights
  • Thursdays79% on time · p90 35 min · 356 flights
  • Wednesdays79% on time · p90 35 min · 356 flights
  • Saturdays77% on time · p90 45 min · 461 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.