Quickest 2h 47min
There are 2 train companies operating 4 routes - IC A, 9300, L.50A, 9200, 2 buses from OST to AMS. The cheapest train costs $45 and is 5h 50min.
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There are 3 ways to travel from OST to AMS. 2 trains, 2 buses and 1 by car are possible between the two areas. The by car from OST to AMS is the cheapest. The by car from OST to AMS is the fastest. The train operated by running from Oostende to Schiphol Airport 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!