There are
2,386 mi
from South San Francisco, CA to Romulus, MI
That's the driving distance. It would take 1 day 17 hours to go from South San Francisco, California to Romulus, Michigan.
The flight distance (direct flight from South San Francisco, CA to Romulus, MI) is 2,072.27 mi.
2,386 mi = 3,839.95 kms