There are 2 train companies operating 6 routes - IC 302, RER B, Ligne Paris-Caen, J, D, K. The cheapest train costs $32 and is 2h 58min.
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There are 4 ways to travel from CDG to LEH. 1 flight, 4 buses, 2 trains and 1 by car are possible between the two areas. The by car from CDG to LEH is the cheapest. The train from Gennevilliers to Deauville is the fastest. The train operated by running from Compans to Deauville 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!