There are
2,605 mi
from Rockville, MD to Temecula, CA
That's the driving distance. It would take 1 day 22 hours to go from Rockville, Maryland to Temecula, California.
The flight distance (direct flight from Rockville, MD to Temecula, CA) is 2,242.28 mi.
2,605 mi = 4,192.33 kms