Quickest 7h 29min
There are 4 buses1 train company operating 3 routes - Acela Express, Silver Star, Shuttle, and 3 flights from Providence to Ft. Pierce. The cheapest train costs $219 and is 1d 2h 20min.
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There are 4 ways to travel from Providence to Ft. Pierce. 4 buses, 3 trains, 3 flights and 1 by car are possible between the two areas. The by car from Providence to Ft. Pierce is the cheapest. The flight from PVD to MLB is the fastest. The train operated by Amtrak running from PVD to OKE 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!