Acciona Trasmediterranea operates a car ferry from Gandia to Ibiza Airport (IBZ) once daily. Tickets cost $45 - $90 and the journey takes 2 h.
How to get from Gandia to Ibiza Airport (IBZ)
From Valencia - Gandia car ferry to Ibiza - Sant Antoni de Portmany then taxi to Ibiza Airport (IBZ). 2 h 21 min 98€. From Gandia train to Xativa, line 5 subway to Valencia airport, then fly to Ibiza airport. 3 h 7 min 37€.