Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Shannon to Sorrento as you normally would.
Shannon (SNN) is the airport you will fly out of if you book a flight from Shannon to Sorrento. You should not have trouble finding flights to Sorrento from Shannon; the airport handles an average of 0 outbound flights to Sorrento per day. You should also have plenty of airline options to choose from since 0 airlines have flights from the Shannon airport to Sorrento. It is only a 2.1 mi journey to Shannon (SNN) from Shannon’s city center.