Quickest 4h 22min
There are 3 flights1 ferry company operating from SOU to GCI from SOU to GCI. The cheapest ferry costs $111 and is 7h 0min.
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There are 2 ways to travel from SOU to GCI. 3 flights and 1 ferry are possible between the two areas. The ferry operated by Condor Ferries running from Portsmouth to St Peter Port is the cheapestand most convenient. The flight from SOU to ACI is the fastest.
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!