It will take you around 2.5 hours to travel from Stuttgart Airport to Konstanz. The German Railways ("Deutsche Bahn" in German) offer very good connections between the two locations. As a very unexpensive travel opportunity, we can recommend two types of discount tickets: "Baden-Württemberger Ticket" for a group or a "BW-Ticket-Single" for one passenger. ICE trains will bring you even quicker to the destination. More information on train schedules and current prices is available under http://www.bahn.de.
Take highway A8 (in German "Autobahn") for around 7 Km to Stuttgart/Karlsruhe. Then switch to A81 in the direction Singen (exit 51/Kreuz Stuttgart). Follow A81 for 130 km and take the exit to Konstanz (exit 40). After 25 Km you will reach Konstanz. Keep your lane in direction of Konstanz City (Zentrum) . Pay attention to the second traffic light to turn into into Rudolf-Diesel-Straße. You will find ISC Konstanz on the left side of the street.
Zürich Airport is very well connected to Konstanz. The journey to Konstanz generally takes between 65 and 90 minutes. Detailed train schedules are available under http://www.sbb.ch/ and http://reiseauskunft.bahn.de.
Take the route in direction Zürich. Go ahead on highway A51 in direction of Zürich for 5 Km. Take highway exit A1/A4 in direction of St.Gallen and keep on driving for 27 Km. Switch to A7 in the direction Konstanz/Kreuzlingen (exit 73) then. In 33 Km take first exit in direction of Kreuzlingen-Nord/Romanshorn. Follow the signs to Kreuzlingen/Konstanz. After crossing the border to Germany cross the Rhine on Schänzle-Bridge and turn left into B33/Reichenaustrasse. In 800 meters, turn left into Rudolf-Diesel Straße. You will find our research institute on the left side of the road.