There are
1,609 mi
from Harlingen, TX to Romulus, MI
That's the driving distance. It would take 1 day 6 hours to go from Harlingen, Texas to Romulus, Michigan.
The flight distance (direct flight from Harlingen, TX to Romulus, MI) is 1,372.25 mi.
1,609 mi = 2,590.22 kms