OnTimeStats

Historical on-time performance

Baltimore to Islip

220 miData through Dec 2025Source: US DOT · BTS

Flights on BWI–ISP arrive on time 74% of the time over the last 12 months.

On-time rate74%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled1.2%of scheduled flights

based on 1,196 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Southwest Airlines
    On-time74%
    Medianon time
    p9040 min
    Cancel1.2%
    Flights1,196

Why flights run late

Delay causes

  • Airline36%
  • Weather5%
  • Air traffic (NAS)8%
  • Late aircraft51%
  • 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 BWI → ISP

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 — 89% on time.

  • Mornings89% on time · p90 15 min · 440 flights
  • Middays85% on time · p90 20 min · 1,148 flights
  • Afternoons72% on time · p90 40 min · 779 flights
  • Evenings66% on time · p90 55 min · 359 flights
  • Overnights60% on time · p90 60 min · 1,177 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 65% to 79% on time.

  • Tuesdays79% on time · p90 30 min · 582 flights
  • Wednesdays78% on time · p90 30 min · 585 flights
  • Thursdays76% on time · p90 30 min · 590 flights
  • Saturdays73% on time · p90 40 min · 456 flights
  • Mondays72% on time · p90 40 min · 594 flights
  • Fridays72% on time · p90 50 min · 595 flights
  • Sundays65% on time · p90 55 min · 501 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.