Quickest 4h 22min
There are 3 flights1 ferry company operating from GCI to SOU from GCI to SOU. The cheapest ferry costs $351 and is 7h 30min.
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There are 2 ways to travel from GCI to SOU. 3 flights and 1 ferry are possible between the two areas. The flight from ACI to SOU is the cheapest and fastest. The ferry operated by Condor Ferries running from St Peter Port to Portsmouth 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!