Historical on-time performance
Baltimore to Islip
220 miData through May 2026Source: 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)
Cancelled1.9%of scheduled flights
based on 1,203 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 minCancel1.9%Flights1,203
Why flights run late
Delay causes
- Airline43%
- Weather3%
- Air traffic (NAS)6%
- Late aircraft48%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline22%
- Weather61%
- Air traffic (NAS)17%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 23 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 BWI → ISP
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 — 89% on time.
- Mornings89% on time · p90 15 min · 379 flights
- Middays84% on time · p90 20 min · 1,117 flights
- Afternoons73% on time · p90 40 min · 812 flights
- Evenings65% on time · p90 70 min · 345 flights
- Overnights61% on time · p90 60 min · 1,175 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 64% to 79% on time.
- Tuesdays79% on time · p90 30 min · 565 flights
- Wednesdays77% on time · p90 35 min · 568 flights
- Saturdays76% on time · p90 35 min · 454 flights
- Thursdays75% on time · p90 35 min · 580 flights
- Fridays72% on time · p90 50 min · 584 flights
- Mondays72% on time · p90 50 min · 577 flights
- Sundays64% on time · p90 55 min · 500 flights
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