There are
1,725 mi
from Sunnyvale, CA to Seagoville, TX
That's the driving distance. It would take 1 day 6 hours to go from Sunnyvale, California to Seagoville, Texas.
The flight distance (direct flight from Sunnyvale, CA to Seagoville, TX) is 1,474.71 mi.
1,725 mi = 1.61 kms