Miles between St Louis, MO and Duncanville, TX

There are
642 mi
from St Louis, MO to Duncanville, TX

That's the driving distance. It would take 12 hours 2 mins to go from St Louis, Missouri to Duncanville, Texas.

The flight distance (direct flight from St Louis, MO to Duncanville, TX) is 558.55 mi.

642 mi = 1,032.47 kms