Historical on-time performance
Islip to Baltimore
220 miData through May 2026Source: US DOT · BTS
Flights on ISP–BWI arrive on time 83% of the time over the last 12 months.
On-time rate83%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled1.4%of scheduled flights
based on 1,201 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time83%Medianon timep9025 minCancel1.4%Flights1,201
Why flights run late
Delay causes
- Airline23%
- Weather0%
- Air traffic (NAS)33%
- Late aircraft43%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline12%
- Weather59%
- Air traffic (NAS)29%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 17 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly ISP → BWI
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 94% on time.
- Mornings94% on time · p90 5 min · 1,402 flights
- Middays86% on time · p90 20 min · 1,224 flights
- Afternoons73% on time · p90 50 min · 637 flights
- Evenings71% on time · p90 50 min · 561 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 82% to 86% on time.
- Tuesdays86% on time · p90 15 min · 565 flights
- Wednesdays86% on time · p90 20 min · 567 flights
- Saturdays86% on time · p90 25 min · 453 flights
- Thursdays85% on time · p90 25 min · 581 flights
- Mondays84% on time · p90 25 min · 575 flights
- Fridays83% on time · p90 30 min · 583 flights
- Sundays82% on time · p90 30 min · 501 flights
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