About 560 miles.
3000KMS
215 miles taking this routeFollow U.S. 83 SOUTH from Laredo to SH-100 to SOUTH PADRE ISLAND in the Rio Grande Valley. EXIT.Turn left off the exit ramp onto SH-100 EAST to SOUTH PADRE ISLAND; take SH-100 EAST to South Padre Island.
Check Mapquest.com
The address of the South Padre Island Aquarium is: 106 W Marlin St, South Padre I, TX 78597-6823
Distance: 288.9 miles 464.9 kilometers 251.0 nautical miles
The phone number of the South Padre Island Aquarium is: 956-761-7067.
Driving from Dallas, TX to South Padre Island, TX takes approximately 8 hours 18 minutes depending on the traffic. The distance is 560.3 miles.
Brownsville/South Padre Island airport is the closest airport to South Padre Island. It is serviced by Continental Airlines. Harlingen is just a little farther & is serviced by Continental & Southwest Airlines.
the distance is 633 miles. It takes 4 days to get there.
The shortest driving distance is 680 miles.
It is 1,452 miles according to Google Maps.