Southwest® flights from Harlingen/South Padre Island to Seattle/Tacoma from $164

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

$

Harlingen/South Padre Island (HRL)to

Seattle/Tacoma (SEA)
Depart: 10/20/2026

One-way

Basic

From
$164
Seen: 59 minutes ago

Harlingen/South Padre Island (HRL)to

Seattle/Tacoma (SEA)
Depart: 09/18/2026

One-way

Basic

From
$185
Seen: 12 hrs ago

Harlingen/South Padre Island (HRL)to

Seattle/Tacoma (SEA)
Depart: 09/19/2026

One-way

Basic

From
$185
Seen: 12 hrs ago

Harlingen/South Padre Island (HRL)to

Seattle/Tacoma (SEA)
Depart: 09/21/2026

One-way

Basic

From
$185
Seen: 10 hrs ago

Harlingen/South Padre Island (HRL)to

Seattle/Tacoma (SEA)
Depart: 10/26/2026

One-way

Basic

From
$195
Seen: 6 hrs ago

Harlingen/South Padre Island (HRL)to

Seattle/Tacoma (SEA)
Depart: 09/11/2026

One-way

Basic

From
$195
Seen: 1 hour ago

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

Aug 2026
From$203*
Seen: 5 hrs ago
One Way/Basic
Sep 2026
From$185*
Seen: 12 hrs ago
One Way/Basic
Oct 2026
From$164*
Seen: 59 minutes ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $185
cmp-daily-histogram-bars-legend-max-price-aria-label $300
Displaying fares for August-2026
  • HRL–SEA, 08/21/2026: From $273
    21

    Fri

    AUG

  • HRL–SEA: cmp-view-offers-disclaimer. Find Offers
    22

    Sat

  • HRL–SEA, 08/23/2026: From $300
    23

    Sun

  • HRL–SEA, 08/24/2026: From $273
    24

    Mon

  • HRL–SEA, 08/25/2026: From $203
    25

    Tue

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    26

    Wed

  • HRL–SEA, 08/27/2026: From $260
    27

    Thu

  • HRL–SEA, 08/28/2026: From $260
    28

    Fri

  • HRL–SEA, 08/29/2026: From $208
    29

    Sat

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    30

    Sun

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    31

    Mon

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

    Tue

    SEP

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    02

    Wed

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    03

    Thu

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    04

    Fri

  • HRL–SEA, 09/05/2026: From $198
    05

    Sat

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    06

    Sun

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    07

    Mon

  • HRL–SEA, 09/08/2026: From $208
    08

    Tue

  • HRL–SEA, 09/09/2026: From $198
    09

    Wed

  • HRL–SEA, 09/10/2026: From $211
    10

    Thu

  • HRL–SEA, 09/11/2026: From $195
    11

    Fri

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    12

    Sat

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    13

    Sun

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    14

    Mon

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    15

    Tue

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    16

    Wed

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    17

    Thu

  • HRL–SEA, 09/18/2026: From $185
    18

    Fri

  • HRL–SEA, 09/19/2026: From $185
    19

    Sat

  • HRL–SEA, 09/20/2026: From $220
    20

    Sun

    • Range$185-$300

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

    Route Information

    35† 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 35 weekly flights from Harlingen/South Padre Island to Seattle/Tacoma on Southwest Airlines.
    To find the lowest fares by day and time to fly Harlingen/South Padre Island to Seattle/Tacoma with Southwest, check out our Low Fare Calendar.
    You can rent a car at Seattle/Tacoma International Airport book yours with your flight.
    Yes! Flights from Harlingen/South Padre Island to Seattle/Tacoma—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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