Historical on-time performance
Miami to Islip
1,113 miData through Dec 2025Source: US DOT · BTS
Flights on MIA–ISP arrive on time 82% of the time over the last 12 months.
On-time rate82%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled0.0%of scheduled flights
based on 152 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time82%Medianon timep9045 minCancel0.0%Flights152
Why flights run late
Delay causes
- Airline16%
- Weather19%
- Air traffic (NAS)10%
- Late aircraft55%
- 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 MIA → ISP
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 71% to 80% on time.
- Middays80% on time · p90 45 min · 184 flights · limited
- Afternoons71% on time · p90 90 min · 56 flights · limited
Advertisement
Keep exploring