PlainFlights

Route · PBI → ISP · 2020–2025 BTS data

West Palm Beach/Palm Beach to Islip

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), PBI to ISP (West Palm Beach/Palm Beach to Islip) ranks #2640 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
71 min
Delay when late
4,599
Flights
#2640 of 4927
Corpus placement

Cancelled

1.0%

Best Month

Nov 2024 93%

Worst Month

Jun 2025 64%

Distance

1,052 mi

Carriers

8

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 133 45 2 0 B6,WN,F9
Nov 2025 100 20 3 0 B6,WN
Oct 2025 92 8 0 1 B6,WN
Sep 2025 86 10 0 0 WN,B6
Aug 2025 88 22 0 0 WN,B6
Jul 2025 94 33 0 0 B6,WN,F9
Jun 2025 103 37 0 2 B6,WN,F9
May 2025 113 28 1 0 B6,WN,F9
Apr 2025 120 23 0 0 F9,WN,B6
Mar 2025 128 28 1 2 B6,WN,F9
Feb 2025 104 30 0 0 B6,WN,F9
Jan 2025 109 31 0 0 B6,WN,F9
Dec 2024 109 28 0 0 B6,F9,WN
Nov 2024 74 5 0 0 B6,WN
Oct 2024 61 10 2 0 WN,B6
Sep 2024 47 5 0 0 WN
Aug 2024 54 17 1 0 F9,WN
Jul 2024 74 19 3 1 F9,WN
Jun 2024 73 18 1 0 F9,WN
May 2024 83 24 1 0 F9,WN
Apr 2024 91 20 1 1 F9,WN
Mar 2024 97 23 2 0 F9,WN
Feb 2024 100 12 2 0 F9,WN
Jan 2024 123 32 2 1 F9,WN

PBI–ISP seasonal on-time pattern

Best: September (86.5%) · weakest: July (62.8%)

60%70%80%90% JanFebMarAprMayJunJulAugSepOctNovDec 74.4%

Strongest calendar month

September

86.5% on-time · ~54 flights/mo

Busiest calendar month

January

~101 flights/mo avg

Weakest calendar month

July

62.8% on-time · ~67 flights/mo

Cancellation Rate

1.0%

22 of 2,256 flights

Diversion Rate

0.4%

8 of 2,256 flights

Explore origin & destination

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

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

ISP - Islip

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

ISP on-time profile

Compare the two airports

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

Compare PBI vs ISP

Origin-hub reliability standing

Mid-pack among PBI departures

From PBI, this corridor sits with 15 other 75–85% on-time routes out of 20 tracked departures, not the hub's reliability leaders (2 at ≥85%) and not the softest ( 3 below 75%). Destination: Islip · fleet on-time rank #4276 of 4927.

What the Data Says About PBI to ISP

The West Palm Beach/Palm Beach to Islip corridor (PBI to ISP) posts a 76.2% on-time rate on the lower edge of the average band, based on 4,599 tracked flights. Late flights run 71.1 minutes behind on average. 8 carriers cover the 1,052-mile route; over the last 24 months, 22 of 2,256 flights were cancelled (1.0%) and 0.4% diverted.

The monthly split is wide on this route: Nov 2024 posted the strongest performance at 93% on-time, while Jun 2025 came in at just 64% - a 29-point swing worth factoring into travel timing.

On the multi-year calendar, PBI–ISP peaks in September at 86.5% on-time while January carries the heaviest traffic (~101 flights per month) ; the softest month is July at 62.8%, a 23.7-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does PBI to ISP rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, PBI to ISP ranks #2640 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 PBI to ISP? ▼
Flights from West Palm Beach/Palm Beach to Islip have a 76.2% on-time rate based on 4,599 flights. The average delay is 71.1 minutes. The best recent month was Nov 2024 with 93% on-time.
What is the cancellation rate for PBI to ISP? ▼
Over the last 24 months, 1.0% of flights on this route were cancelled (22 of 2,256 flights) and 0.4% were diverted.
How far is the flight from PBI to ISP? ▼
The flight distance from West Palm Beach/Palm Beach (PBI) to Islip (ISP) is approximately 1,052 miles. This route is served by 8 carriers.
When is the best time to fly from PBI to ISP? ▼
The best recent month for on-time performance was Nov 2024 (93% on-time). The worst was Jun 2025 (64% on-time). Consider booking during months with historically better performance.

Airports on this route

PBI Airport

West Palm Beach/Palm Beach
ISP Airport

Islip
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 PBI–ISP data

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

  • Compare PBI and ISP airport profiles: delay causes and top routes differ even on the same corridor. PBI airport
  • If your dates flex, September (86.5% on-time) beats July (62.8%) 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.