FLL to ISP flight delays
Fort Lauderdale, FL (FLL) Islip, NY (ISP) · 1,092 miles
393 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
74.67%
Arrived on time
Within 15 minutes of schedule
2.04%
Cancelled
Share of scheduled flights
63 min
When late, late by
Average across delayed arrivals
17 min
Delay per flight
Averaged over every flight flown
What the record says about this route
The season swings this route hard. In August it ran 42.3 points more punctual than in March — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
The two directions do not behave alike. ISP to FLL arrives on time 6.1 points less often than the outbound. Delay accumulates through the flying day, so whichever direction is scheduled later tends to carry the worse record — which is an argument for booking the morning departure if the choice exists.
Only JetBlue Airways flies this route in the published record, so there is no choice to weigh — the route's figures and the airline's are the same figures.
This is a thin route — 393 flights across the whole period. On a route this infrequent a cancellation is far more costly than the rate suggests, because the next departure may not be the same day.
Which airline should you fly on this route?
Over January 2025 – August 2026, JetBlue Airways arrived on time most often on FLL to ISP. Flights ran closest to schedule in September and worst in March.
Every airline on FLL to ISP
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| JetBlue Airways | 371 | 76.52% | 1.89% | 60 min | C |
| Frontier Airlines | 19 | 44.44% | 5.26% | 90 min | — |
| Southwest Airlines | 3 | 33.33% | 0% | 19 min | — |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
ISP to FLL Islip back to Fort Lauderdale 68.59% on time DOther routes from Fort Lauderdale
Common questions
Are flights from Fort Lauderdale to Islip usually delayed?
74.67% of flights on the FLL to ISP route arrived within 15 minutes of schedule, so roughly 3 in every ten arrived late. That is about the same as the average route in this record.
Which airlines fly from Fort Lauderdale to Islip?
Only JetBlue Airways appears in the published record on this route, with 371 flights and 76.52% arriving on time.
How often are FLL to ISP flights cancelled?
2.04% of scheduled flights did not operate — about 20 in every thousand. That is in the normal range.
What is the best month to fly Fort Lauderdale to Islip?
August, when 96.8% of flights arrived on time. The worst was March at 54.5%.
When FLL to ISP flights are late, how late are they?
About 63 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on FLL to ISP during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →