Route on-time record
ISP to PBI: most on-time flights and the best time to fly
Islip (Long Island MacArthur Airport) to West Palm Beach (Palm Beach International Airport). 1,247 nonstop flights in Jun 2025 to May 2026, 71% arrived within 15 minutes and 2.1% were cancelled. The most reliable flight number was JetBlue 1245 at 11:00 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
ISP → PBI
Islip to West Palm Beach: 1,247 nonstop flights a year
On time (12 months)
71%
Cancelled
2.1%
avg delay 21 min
Best time to leave
Before 9 AM
84% on time vs 62% 3 to 6 PM
Most reliable airline
Frontier
70% 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 1245
11:00 AM → 1:50 PM2h 50m nonstop
Local times, typical schedule. Last flown 2026-05-20.
78%
chance on time
- On time (history)
- 80%
- Cancelled
- 3.9%
- Avg arrival delay
- 21 min
- Arrived on time 80% of the time (147 flights, Jun 2025 to May 2026).
- Cancelled 3.9% of the time (6 of 154).
- Lands inside PBI's trouble window: 84% of its 31 ground stops and delay programs started between 11 AM and 5 PM.
- 66% of its delay minutes came from the plane arriving late from an earlier flight.
Moderate track record · 147 flights
Find JetBlue 1245 fares Opens this date on Aviasales#2 · Southwest 1156
12:30 PM → 3:20 PM2h 50m nonstop
Local times, typical schedule. Last flown 2026-05-31.
72%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.0%
- Avg arrival delay
- 9 min
- Arrived on time 88% of the time (8 flights, Jun 2025 to May 2026).
- Lands inside PBI's trouble window: 84% of its 31 ground stops and delay programs started between 11 AM and 5 PM.
- Short track record (8 flights), so its score leans on the airline's record at this hour.
Limited track record · 8 flights
Find Southwest 1156 fares Opens this date on Aviasales#3 · Southwest 2499
12:45 PM → 3:35 PM2h 50m nonstop
Local times, typical schedule. Last flown 2026-05-31.
71%
chance on time
- On time (history)
- 76%
- Cancelled
- 0.0%
- Avg arrival delay
- 12 min
- Arrived on time 76% of the time (38 flights, Jun 2025 to May 2026).
- Never cancelled in 38 scheduled flights.
- Lands inside PBI's trouble window: 84% of its 31 ground stops and delay programs started between 11 AM and 5 PM.
- Short track record (38 flights), so its score leans on the airline's record at this hour.
Limited track record · 38 flights
Find Southwest 2499 fares Opens this date on Aviasales#4 · Southwest 3447
7:00 AM → 9:55 AM2h 55m nonstop
Local times, typical schedule. Last flown 2026-04-06.
70%
chance on time
- On time (history)
- 58%
- Cancelled
- 0.0%
- Avg arrival delay
- 18 min
- Arrived on time 58% of the time (33 flights, Jun 2025 to May 2026).
- Never cancelled in 33 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 84% on time; 3 to 6 PM: 62%).
- Short track record (33 flights), so its score leans on the airline's record at this hour.
Limited track record · 33 flights
Find Southwest 3447 fares Opens this date on Aviasales#5 · Frontier 2447
1:07 PM → 4:12 PM3h 06m nonstop
Local times, typical schedule. Last flown 2026-04-13.
69%
chance on time
- On time (history)
- 70%
- Cancelled
- 3.6%
- Avg arrival delay
- 26 min
- Arrived on time 70% of the time (81 flights, Jun 2025 to May 2026).
- Cancelled 3.6% of the time (3 of 84).
- Lands inside PBI's trouble window: 84% of its 31 ground stops and delay programs started between 11 AM and 5 PM.
Moderate track record · 81 flights
Find Frontier 2447 fares Opens this date on Aviasales#6 · JetBlue 545
3:29 PM → 6:22 PM2h 54m nonstop
Local times, typical schedule. Last flown 2026-05-31.
65%
chance on time
- On time (history)
- 67%
- Cancelled
- 1.7%
- Avg arrival delay
- 29 min
- Arrived on time 67% of the time (348 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 62% on time; Before 9 AM: 84%).
Strong track record · 348 flights
Find JetBlue 545 fares Opens this date on Aviasales#7 · Southwest 1266
2:30 PM → 5:20 PM2h 50m nonstop
Local times, typical schedule. Last flown 2026-05-27.
60%
chance on time
- On time (history)
- 63%
- Cancelled
- 0.0%
- Avg arrival delay
- 22 min
- Arrived on time 63% of the time (16 flights, Jun 2025 to May 2026).
- Short track record (16 flights), so its score leans on the airline's record at this hour.
Limited track record · 16 flights
Find Southwest 1266 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Frontier Airlines70%
84 flights · 70% on time as flown · 2.6% cancel
- Southwest Airlines69%
641 flights · 71% on time as flown · 1.7% cancel
- JetBlue69%
522 flights · 71% on time as flown · 2.4% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM84%
306 flights · avg delay 12 min
- 9 AM to noon82%
150 flights · avg delay 16 min
- Noon to 3 PM62%
339 flights · avg delay 21 min
- 3 to 6 PM62%
406 flights · avg delay 31 min
- 6 to 9 PM83%
41 flights · avg delay 13 min
Best day: Tuesday (77%). Worst: Sunday (70%).
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 · 56 mi from your airports · yours: 69%
EWR → FLL 72% chance on time
Newark Liberty International Airport to Fort Lauderdale Hollywood International Airport · 4,762 flights a year · 98 mi from your airports · yours: 69%
HPN → FLL 72% chance on time
Westchester County Airport to Fort Lauderdale Hollywood International Airport · 883 flights a year · 79 mi from your airports · yours: 69%
HPN → PBI 72% chance on time
Westchester County Airport to Palm Beach International Airport · 1,638 flights a year · 37 mi from your airports · yours: 69%
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 aircraft42%
- Airline (crew, maintenance, boarding)27%
- Air traffic control and airport volume27%
- Severe weather4%
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 PBI questions
- What time of day is best to fly ISP to PBI?
- Before 9 AM: 84% of flights arrived on time, against 62% for departures 3 to 6 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from ISP to PBI?
- Frontier, with a season-adjusted 70% chance of operating and arriving on time over 84 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 PBI?
- December (63% on time); the best was November (85%), 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
- PBI to ISP (return)
- ISP to MCO 72%
- ISP to BWI 84%
- ISP to TPA 71%
- ISP to FLL 68%
Live status: FAA delays and ground stops