Route · FLL → ISP · 2020–2025 BTS data
Fort Lauderdale to Islip
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), FLL to ISP (Fort Lauderdale to Islip) ranks #4345 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 74.4%
- On-time
- -4.6 pts
- vs US avg
- 71 min
- Delay when late
- 1,202
- Flights
- #4345 of 4927
- Corpus placement
Cancelled
2.8%
Best Month
May 2025 81%
Worst Month
Mar 2022 45%
Distance
1,092 mi
Carriers
8
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 46 | 17 | 1 | 0 | F9,B6 |
| Nov 2025 | 33 | 10 | 0 | 0 | B6 |
| Aug 2025 | 31 | 1 | 0 | 0 | B6 |
| Jul 2025 | 31 | 5 | 0 | 0 | B6 |
| May 2025 | 52 | 10 | 0 | 0 | B6,F9 |
| Apr 2025 | 47 | 5 | 0 | 0 | F9,B6 |
| Mar 2025 | 35 | 7 | 1 | 1 | B6,WN,F9 |
| Feb 2025 | 35 | 6 | 0 | 0 | B6,WN,F9 |
| Dec 2024 | 32 | 4 | 2 | 0 | B6,F9 |
| Aug 2024 | 36 | 17 | 3 | 0 | F9 |
| Jul 2024 | 31 | 13 | 1 | 0 | F9 |
| Jun 2024 | 30 | 9 | 1 | 0 | F9 |
| May 2024 | 31 | 6 | 1 | 0 | F9 |
| Apr 2024 | 30 | 3 | 1 | 1 | F9 |
| Mar 2024 | 33 | 14 | 0 | 1 | F9,WN |
| Feb 2024 | 30 | 8 | 0 | 0 | F9,WN |
| Dec 2023 | 38 | 18 | 3 | 0 | F9,WN |
| Aug 2023 | 31 | 15 | 0 | 0 | F9 |
| Jul 2023 | 31 | 15 | 0 | 0 | F9 |
| Jun 2023 | 30 | 9 | 2 | 0 | F9 |
| May 2022 | 31 | 4 | 1 | 0 | F9 |
| Mar 2022 | 60 | 33 | 2 | 0 | F9,WN |
| Feb 2022 | 40 | 13 | 0 | 0 | F9,WN |
| Jan 2022 | 31 | 5 | 5 | 0 | WN |
FLL–ISP seasonal on-time pattern
Best: April (90.0%) · weakest: July (64.5%)
Strongest calendar month
April
90.0% on-time · ~35 flights/mo
Busiest calendar month
January
~49 flights/mo avg
Weakest calendar month
July
64.5% on-time · ~31 flights/mo
Cancellation Rate
2.8%
24 of 855 flights
Diversion Rate
0.4%
3 of 855 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
FLL - Fort Lauderdale
Full on-time, delay-cause, and seasonal performance for Fort Lauderdale, FL.
FLL on-time profileISP - Islip
Full on-time, delay-cause, and seasonal performance for Islip, NY.
ISP on-time profileCompare the two airports
See FLL and ISP side by side on delays, cancellations, and reliability.
Compare FLL vs ISPOrigin-hub reliability standing
Softer reliability from FLL
Among 62 routes leaving FLL, only 29 (including this one) clear below 75% on-time, while 1 stay ≥85% and 32 sit mid-band. Travelers comparing FLL options should weigh this 74.4% print against those peers · fleet on-time rank #4557 of 4927.
Similar routes
Other BTS-tracked routes with comparable performance or trip length to FLL–ISP.
Routes with a similar on-time rate
What the Data Says About FLL to ISP
On-time performance on the FLL to ISP pairing (Fort Lauderdale to Islip) trails a chunk of the network: 74.4% of 1,202 tracked flights arrived on schedule, with a 71.0-minute average delay on the ones that ran late. The route spans about 1,092 miles across 8 carriers. Cancellations over the trailing 24 months hit 2.8% (24 of 855 flights), with 0.4% diverted.
The monthly split is wide on this route: May 2025 posted the strongest performance at 81% on-time, while Mar 2022 came in at just 45% - a 36-point swing worth factoring into travel timing.
On the multi-year calendar, FLL–ISP peaks in April at 90.0% on-time while January carries the heaviest traffic (~49 flights per month) ; the softest month is July at 64.5%, a 25.5-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does FLL to ISP rank among US routes by traffic? ▼
How often are flights delayed from FLL to ISP? ▼
What is the cancellation rate for FLL to ISP? ▼
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Airports on this route
Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Using FLL–ISP data
FLL–ISP sits 4.6 pts below the national 79% average; check the seasonal chart and airport profiles before treating the headline as typical.
- Compare FLL and ISP airport profiles: delay causes and top routes differ even on the same corridor. FLL airport
- If your dates flex, April (90.0% on-time) beats July (64.5%) on this corridor. Seasonal chart
- 4 other routes post a similar 74.4% on-time rate; compare before you commit to this pairing. Similar routes
On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.