Quickest 3h 13min
There are 3 train companies operating 4 routes - ES, 272 000, RER B, D, 3 buses from Boulogne-Billancourt to Lille. The cheapest train costs $33 and is 4h 4min.
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There are 3 ways to travel from Boulogne-Billancourt to Lille. 2 trains, 3 buses and 1 by car are possible between the two areas. The by car from Boulogne-Billancourt to Lille is the cheapest. The train operated by SNCF running from Magenta to Lille-Europe is the fastest. The train operated by running from Port-Royal RER B 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!