Southwest® flights from Harlingen/South Padre Island to Seattle/Tacoma from $185

Promo Code

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

$

Harlingen/South Padre Island (HRL)to

Seattle/Tacoma (SEA)
Depart: 10/21/2026

One-way

Basic

From
$185
Seen: 23 hrs ago

Harlingen/South Padre Island (HRL)to

Seattle/Tacoma (SEA)
Depart: 10/22/2026

One-way

Basic

From
$190
Seen: 9 hrs ago

Harlingen/South Padre Island (HRL)to

Seattle/Tacoma (SEA)
Depart: 11/13/2026

One-way

Basic

From
$215
Seen: 10 hrs ago

Harlingen/South Padre Island (HRL)to

Seattle/Tacoma (SEA)
Depart: 11/24/2026

One-way

Basic

From
$215
Seen: 5 hrs ago

Harlingen/South Padre Island (HRL)to

Seattle/Tacoma (SEA)
Depart: 10/03/2026

One-way

Basic

From
$218
Seen: 5 hrs ago

Harlingen/South Padre Island (HRL)to

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

One-way

Basic

From
$218
Seen: 5 hrs ago

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

Oct 2026
From$185*
Seen: 23 hrs ago
One Way/Basic
Nov 2026
From$215*
Seen: 5 hrs ago
One Way/Basic
Dec 2026
From$225*
Seen: 13 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $185
cmp-daily-histogram-bars-legend-max-price-aria-label $310
Displaying fares for October-2026
  • HRL–SEA, 10/01/2026: From $283
    01

    Thu

    OCT

  • HRL–SEA: cmp-view-offers-disclaimer. Find Offers
    02

    Fri

  • HRL–SEA, 10/03/2026: From $218
    03

    Sat

  • HRL–SEA, 10/04/2026: From $283
    04

    Sun

  • HRL–SEA, 10/05/2026: From $278
    05

    Mon

  • HRL–SEA, 10/06/2026: From $218
    06

    Tue

  • HRL–SEA, 10/07/2026: From $245
    07

    Wed

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    08

    Thu

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    09

    Fri

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    10

    Sat

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    11

    Sun

  • HRL–SEA, 10/12/2026: From $310
    12

    Mon

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    13

    Tue

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    14

    Wed

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    15

    Thu

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    16

    Fri

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    17

    Sat

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    18

    Sun

  • HRL–SEA, 10/19/2026: From $225
    19

    Mon

  • HRL–SEA, 10/20/2026: From $218
    20

    Tue

  • HRL–SEA, 10/21/2026: From $185
    21

    Wed

  • HRL–SEA, 10/22/2026: From $190
    22

    Thu

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    23

    Fri

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    24

    Sat

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    25

    Sun

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    26

    Mon

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    27

    Tue

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    28

    Wed

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    29

    Thu

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    30

    Fri

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    31

    Sat

    • Range$185-$310

    *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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