Islip
ISP · KISPLong Island MacArthur Airport
Passengers a year
1.6M
#113 busiest in the U.S.
18
nonstop destinations
20
airlines
19
departures a day
74.9%
arrivals on time
2.0%
flights cancelled
79.5%
load factor
Airlines
Southwest Airlines is the largest carrier at Islip, with 42% of all passengers. 20 airlines fly from here.
Share of passengers · each carrier as a slice of the whole airport
Southwest Airlines holds 42% of the airport — the 28th most concentrated of 79 small hubs. The nearest comparison is RDM at 43%.
| Airline | Share | Passengers | Seats YoY | ||
|---|---|---|---|---|---|
WN Southwest78% full | 42.2% | 670.8K | 5 | 73.3% | -4.7% |
B6 JetBlue83% full | 23.4% | 371.3K | 5 | 78.9% | +158.4% |
F9 Frontier78% full | 16.8% | 267.2K | 5 | 72.7% | -41.8% |
MX Breeze79% full | 13.1% | 207.4K | 9 | — | +31.1% |
XP Avelo Airlines70% full | 3.9% | 62.4K | 3 | — | — |
+Other airlines | 0.6% | 8.8K | — | — | — |
Share, passengers and destinations count each airline’s own flights plus the regional flying sold under its brand. On-time covers the airline's own aircraft only — regional affiliates report to the government separately. Seats year on year compares the latest twelve months against the twelve before them.
Destinations
18 nonstop destinations from Islip, all domestic.
100% domestic · 0% international · by departing passengers
Top domestic destinations
Southwest Airlines · Frontier Airlines · JetBlue Airways
161.7K161,708 departing · 80% full
Southwest Airlines · JetBlue Airways · Frontier Airlines
Southwest Airlines
Frontier Airlines · Southwest Airlines · JetBlue Airways
49.9K49,914 departing · 84% full
JetBlue Airways · Frontier Airlines
37.8K37,806 departing · 82% full
Breeze Airways · JetBlue Airways
Concord (USA)
20.6K20,638 departing · 80% full
Avelo Airlines
17.8K17,847 departing · 69% full
Frontier Airlines · Breeze Airways
Vero Beach (VRB)
17.2K17,165 departing · 79% full
Breeze Airways
15.6K15,613 departing · 77% full
Breeze Airways · Avelo Airlines
All nonstop destinations
18 nonstop · 6 airlines · 18 domestic / 0 intl
Aircraft
By share of departures at Islip.
Body class · share of departures
- Narrowbody
1,347 departures · 84% full
18.9%
- Narrowbody
1,024 departures · 76% full
14.4%
- Narrowbody
979 departures · 76% full
13.8%
- Narrowbody
938 departures · 78% full
13.2%
- Narrowbody
937 departures · 80% full
13.2%
Cessna C-402
854 departures · 37% full
12.0%
- Narrowbody
575 departures · 82% full
8.1%
- Narrowbody
201 departures · 70% full
2.8%
- Regional
156 departures · 77% full
2.2%
- Narrowbody
69 departures · 74% full
1.0%
When Islip is busiest
Departures by month over the trailing year. Bars scale to the busiest month.
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
May
Departures a month · peak July 2025
Annual passengers since 1990
Total passengers, arriving and departing, in every year on record.
Passengers a year
Every year
- 1990
- 837,985
- 1991
- 856,465
- 1992
- 813,076
- 1993
- 843,790
- 1994
- 930,237
- 1995
- 897,051
- 1996
- 839,556
- 1997
- 737,294
- 1998
- 479,311
- 1999
- 1,515,328
- 2000
- 2,004,835
- 2001
- 1,957,323
- 2002
- 1,956,551
- 2003
- 1,899,787
- 2004
- 1,984,594
- 2005
- 2,122,079
- 2006
- 2,283,441
- 2007
- 2,340,021
- 2008
- 2,094,619
- 2009
- 1,866,262
- 2010
- 1,732,310
- 2011
- 1,586,216
- 2012
- 1,352,327
- 2013
- 1,336,048
- 2014
- 1,306,770
- 2015
- 1,219,964
- 2016
- 1,204,070
- 2017
- 1,309,154
- 2018
- 1,646,041
- 2019
- 1,560,358
- 2020
- 534,392
- 2021
- 1,113,982
- 2022
- 1,239,597
- 2023
- 1,288,350
- 2024
- 1,373,012
- 2025
- 1,594,808
- 2026
- 655,107 so far
Arriving on time
Of every 100 flights landing at Islip, 75 touch down within 15 minutes of schedule, 23 arrive late, and 2 are cancelled.
Every 100 arrivals
16 min
average delay
98
flights cancelled
4.9K
arrivals measured
What holds flights up
Share of delay minutes
Most reliable here
JetBlue Airways 78.9%
Least reliable here
Frontier Airlines 72.7%
Among US airports
#113
On time, month by month
J
A
S
O
N
D
J
F
M
A
M
J
Darker is better · 63.6%–87.7%
The weak spot is March 2026, when 63.6% of arrivals landed on time — 11.3 points below the year. The strongest was September 2025 at 87.7%.
Frequently asked
How busy is Long Island MacArthur Airport (ISP)?
Long Island MacArthur Airport handled about 1.6M passengers over the trailing 12 months, ranking #113 among U.S. airports by passengers, with roughly 19 departures a day.
Which airline is the largest at Long Island MacArthur Airport (ISP)?
Southwest Airlines is the largest carrier at Islip (ISP), flying about 42% of its passengers. 20 airlines serve Islip in total.
How many places can you fly nonstop from Long Island MacArthur Airport (ISP)?
Islip (ISP) has 18 nonstop destinations, all domestic.
How often do flights arrive on time at Long Island MacArthur Airport (ISP)?
About 74.9% of flights arriving at Islip (ISP) touch down within 15 minutes of schedule, per US DOT figures. About 2.0% are cancelled.
What aircraft flies most from Long Island MacArthur Airport (ISP)?
The Airbus A320 flew the largest share of departures from Islip (ISP), about 19% of the total.
Departing counts passengers leaving Islip. Data: traffic June 2025 – May 2026, on-time July 2025 – June 2026. Source: US DOT Bureau of Transportation Statistics (T-100 Segment, On-Time Performance).