There are 1 bus company operating 4 routes. The cheapest bus costs $36 and is 6h 15min.
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There are 2 ways to travel from Castellón de la Plana to Zaragoza. 4 buses and 1 by car are possible between the two areas. The by car from Castellón de la Plana to Zaragoza is the cheapest and fastest. The bus operated by Hife running from Estación de Autobuses de Castellón de la Plana to Estación Central de Autobuses de Zaragoza is the most convenient.
It's important to check each mode when booking your ticket so that you can find the best method for you. The cost of each type varies differently, so be sure to use Faretrotter to keep an eye out!