PlainFlights

Route · ISP → PBI · 2020–2025 BTS data

Islip to West Palm Beach/Palm Beach

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), ISP to PBI (Islip to West Palm Beach/Palm Beach) ranks #2638 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

76.2%
On-time
-2.8 pts
vs US avg
74 min
Delay when late
4,604
Flights
#2638 of 4927
Corpus placement

Cancelled

1.1%

Best Month

Nov 2024 93%

Worst Month

Dec 2025 58%

Distance

1,052 mi

Carriers

8

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 133 56 2 0 B6,WN,F9
Nov 2025 100 24 2 0 B6,WN
Oct 2025 93 17 0 2 B6,WN
Sep 2025 86 21 0 0 WN,B6
Aug 2025 88 22 0 1 WN,B6
Jul 2025 94 25 2 3 B6,WN,F9
Jun 2025 103 32 0 0 B6,WN,F9
May 2025 113 26 1 1 B6,WN,F9
Apr 2025 120 19 0 0 F9,WN,B6
Mar 2025 128 23 2 0 B6,WN,F9
Feb 2025 104 30 0 0 B6,WN,F9
Jan 2025 109 35 0 0 B6,WN,F9
Dec 2024 109 45 1 0 B6,F9,WN
Nov 2024 74 5 0 0 B6,WN
Oct 2024 61 9 3 0 WN,B6
Sep 2024 47 7 0 0 WN
Aug 2024 55 21 1 1 F9,WN
Jul 2024 74 14 1 0 F9,WN
Jun 2024 73 8 2 0 F9,WN
May 2024 83 14 0 1 F9,WN
Apr 2024 91 16 2 0 F9,WN
Mar 2024 97 24 3 0 F9,WN
Feb 2024 100 12 2 0 F9,WN
Jan 2024 124 35 1 0 F9,WN

ISP–PBI seasonal on-time pattern

Best: October (81.5%) · weakest: December (68.1%)

65%70%75%80%85% JanFebMarAprMayJunJulAugSepOctNovDec 68.1%

Strongest calendar month

October

81.5% on-time · ~75 flights/mo

Busiest calendar month

January

~101 flights/mo avg

Weakest calendar month

December

68.1% on-time · ~98 flights/mo

Cancellation Rate

1.1%

25 of 2,259 flights

Diversion Rate

0.4%

9 of 2,259 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

ISP - Islip

Full on-time, delay-cause, and seasonal performance for Islip, NY.

ISP on-time profile

PBI - West Palm Beach/Palm Beach

Full on-time, delay-cause, and seasonal performance for West Palm Beach/Palm Beach, FL.

PBI on-time profile

Compare the two airports

See ISP and PBI side by side on delays, cancellations, and reliability.

Compare ISP vs PBI

Origin-hub reliability standing

Mid-pack among ISP departures

From ISP, this corridor sits with 3 other 75–85% on-time routes out of 5 tracked departures, not the hub's reliability leaders (1 at ≥85%) and not the softest ( 1 below 75%). Destination: West Palm Beach/Palm Beach · fleet on-time rank #4272 of 4927.

What the Data Says About ISP to PBI

The Islip to West Palm Beach/Palm Beach corridor (ISP to PBI) posts a 76.2% on-time rate on the lower edge of the average band, based on 4,604 tracked flights. Late flights run 73.5 minutes behind on average. 8 carriers cover the 1,052-mile route; over the last 24 months, 25 of 2,259 flights were cancelled (1.1%) and 0.4% diverted.

The monthly split is wide on this route: Nov 2024 posted the strongest performance at 93% on-time, while Dec 2025 came in at just 58% - a 35-point swing worth factoring into travel timing.

On the multi-year calendar, ISP–PBI peaks in October at 81.5% on-time while January carries the heaviest traffic (~101 flights per month) ; the softest month is December at 68.1%, a 13.4-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does ISP to PBI rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, ISP to PBI ranks #2638 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from ISP to PBI? ▼
Flights from Islip to West Palm Beach/Palm Beach have a 76.2% on-time rate based on 4,604 flights. The average delay is 73.5 minutes. The best recent month was Nov 2024 with 93% on-time.
What is the cancellation rate for ISP to PBI? ▼
Over the last 24 months, 1.1% of flights on this route were cancelled (25 of 2,259 flights) and 0.4% were diverted.
How far is the flight from ISP to PBI? ▼
The flight distance from Islip (ISP) to West Palm Beach/Palm Beach (PBI) is approximately 1,052 miles. This route is served by 8 carriers.
When is the best time to fly from ISP to PBI? ▼
The best recent month for on-time performance was Nov 2024 (93% on-time). The worst was Dec 2025 (58% on-time). Consider booking during months with historically better performance.

Airports on this route

ISP Airport

Islip
PBI Airport

West Palm Beach/Palm Beach
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 ISP–PBI data

ISP–PBI is mid-pack at 76.2% on-time; month and carrier mix move more than the corridor headline.

  • Compare ISP and PBI airport profiles: delay causes and top routes differ even on the same corridor. ISP airport
  • If your dates flex, October (81.5% on-time) beats December (68.1%) on this corridor. Seasonal chart
  • 4 other routes post a similar 76.2% 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.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

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.