There are
1,546 mi
from Oceanside, CA to Galveston, TX
That's the driving distance. It would take 1 day 2 hours to go from Oceanside, California to Galveston, Texas.
The flight distance (direct flight from Oceanside, CA to Galveston, TX) is 1,357.91 mi.
1,546 mi = 1.61 kms