There is also a passenger ferry service to Gozo from the capital city of Valletta - https://gozohighspeed.com/pages/fares-and-schedule. This ferry service does not transport cars.
The trip to Cirkewwa from the airport takes around 1 hour and with the bus it takes longer. Then the ferry trip to Gozo from Cirkewwa takes around half an hour. The trip from the airport to Valletta takes half an hour and then the trip on the ferry to Gozo from Valletta takes three-quarters of an hour. Coming back to the airport always leave enough time to cover any traffic you may find in Malta going to the airport.
Both ferries will give you the opportunity to admire the beautiful clear sea of the Mediterranean and who knows you may be lucky enough to catch sight of the dolphins. Each ferry trip gives its own interpretation of the beauty that surrounds the Maltese Islands which changes both with the seasons and also the time of day.
This trip also gives you the chance to pass along the shores of the island of Comino dotted with caves and rock formations that are carved by the pounding waves. Majestically stands the Comino Tower that spouts up from this nearly deserted island.