Miles between Allentown, PA and Thornton, CO

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

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

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

1,699 mi = 1.61 kms