Southwest® flights from Long Island/Islip MacArthur to St. Louis from $155

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

$

Long Island/Islip MacArthur (ISP)to

St. Louis (STL)
Depart: 09/09/2026

One-way

Basic

From
$155
Seen: 8 hrs ago

Long Island/Islip MacArthur (ISP)to

St. Louis (STL)
Depart: 08/21/2026

One-way

Basic

From
$159
Seen: 6 hrs ago

Long Island/Islip MacArthur (ISP)to

St. Louis (STL)
Depart: 09/04/2026

One-way

Basic

From
$159
Seen: 20 hrs ago

Long Island/Islip MacArthur (ISP)to

St. Louis (STL)
Depart: 08/23/2026

One-way

Basic

From
$194
Seen: 22 hrs ago

Long Island/Islip MacArthur (ISP)to

St. Louis (STL)
Depart: 08/30/2026

One-way

Basic

From
$194
Seen: 8 hrs ago

Long Island/Islip MacArthur (ISP)to

St. Louis (STL)
Depart: 09/09/2026

One-way

Choice

From
$195
Seen: 8 hrs ago

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

Aug 2026
From$159*
Seen: 6 hrs ago
One Way/Basic
Sep 2026
From$155*
Seen: 8 hrs ago
One Way/Basic
Oct 2026
No result for this month.
cmp-daily-histogram-bars-legend-min-price-aria-label $159
cmp-daily-histogram-bars-legend-max-price-aria-label $473
Displaying fares for August-2026
  • ISP–STL: cmp-view-offers-disclaimer. Find Offers
    02

    Sun

    AUG

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    03

    Mon

  • ISP–STL, 08/04/2026: From $473
    04

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    05

    Wed

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    06

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    07

    Fri

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    08

    Sat

  • ISP–STL, 08/09/2026: From $350
    09

    Sun

  • ISP–STL, 08/10/2026: From $345
    10

    Mon

  • ISP–STL, 08/11/2026: From $345
    11

    Tue

  • ISP–STL, 08/12/2026: From $345
    12

    Wed

  • ISP–STL: cmp-view-offers-disclaimer. Find Offers
    13

    Thu

  • ISP–STL, 08/14/2026: From $345
    14

    Fri

  • ISP–STL, 08/15/2026: From $211
    15

    Sat

  • ISP–STL, 08/16/2026: From $216
    16

    Sun

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    17

    Mon

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    18

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    19

    Wed

  • ISP–STL, 08/20/2026: From $211
    20

    Thu

  • ISP–STL, 08/21/2026: From $159
    21

    Fri

  • ISP–STL: cmp-view-offers-disclaimer. Find Offers
    22

    Sat

  • ISP–STL, 08/23/2026: From $194
    23

    Sun

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    24

    Mon

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

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  • ISP–STL: cmp-view-offers-disclaimer. Find Offers
    26

    Wed

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

    Thu

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    28

    Fri

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

    Sat

  • ISP–STL, 08/30/2026: From $194
    30

    Sun

  • ISP–STL: cmp-view-offers-disclaimer. Find Offers
    31

    Mon

  • ISP–STL: cmp-view-offers-disclaimer. Find Offers
    01

    Tue

    SEP

    • Range$159-$473

    *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:
    Long Island MacArthur Airport
    Arriving at:
    Lambert-St Louis Int'l 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 Long Island/Islip MacArthur to St. Louis on Southwest Airlines.
    To find the lowest fares by day and time to fly Long Island/Islip MacArthur to St. Louis with Southwest, check out our Low Fare Calendar.
    You can rent a car at Lambert-St Louis Int'l Airport book yours with your flight.
    Yes! Flights from Long Island/Islip MacArthur to St. Louis—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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