OnTimeStats

Historical on-time performance

Atlanta to San Juan

1,547 miData through Dec 2025Source: US DOT · BTS

Flights on ATL–SJU arrive on time 72% of the time over the last 12 months.

On-time rate72%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled0.9%of scheduled flights

based on 1,879 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

Too close to call — no single carrier is clearly more on-time here.

  • Delta Air Lines
    On-time73%
    Medianon time
    p9045 min
    Cancel0.8%
    Flights1,651
  • Spirit Airlines
    On-time80%
    Medianon time
    p9025 min
    Cancel0.0%
    Flights123
  • Frontier Airlines
    On-time52%
    Median5 min
    p90105 min
    Cancel3.8%
    Flights105

Why flights run late

Delay causes

  • Airline46%
  • Weather8%
  • Air traffic (NAS)25%
  • Late aircraft21%
  • Security0%

Most delay minutes here are attributed to Airline.

Over time

On-time trend

By season

On-time rate by month

When to fly

Best time to fly ATL → SJU

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

Best time of day

Mornings are the most reliable time of day to fly this route — 83% on time.

  • Mornings83% on time · p90 25 min · 1,915 flights
  • Middays78% on time · p90 35 min · 2,177 flights
  • Afternoons69% on time · p90 65 min · 651 flights
  • Evenings66% on time · p90 70 min · 1,180 flights
  • Overnights43% on time · p90 130 min · 247 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 69% to 80% on time.

  • Wednesdays80% on time · p90 40 min · 819 flights
  • Tuesdays80% on time · p90 35 min · 796 flights
  • Thursdays76% on time · p90 40 min · 897 flights
  • Mondays75% on time · p90 50 min · 905 flights
  • Fridays74% on time · p90 45 min · 923 flights
  • Sundays71% on time · p90 55 min · 909 flights
  • Saturdays69% on time · p90 55 min · 921 flights
Advertisement

Keep exploring

Related pages

Delay predictorfor this route→ATL airportAtlanta→SJU airportSan Juan→AirTran Airways on this routecarrier detail→AirTran Airwaysairline profile→

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.