As of the 15^th of August you can travel from Rijeka to Zagreb and from Zagreb to Rijeka for only 60 kn one way, a return ticket cost 110 kn. the offer applies to 5 daily departure in each direction, As the ticket price is so cheap, there is no additional discount either for students, pensioners or for kids. This offer is way cheaper then travelling with train and even if you are 4 persons considering renting a car it are really hard to compete with 240 Kuna for four bus tickets on this route In Rijeka the bus departure from the main bus station, ticket from Rijeka to Zagreb you can find here: Also in Zagreb the bus departures from the main bus station, ticket from Zagreb to Rijeka you can find here: The bus company providing this special offer has not announced any end date of the offer.