What is the exact distance between venezia(italy) and barcelona(spain) by car.

Hello.

Automaker Opel has a web site that allows you to determine the driving
distance between two points in Europe.
http://www.dealers.globalbuypower.com/index.act?language=en&country=IE

1230 kilometers (764.29 miles) is the distance that you get if you
just enter the names of the two cities.

Your question doesn't specify precise starting and ending points in
each city, but it's possible to enter them if you have such points in
mind.

For example, if you start on Piazzale Roma in Venezia and drive to
Plaça de la Sagrada Família in Barcelona, the exact distance is
1227.11 kilometers (762.49 miles).

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search strategy:
opel route planner

I hope this helps.  If you have any questions, please let me know.  Thanks.