Southwest® flights from Harlingen/South Padre Island to Seattle/Tacoma from $135

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

$

Harlingen/South Padre Island (HRL)to

Seattle/Tacoma (SEA)
Depart: 04/14/2026

One-way

Basic

From
$135
Seen: 18 hrs ago

Harlingen/South Padre Island (HRL)to

Seattle/Tacoma (SEA)
Depart: 03/24/2026

One-way

Basic

From
$135
Seen: 5 hrs ago

Harlingen/South Padre Island (HRL)to

Seattle/Tacoma (SEA)
Depart: 05/13/2026

One-way

Basic

From
$135
Seen: 22 hrs ago

Harlingen/South Padre Island (HRL)to

Seattle/Tacoma (SEA)
Depart: 03/28/2026

One-way

Basic

From
$153
Seen: 2 hrs ago

Harlingen/South Padre Island (HRL)to

Seattle/Tacoma (SEA)
Depart: 03/30/2026

One-way

Basic

From
$170
Seen: 14 hrs ago

Harlingen/South Padre Island (HRL)to

Seattle/Tacoma (SEA)
Depart: 05/27/2026

One-way

Basic

From
$170
Seen: 22 hrs ago

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

*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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