There are
2,021 mi
from Harlingen, TX to Danbury, CT
That's the driving distance. It would take 1 day 14 hours to go from Harlingen, Texas to Danbury, Connecticut.
The flight distance (direct flight from Harlingen, TX to Danbury, CT) is 1,733.60 mi.
2,021 mi = 3,251.99 kms