The discount for adult return tickets is 10% when the ticket distance is at least 60 km. Children's return tickets are half of the normal rate. Unused return tickets cannot be refunded. Return tickets are valid only on Savonlinja departures. Before buying a ticket from the driver, make sure that your return ticket is operated by the same company.
The discounts mentioned will be granted by the driver for the purchased tickets. Tickets purchased online may be even cheaper.