Southwest® flights from St. Louis to Harlingen/South Padre Island from $119

Promo Code

Low fares from St. Louis to Harlingen/South Padre Island

$

St. Louis (STL)to

Harlingen/South Padre Island (HRL)
Depart: 05/06/2026

One-way

Basic

From
$119
Seen: 6 hrs ago

St. Louis (STL)to

Harlingen/South Padre Island (HRL)
Depart: 05/19/2026

One-way

Basic

From
$119
Seen: 7 hrs ago

St. Louis (STL)to

Harlingen/South Padre Island (HRL)
Depart: 05/10/2026

One-way

Basic

From
$119
Seen: 4 hrs ago

St. Louis (STL)to

Harlingen/South Padre Island (HRL)
Depart: 04/25/2026

One-way

Basic

From
$119
Seen: 3 hrs ago

St. Louis (STL)to

Harlingen/South Padre Island (HRL)
Depart: 04/27/2026

One-way

Basic

From
$119
Seen: 2 hrs ago

St. Louis (STL)to

Harlingen/South Padre Island (HRL)
Depart: 04/01/2026

One-way

Basic

From
$123
Seen: 21 hrs ago

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Explore flights from St. Louis to Harlingen/South Padre Island

Mar 2026
From$123*
Seen: 4 hrs ago
One Way/Basic
Apr 2026
From$119*
Seen: 3 hrs ago
One Way/Basic
May 2026
From$119*
Seen: 7 hrs ago
One Way/Basic
$123
$288
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    • Range$123-$288

    *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:
    Valley International Airport
    Distance:
    961 miles

    Route Information

    95† 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 95 weekly flights from St. Louis to Harlingen/South Padre Island on Southwest Airlines.
    To find the lowest fares by day and time to fly St. Louis to Harlingen/South Padre Island with Southwest, check out our Low Fare Calendar.
    You can rent a car at Valley International Airport book yours with your flight.
    Yes! Flights from St. Louis to Harlingen/South Padre Island—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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