Historical on-time performance
West Palm Beach to Islip
1,052 miData through Dec 2025Source: US DOT · BTS
Flights on PBI–ISP arrive on time 76% of the time over the last 12 months.
On-time rate76%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled0.4%of scheduled flights
based on 1,122 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- Southwest AirlinesOn-time76%Medianon timep9050 minCancel0.1%Flights730
- JetBlue AirwaysOn-time78%Medianon timep9040 minCancel0.9%Flights330
- Frontier AirlinesOn-time66%Medianon timep9090 minCancel1.6%Flights62
Why flights run late
Delay causes
- Airline17%
- Weather3%
- Air traffic (NAS)11%
- Late aircraft69%
- 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 PBI → 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 — 88% on time.
- Mornings88% on time · p90 15 min · 705 flights
- Middays77% on time · p90 40 min · 1,270 flights
- Afternoons69% on time · p90 55 min · 458 flights
- Overnights64% on time · p90 100 min · 298 flights
- Evenings62% on time · p90 100 min · 305 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 69% to 80% on time.
- Tuesdays80% on time · p90 40 min · 449 flights
- Wednesdays79% on time · p90 35 min · 392 flights
- Mondays77% on time · p90 45 min · 404 flights
- Saturdays77% on time · p90 50 min · 446 flights
- Fridays73% on time · p90 45 min · 417 flights
- Thursdays73% on time · p90 55 min · 452 flights
- Sundays69% on time · p90 75 min · 476 flights
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