Historical on-time performance
Fort Lauderdale to Islip
1,093 miData through May 2026Source: US DOT · BTS
Flights on FLL–ISP arrive on time 70% of the time over the last 12 months.
On-time rate70%arrived within 15 min
p90 delay70 min1 in 10 flights is worse (tail risk)
Cancelled1.9%of scheduled flights
based on 265 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- JetBlue AirwaysOn-time70%Medianon timep9070 minCancel1.9%Flights265
Why flights run late
Delay causes
- Airline37%
- Weather2%
- Air traffic (NAS)10%
- Late aircraft51%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline20%
- Weather40%
- Air traffic (NAS)40%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 5 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 FLL → 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 — 87% on time.
- Mornings87% on time · p90 15 min · 327 flights
- Middays67% on time · p90 70 min · 320 flights
- Evenings62% on time · p90 65 min · 131 flights · limited
- Afternoons58% on time · p90 95 min · 173 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 51% to 79% on time.
- Wednesdays79% on time · p90 45 min · 155 flights · limited
- Tuesdays79% on time · p90 45 min · 124 flights · limited
- Fridays76% on time · p90 50 min · 159 flights · limited
- Saturdays71% on time · p90 55 min · 168 flights · limited
- Thursdays68% on time · p90 80 min · 127 flights · limited
- Mondays65% on time · p90 60 min · 158 flights · limited
- Sundays51% on time · p90 100 min · 136 flights · limited
Keep exploring