Route on-time record
ISP to FLL: most on-time flights and the best time to fly
Islip (Long Island MacArthur Airport) to Fort Lauderdale (Fort Lauderdale Hollywood International Airport). 375 nonstop flights in Jun 2025 to May 2026, 68% arrived within 15 minutes and 1.9% were cancelled. The most reliable flight number was JetBlue 513 at 8:59 PM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
ISP → FLL
Islip to Fort Lauderdale: 375 nonstop flights a year
On time (12 months)
68%
Cancelled
1.9%
avg delay 26 min
Best time to leave
Noon to 3 PM
75% on time vs 39% 3 to 6 PM
Most reliable airline
JetBlue
69% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · JetBlue 513
8:59 PM → 11:59 PM3h 01m nonstop
Local times, typical schedule. Last flown 2026-05-31.
70%
chance on time
- On time (history)
- 71%
- Cancelled
- 1.5%
- Avg arrival delay
- 25 min
- Arrived on time 71% of the time (327 flights, Jun 2025 to May 2026).
Strong track record · 327 flights
Find JetBlue 513 fares Opens this date on Aviasales#2 · JetBlue 1113
8:25 PM → 11:32 PM3h 07m nonstop
Local times, typical schedule. Last flown 2026-03-30.
65%
chance on time
- On time (history)
- 59%
- Cancelled
- 5.6%
- Avg arrival delay
- 30 min
- Arrived on time 59% of the time (17 flights, Jun 2025 to May 2026).
- 69% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (17 flights), so its score leans on the airline's record at this hour.
Limited track record · 17 flights
Find JetBlue 1113 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- JetBlue69%
353 flights · 70% on time as flown · 1.7% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM66%
33 flights · avg delay 19 min
- 9 AM to noon74%
95 flights · avg delay 11 min
- Noon to 3 PM75%
127 flights · avg delay 25 min
- 3 to 6 PM39%
37 flights · avg delay 35 min
- 6 to 9 PM56%
65 flights · avg delay 51 min
Best day: Tuesday (81%). Worst: Sunday (65%).
Smarter routing
Nearby airports that run more on time
EWR → PBI 75% chance on time
Newark Liberty International Airport to Palm Beach International Airport · 3,583 flights a year · 98 mi from your airports · yours: 67%
EWR → MIA 74% chance on time
Newark Liberty International Airport to Miami International Airport · 3,977 flights a year · 77 mi from your airports · yours: 67%
JFK → MIA 73% chance on time
John F. Kennedy International Airport to Miami International Airport · 4,607 flights a year · 58 mi from your airports · yours: 67%
EWR → FLL 72% chance on time
Newark Liberty International Airport to Fort Lauderdale Hollywood International Airport · 4,762 flights a year · 56 mi from your airports · yours: 67%
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Late-arriving aircraft43%
- Airline (crew, maintenance, boarding)37%
- Air traffic control and airport volume19%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
ISP to FLL questions
- What time of day is best to fly ISP to FLL?
- Noon to 3 PM: 75% of flights arrived on time, against 39% for departures 3 to 6 PM.
- Which airline is most on time from ISP to FLL?
- JetBlue, with a season-adjusted 69% chance of operating and arriving on time over 353 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on ISP to FLL?
- December (61% on time); the best was April (87%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from ISP
- FLL to ISP (return)
- ISP to MCO 72%
- ISP to PBI 71%
- ISP to BWI 84%
- ISP to TPA 71%
Live status: FAA delays and ground stops