There are 1 airline operating 2 routes. The cheapest flight costs $113 and is 16h 10min.
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There are 2 ways to travel from BIQ to SDR. 2 flights and 4 buses are possible between the two areas. The bus from Irun to Santander is the cheapest and fastest. The flight operated by Iberia running from EAS to SDR 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!