Quickest 7h 34min
There are 3 buses1 train company operating 4 routes - City Of New Orleans, Cardinal, Crescent, Sunset Limited, and 3 flights from Philadelphia to Baton Rouge. The cheapest train costs $218 and is 1d 2h 5min.
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There are 4 ways to travel from Philadelphia to Baton Rouge. 3 buses, 4 trains, 3 flights and 1 by car are possible between the two areas. The by car from Philadelphia to Baton Rouge is the cheapest. The flight from PHL to BTR is the fastest. The train operated by Amtrak running from PHL to NIB 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!