Southwest® flights from St. Louis to Long Island/Islip MacArthur from $135

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Low fares from St. Louis to Long Island/Islip MacArthur

$

St. Louis (STL)to

Long Island/Islip MacArthur (ISP)
Depart: 10/24/2026

One-way

Basic

From
$135
Seen: 8 hrs ago

St. Louis (STL)to

Long Island/Islip MacArthur (ISP)
Depart: 11/14/2026

One-way

Basic

From
$135
Seen: 14 hrs ago

St. Louis (STL)to

Long Island/Islip MacArthur (ISP)
Depart: 11/12/2026

One-way

Basic

From
$135
Seen: 10 hrs ago

St. Louis (STL)to

Long Island/Islip MacArthur (ISP)
Depart: 10/28/2026

One-way

Basic

From
$135
Seen: 22 hrs ago

St. Louis (STL)to

Long Island/Islip MacArthur (ISP)
Depart: 11/18/2026

One-way

Basic

From
$140
Seen: 19 hrs ago

St. Louis (STL)to

Long Island/Islip MacArthur (ISP)
Depart: 11/13/2026

One-way

Basic

From
$145
Seen: 7 hrs ago

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Explore flights from St. Louis to Long Island/Islip MacArthur

Oct 2026
From$135*
Seen: 8 hrs ago
One Way/Basic
Nov 2026
From$135*
Seen: 10 hrs ago
One Way/Basic
Dec 2026
From$145*
Seen: 19 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $135
cmp-daily-histogram-bars-legend-max-price-aria-label $483
Displaying fares for October-2026
  • STL–ISP: cmp-view-offers-disclaimer. Find Offers
    02

    Fri

    OCT

  • STL–ISP, 10/03/2026: From $483
    03

    Sat

  • STL–ISP, 10/04/2026: From $483
    04

    Sun

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    05

    Mon

  • STL–ISP, 10/06/2026: From $483
    06

    Tue

  • STL–ISP, 10/07/2026: From $355
    07

    Wed

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    08

    Thu

  • STL–ISP, 10/09/2026: From $355
    09

    Fri

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    10

    Sat

  • STL–ISP, 10/11/2026: From $355
    11

    Sun

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    12

    Mon

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    13

    Tue

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    14

    Wed

  • STL–ISP, 10/15/2026: From $221
    15

    Thu

  • STL–ISP, 10/16/2026: From $221
    16

    Fri

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    17

    Sat

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    18

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    19

    Mon

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    20

    Tue

  • STL–ISP: cmp-view-offers-disclaimer. Find Offers
    21

    Wed

  • STL–ISP, 10/22/2026: From $204
    22

    Thu

  • STL–ISP: cmp-view-offers-disclaimer. Find Offers
    23

    Fri

  • STL–ISP, 10/24/2026: From $135
    24

    Sat

  • STL–ISP: cmp-view-offers-disclaimer. Find Offers
    25

    Sun

  • STL–ISP, 10/26/2026: From $214
    26

    Mon

  • STL–ISP: cmp-view-offers-disclaimer. Find Offers
    27

    Tue

  • STL–ISP, 10/28/2026: From $135
    28

    Wed

  • STL–ISP: cmp-view-offers-disclaimer. Find Offers
    29

    Thu

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    30

    Fri

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    31

    Sat

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    01

    Sun

    NOV

    • Range$135-$483

    *Fares displayed have been collected within the last 24 hours and may no longer be available at time of booking. Additional fees and charges for optional products and services may apply. Modifying this information may result in a different fare. To find the most updated fare, please visit Southwest.com. Fares listed are Basic, which are subject to additional terms and conditions.

    Flight Details

    Departing from:
    Lambert-St Louis Int'l Airport
    Arriving at:
    Long Island MacArthur Airport
    Distance:
    929 miles

    Route Information

    78† Weekly flights

    † Weekly flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025. Note: route may not operate every day of the week.

    ‡ Nonstop flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025.

    Questions we hear the most

    There are 78 weekly flights from St. Louis to Long Island/Islip MacArthur on Southwest Airlines.
    To find the lowest fares by day and time to fly St. Louis to Long Island/Islip MacArthur with Southwest, check out our Low Fare Calendar.
    You can rent a car at Long Island MacArthur Airport book yours with your flight.
    Yes! Flights from St. Louis to Long Island/Islip MacArthur—or from here or there to anywhere—can be changed with no change fees. Fare difference may apply.
    Check the status of your upcoming Southwest flight.
    Check out the Southwest Airlines® Help Center for answers about everything Southwest.

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