Miles between St Louis, MO and Waterloo, IA

There are
338 mi
from St Louis, MO to Waterloo, IA

That's the driving distance. It would take 6 hours 39 mins to go from St Louis, Missouri to Waterloo, Iowa.

The flight distance (direct flight from St Louis, MO to Waterloo, IA) is 289.81 mi.

338 mi = 543.75 kms