There are 3 train companies operating 5 routes - ES, 9300, LN3, 9300, 272 000. The cheapest train costs $30 and is 3h 59min.
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There are 4 ways to travel from Saint-Ouen to Villeneuve-d'Ascq. 1 train, 4 buses, 1 flight and 1 by car are possible between the two areas. The by car from Saint-Ouen to Villeneuve-d'Ascq is the cheapest. The by car from Saint-Ouen to Villeneuve-d'Ascq is the fastest. The train operated by SNCF running from St-Ouen to Annappes 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!