There are 1 airline operating 2 routes, 1 bus company operating 4 routes. The cheapest flight costs $113 and is 16h 10min. The cheapest bus costs $18 and is 3h 0min.
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There are 3 ways to travel from EAS to SDR. 2 flights, 4 buses and 1 by car are possible between the two areas. The by car from EAS to SDR is the cheapest and fastest. The bus operated by ALSA running from Estación de Autobuses de San Sebastian to Santander 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!