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Find low faresSouthwest® flights from Harlingen/South Padre Island to Seattle/Tacoma from $170
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1 Passenger
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Low fares from Harlingen/South Padre Island to Seattle/Tacoma
$
Harlingen/South Padre Island (HRL)to
Seattle/Tacoma (SEA)
Depart: 05/05/2026
One-way
Basic
From
$144
Seen: 20 hrs ago
Harlingen/South Padre Island (HRL)to
Seattle/Tacoma (SEA)
Depart: 04/20/2026
One-way
Basic
From
$170
Seen: 15 hrs ago
Harlingen/South Padre Island (HRL)to
Seattle/Tacoma (SEA)
Depart: 05/11/2026
One-way
Basic
From
$170
Seen: 20 hrs ago
Harlingen/South Padre Island (HRL)to
Seattle/Tacoma (SEA)
Depart: 05/05/2026
One-way
Choice
From
$184
Seen: 20 hrs ago
Harlingen/South Padre Island (HRL)to
Seattle/Tacoma (SEA)
Depart: 05/08/2026
One-way
Basic
From
$190
Seen: 9 hrs ago
Harlingen/South Padre Island (HRL)to
Seattle/Tacoma (SEA)
Depart: 03/20/2026
One-way
Basic
From
$205
Seen: 5 hrs ago
Explore flights from Harlingen/South Padre Island to Seattle/Tacoma
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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.