ISP to FLL flight delays
Islip, NY (ISP) Fort Lauderdale, FL (FLL) · 1,092 miles
392 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
68.59%
Arrived on time
Within 15 minutes of schedule
1.79%
Cancelled
Share of scheduled flights
77 min
When late, late by
Average across delayed arrivals
25 min
Delay per flight
Averaged over every flight flown
What the record says about this route
The season swings this route hard. In April it ran 35.6 points more punctual than in January — 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. FLL to ISP arrives on time 6.1 points more 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.
Flights from Islip to Fort Lauderdale run late more often than the average route, though not severely.
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.
Which airline should you fly on this route?
Over January 2025 – August 2026, JetBlue Airways arrived on time most often on ISP to FLL. Flights ran closest to schedule in April and worst in January.
Every airline on ISP to FLL
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 | 370 | 70.91% | 1.62% | 81 min | D |
| Frontier Airlines | 19 | 22.22% | 5.26% | 49 min | — |
| Southwest Airlines | 3 | 66.67% | 0% | 17 min | — |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
FLL to ISP Fort Lauderdale back to Islip 74.67% on time DCommon questions
Are flights from Islip to Fort Lauderdale usually delayed?
68.59% of flights on the ISP to FLL route arrived within 15 minutes of schedule, so roughly 3 in every ten arrived late. That is worse than the average route in this record.
Which airlines fly from Islip to Fort Lauderdale?
Only JetBlue Airways appears in the published record on this route, with 370 flights and 70.91% arriving on time.
How often are ISP to FLL flights cancelled?
1.79% of scheduled flights did not operate — about 18 in every thousand. That is in the normal range.
What is the best month to fly Islip to Fort Lauderdale?
April, when 87.1% of flights arrived on time. The worst was January at 51.5%.
When ISP to FLL flights are late, how late are they?
About 77 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 ISP to FLL 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 →