Seen the short distance between Porto Alegre and Rosario, you could also choose to travel by train or carpooling. Spending little more money, your journey would become more comfortable.
For such long distances, travelling by bus could not be the best solution. Check out alternatives by plane: with some luck, you will find low-cost tickets from Porto Alegre to Rosario and be a lot faster!
When are the buses of the line Porto Alegre - Rosario scheduled?
The first bus leaves from Porto Alegre at 00:01, while the last one leaves at 00:01. The journey takes 17 hours and 50 minutess.
Which bus companies are in service in the route Porto Alegre - Rosario?
There are many companies cooperating with virail, among which also Flecha Bus with buses to Rosario.