The are 6 different ways across 3 unique modes of transportation to help you travel from Jaú to Maringá. If you're only considering the price, you should check out the bus out of Jaú towards Maringá, as it is the cheapest to Maringá. It's common to find tickets for as low as $35. Viação Garcia operates from Jaú to Maringá, so you book your trip with them! Book as soon as you can, as there may be limited availability.
On your trip from Jaú to Maringá, it is best to book as soon as possible. It won't necessarily help reduce your price by a large amount, but will ensure that you have a spot on the bus or train.