There are
2,937 mi
from Warwick, RI to Walnut, CA
That's the driving distance. It would take 2 days 4 hours to go from Warwick, Rhode Island to Walnut, California.
The flight distance (direct flight from Warwick, RI to Walnut, CA) is 2,556.87 mi.
2,937 mi = 3.22 kms