Quickest 3h 4min
There are 1 bus company operating from Castro Urdiales to Gijón from Castro Urdiales to Gijón. The cheapest bus costs $23 and is 5h 4min.
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There are 2 ways to travel from Castro Urdiales to Gijón. 4 buses and 1 by car are possible between the two areas. The by car from Castro Urdiales to Gijón is the cheapest. The by car from Castro Urdiales to Gijón is the fastest. The bus operated by ALSA running from Terminal de Autobuses de Castro-Urdiales to Estación ALSA de Gijón 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!