Southwest® flights from Seattle/Tacoma to Harlingen/South Padre Island from $218

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Low fares from Seattle/Tacoma to Harlingen/South Padre Island

$

Seattle/Tacoma (SEA)to

Harlingen/South Padre Island (HRL)
Depart: 09/22/2026

One-way

Basic

From
$218
Seen: 16 hrs ago

Seattle/Tacoma (SEA)to

Harlingen/South Padre Island (HRL)
Depart: 09/15/2026

One-way

Basic

From
$218
Seen: 16 hrs ago

Seattle/Tacoma (SEA)to

Harlingen/South Padre Island (HRL)
Depart: 09/23/2026

One-way

Basic

From
$218
Seen: 16 hrs ago

Seattle/Tacoma (SEA)to

Harlingen/South Padre Island (HRL)
Depart: 09/16/2026

One-way

Basic

From
$218
Seen: 16 hrs ago

Seattle/Tacoma (SEA)to

Harlingen/South Padre Island (HRL)
Depart: 10/09/2026

One-way

Basic

From
$240
Seen: 19 hrs ago

Seattle/Tacoma (SEA)to

Harlingen/South Padre Island (HRL)
Depart: 10/15/2026

One-way

Basic

From
$261
Seen: 26 minutes ago

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Explore flights from Seattle/Tacoma to Harlingen/South Padre Island

Sep 2026
From$218*
Seen: 16 hrs ago
One Way/Basic
Oct 2026
From$240*
Seen: 19 hrs ago
One Way/Basic
Nov 2026
No result for this month.
cmp-daily-histogram-bars-legend-min-price-aria-label $218
cmp-daily-histogram-bars-legend-max-price-aria-label $278
Displaying fares for September-2026
  • SEA–HRL: cmp-view-offers-disclaimer. Find Offers
    14

    Mon

    SEP

  • SEA–HRL, 09/15/2026: From $218
    15

    Tue

  • SEA–HRL, 09/16/2026: From $218
    16

    Wed

  • SEA–HRL, 09/17/2026: From $278
    17

    Thu

  • SEA–HRL, 09/18/2026: From $278
    18

    Fri

  • SEA–HRL: cmp-view-offers-disclaimer. Find Offers
    19

    Sat

  • SEA–HRL, 09/20/2026: From $275
    20

    Sun

  • SEA–HRL, 09/21/2026: From $275
    21

    Mon

  • SEA–HRL, 09/22/2026: From $218
    22

    Tue

  • SEA–HRL, 09/23/2026: From $218
    23

    Wed

  • SEA–HRL, 09/24/2026: From $270
    24

    Thu

  • SEA–HRL, 09/25/2026: From $270
    25

    Fri

  • SEA–HRL: cmp-view-offers-disclaimer. Find Offers
    26

    Sat

  • SEA–HRL, 09/27/2026: From $271
    27

    Sun

  • SEA–HRL: cmp-view-offers-disclaimer. Find Offers
    28

    Mon

  • SEA–HRL: cmp-view-offers-disclaimer. Find Offers
    29

    Tue

  • SEA–HRL: cmp-view-offers-disclaimer. Find Offers
    30

    Wed

  • SEA–HRL: cmp-view-offers-disclaimer. Find Offers
    01

    Thu

    OCT

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    02

    Fri

  • SEA–HRL: cmp-view-offers-disclaimer. Find Offers
    03

    Sat

  • SEA–HRL: cmp-view-offers-disclaimer. Find Offers
    04

    Sun

  • SEA–HRL: cmp-view-offers-disclaimer. Find Offers
    05

    Mon

  • SEA–HRL: cmp-view-offers-disclaimer. Find Offers
    06

    Tue

  • SEA–HRL: cmp-view-offers-disclaimer. Find Offers
    07

    Wed

  • SEA–HRL: cmp-view-offers-disclaimer. Find Offers
    08

    Thu

  • SEA–HRL, 10/09/2026: From $240
    09

    Fri

  • SEA–HRL: cmp-view-offers-disclaimer. Find Offers
    10

    Sat

  • SEA–HRL: cmp-view-offers-disclaimer. Find Offers
    11

    Sun

  • SEA–HRL: cmp-view-offers-disclaimer. Find Offers
    12

    Mon

  • SEA–HRL: cmp-view-offers-disclaimer. Find Offers
    13

    Tue

    • Range$218-$278

    *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:
    Seattle/Tacoma International Airport
    Arriving at:
    Valley International Airport
    Distance:
    1985 miles

    Route Information

    30† 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 30 weekly flights from Seattle/Tacoma to Harlingen/South Padre Island on Southwest Airlines.
    To find the lowest fares by day and time to fly Seattle/Tacoma 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 Seattle/Tacoma 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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