Islip
ISP · KISPLong Island MacArthur Airport
Passengers a year
1.6M
#113 busiest in the U.S.
18
nonstop destinations
19
airlines
20
departures a day
75.3%
arrivals on time
1.9%
flights cancelled
80.1%
load factor
Airlines
Southwest Airlines is the largest carrier at Islip, with 41% of all passengers. 19 airlines fly from here.
Share of passengers · each carrier as a slice of the whole airport
Southwest Airlines holds 41% of the airport — the 31st most concentrated of 79 small hubs. The nearest comparison is CAK at 41%.
| Airline | Share | Passengers | Seats YoY | ||
|---|---|---|---|---|---|
WN Southwest80% full | 40.7% | 650.2K | 5 | 74.3% | -11% |
B6 JetBlue83% full | 24.8% | 395.6K | 5 | 77.3% | +107% |
F9 Frontier77% full | 15.7% | 250.5K | 5 | 74.9% | -38.1% |
MX Breeze80% full | 14.3% | 229.2K | 9 | — | +35% |
XP Avelo Airlines74% full | 3.9% | 62.6K | 3 | — | — |
+Other airlines | 0.6% | 9.6K | — | — | — |
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
160.2K160,231 departing · 80% full
Southwest Airlines · JetBlue Airways · Frontier Airlines
Southwest Airlines
Frontier Airlines · Southwest Airlines · JetBlue Airways
53.8K53,756 departing · 84% full
JetBlue Airways · Frontier Airlines
38.9K38,912 departing · 82% full
Breeze Airways · JetBlue Airways
Concord (USA)
23.5K23,475 departing · 79% full
Avelo Airlines
19.6K19,635 departing · 67% full
Frontier Airlines · Breeze Airways
17.8K17,796 departing · 81% full
Breeze Airways
Vero Beach (VRB)
17.3K17,329 departing · 79% full
Breeze Airways
All nonstop destinations
18 nonstop · 6 airlines · 18 domestic / 0 intl
Aircraft
By share of departures at Islip.
Body class · share of departures
- Narrowbody
1,433 departures · 84% full
19.9%
- Narrowbody
1,040 departures · 79% full
14.5%
- Narrowbody
963 departures · 80% full
13.4%
- Narrowbody
944 departures · 77% full
13.1%
Cessna C-402
932 departures · 40% full
13.0%
- Narrowbody
912 departures · 84% full
12.7%
- Narrowbody
502 departures · 81% full
7.0%
- Narrowbody
232 departures · 69% full
3.2%
- Regional
140 departures · 78% full
1.9%
- Narrowbody
66 departures · 75% full
0.9%
When Islip is busiest
Departures by month over the trailing year. Bars scale to the busiest month.
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
May
Jun
Jul
Departures a month · peak July 2026
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
- 938,177 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
95
flights cancelled
4.9K
arrivals measured
What holds flights up
Share of delay minutes
Most reliable here
JetBlue Airways 77.3%
Least reliable here
Southwest Airlines 74.3%
Among US airports
#113
On time, month by month
A
S
O
N
D
J
F
M
A
M
J
J
Darker is better · 63.6%–87.7%
The weak spot is March 2026, when 63.6% of arrivals landed on time — 11.7 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 20 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 41% of its passengers. 19 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 75.3% of flights arriving at Islip (ISP) touch down within 15 minutes of schedule, per US DOT figures. About 1.9% 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 20% of the total.
Departing counts passengers leaving Islip. Data: traffic August 2025 – July 2026, on-time August 2025 – July 2026. Source: US DOT Bureau of Transportation Statistics (T-100 Segment, On-Time Performance).