Route on-time record
PBI to ISP: most on-time flights and the best time to fly
West Palm Beach (Palm Beach International Airport) to Islip (Long Island MacArthur Airport). 1,246 nonstop flights in Jun 2025 to May 2026, 72% arrived within 15 minutes and 1.6% were cancelled. The most reliable flight number was JetBlue 544 at 7:30 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
PBI → ISP
West Palm Beach to Islip: 1,246 nonstop flights a year
On time (12 months)
72%
Cancelled
1.6%
avg delay 19 min
Best time to leave
Before 9 AM
90% on time vs 54% 6 to 9 PM
Most reliable airline
JetBlue
74% 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 544
7:30 AM → 10:09 AM2h 40m nonstop
Local times, typical schedule. Last flown 2026-05-31.
78%
chance on time
- On time (history)
- 79%
- Cancelled
- 0.8%
- Avg arrival delay
- 14 min
- Arrived on time 79% of the time (360 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; 6 to 9 PM: 54%).
- Departs outside PBI's trouble window (11 AM to 5 PM, when 84% of its 31 ground stops and delay programs started).
- 56% of its delay minutes came from the plane arriving late from an earlier flight.
Strong track record · 360 flights
Find JetBlue 544 fares Opens this date on Aviasales#2 · Southwest 1744
10:35 AM → 1:20 PM2h 45m nonstop
Local times, typical schedule. Last flown 2026-04-06.
75%
chance on time
- On time (history)
- 65%
- Cancelled
- 0.0%
- Avg arrival delay
- 17 min
- Arrived on time 65% of the time (20 flights, Jun 2025 to May 2026).
- Departs outside PBI's trouble window (11 AM to 5 PM, when 84% of its 31 ground stops and delay programs started).
- Short track record (20 flights), so its score leans on the airline's record at this hour.
Limited track record · 20 flights
Find Southwest 1744 fares Opens this date on Aviasales#3 · Southwest 1257
12:45 PM → 3:35 PM2h 45m nonstop
Local times, typical schedule. Last flown 2026-05-31.
73%
chance on time
- On time (history)
- 74%
- Cancelled
- 0.0%
- Avg arrival delay
- 16 min
- Arrived on time 74% of the time (54 flights, Jun 2025 to May 2026).
- Never cancelled in 54 scheduled flights.
- Departs inside PBI's trouble window: 84% of its 31 ground stops and delay programs started between 11 AM and 5 PM.
- 50% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 54 flights
Find Southwest 1257 fares Opens this date on Aviasales#4 · Southwest 3928
2:05 PM → 4:45 PM2h 40m nonstop
Local times, typical schedule. Last flown 2026-04-01.
69%
chance on time
- On time (history)
- 63%
- Cancelled
- 0.0%
- Avg arrival delay
- 22 min
- Arrived on time 63% of the time (8 flights, Jun 2025 to May 2026).
- Departs inside PBI's trouble window: 84% of its 31 ground stops and delay programs started between 11 AM and 5 PM.
- 58% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (8 flights), so its score leans on the airline's record at this hour.
Limited track record · 8 flights
Find Southwest 3928 fares Opens this date on Aviasales#5 · JetBlue 444
9:15 PM → 11:58 PM2h 43m nonstop
Local times, typical schedule. Last flown 2026-05-19.
63%
chance on time
- On time (history)
- 60%
- Cancelled
- 2.2%
- Avg arrival delay
- 31 min
- Arrived on time 60% of the time (89 flights, Jun 2025 to May 2026).
- Departs outside PBI's trouble window (11 AM to 5 PM, when 84% of its 31 ground stops and delay programs started).
- 69% of its delay minutes came from the plane arriving late from an earlier flight.
Moderate track record · 89 flights
Find JetBlue 444 fares Opens this date on Aviasales#6 · Southwest 2661
7:35 PM → 10:15 PM2h 40m nonstop
Local times, typical schedule. Last flown 2026-05-31.
59%
chance on time
- On time (history)
- 63%
- Cancelled
- 0.0%
- Avg arrival delay
- 32 min
- Arrived on time 63% of the time (8 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 54% on time; Before 9 AM: 90%).
- Departs outside PBI's trouble window (11 AM to 5 PM, when 84% of its 31 ground stops and delay programs started).
- 80% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 8 flights
Find Southwest 2661 fares Opens this date on Aviasales#7 · Frontier 2448
11:06 AM → 2:04 PM2h 51m nonstop
Local times, typical schedule. Last flown 2026-04-13.
52%
chance on time
- On time (history)
- 43%
- Cancelled
- 2.9%
- Avg arrival delay
- 54 min
- Arrived on time 43% of the time (65 flights, Jun 2025 to May 2026).
- Departs inside PBI's trouble window: 84% of its 31 ground stops and delay programs started between 11 AM and 5 PM.
- 63% of its delay minutes came from the plane arriving late from an earlier flight.
Moderate track record · 65 flights
Find Frontier 2448 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- JetBlue74%
522 flights · 76% on time as flown · 1.8% cancel
- Southwest Airlines71%
640 flights · 72% on time as flown · 1.1% cancel
- Frontier Airlines59%
84 flights · 46% on time as flown · 2.7% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM90%
146 flights · avg delay 5 min
- 9 AM to noon80%
323 flights · avg delay 11 min
- Noon to 3 PM74%
376 flights · avg delay 17 min
- 3 to 6 PM63%
111 flights · avg delay 31 min
- 6 to 9 PM54%
186 flights · avg delay 29 min
- After 9 PM57%
104 flights · avg delay 46 min
Best day: Wednesday (79%). Worst: Sunday (70%).
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 aircraft63%
- Airline (crew, maintenance, boarding)23%
- Air traffic control and airport volume12%
- Severe weather2%
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
PBI to ISP questions
- What time of day is best to fly PBI to ISP?
- Before 9 AM: 90% of flights arrived on time, against 54% for departures 6 to 9 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 PBI to ISP?
- JetBlue, with a season-adjusted 74% chance of operating and arriving on time over 522 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 PBI to ISP?
- July (65% on time); the best was October (90%), 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 PBI
- ISP to PBI (return)
- PBI to ATL 82%
- PBI to EWR 74%
- PBI to LGA 68%
- PBI to JFK 71%
- PBI to BOS 65%
- PBI to CLT 83%
- PBI to DCA 69%
- PBI to HPN 73%
- PBI to PHL 76%
- PBI to ORD 66%
- PBI to BWI 81%
- PBI to DFW 71%
Live status: FAA delays and ground stops