There are 1 train company operating 2 routes - TER 23, LN3. The cheapest train costs $60 and is 4h 13min.
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There are 3 ways to travel from Saint-Quentin-en-Yvelines to Lille. 1 train, 3 buses and 1 by car are possible between the two areas. The by car from Saint-Quentin-en-Yvelines to Lille is the cheapest and fastest. The train operated by running from La Verrière to Lille 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!