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 AirlinesOn-time74%Medianon timep9040 minCancel1.2%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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