There are
2,988 mi
from Warwick, RI to San Marcos, CA
That's the driving distance. It would take 2 days 5 hours to go from Warwick, Rhode Island to San Marcos, California.
The flight distance (direct flight from Warwick, RI to San Marcos, CA) is 2,547.86 mi.
2,988 mi = 3.22 kms