Miles between Thornton, CO and Allentown, PA

There are
1,699 mi
from Thornton, CO to Allentown, PA

That's the driving distance. It would take 1 day 6 hours to go from Thornton, Colorado to Allentown, Pennsylvania.

The flight distance (direct flight from Thornton, CO to Allentown, PA) is 1,548.52 mi.

1,699 mi = 1.61 kms