There are
2,370 mi
from Petaluma, CA to Romulus, MI
That's the driving distance. It would take 1 day 17 hours to go from Petaluma, California to Romulus, Michigan.
The flight distance (direct flight from Petaluma, CA to Romulus, MI) is 2,069.82 mi.
2,370 mi = 3,814.10 kms