By car:
Your will reach Oberdischingen and Bareiss comfortably via the motorway A7 from
direction of Würzburg or Kempten and via the motorway A8 from the direction of Stuttgart or Munich.
Then along the B311 in the direction of Sigmaringen.

Use map service of Google Map. You can zoom the map and you can print out a plan of the route.

By plane:
airport Stuttgart - then via Ulm in direction of Ehingen
airport Friedrichshafen - then via Ravensburg/Biberach/Ehingen