Google Earth states the distance is 542 miles - and would take 9 hours 36 minutes to drive it.
505 km
About 4 hours if traffic cooperates
It is 240 miles according to Google Maps.
About 12000 miles
450 miles
514 miles
Austin area
About 110 miles.
About 508 miles.
The driving distance from Dallas, Texas to Dumas, Texas is 408 miles.
The driving distance from Austin, Texas to Fort Lauderdale, Florida is 1,330 miles.
It is 388.71 miles according to MapQuest.