Quickest 7h 24min
There are 4 buses 3 flights1 train company operating 3 routes - Capitol Limited, Silver Star, Cardinal from De Kalb to Port St. Lucie. The cheapest train costs $269 and is 1d 8h 51min.
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There are 4 ways to travel from De Kalb to Port St. Lucie. 4 buses, 3 flights, 3 trains and 1 by car are possible between the two areas. The by car from De Kalb to Port St. Lucie is the cheapest. The flight from ORD to MLB is the fastest. The train operated by Amtrak running from CHI 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!