Do you mean San Antoni?
I have not yet visited Ibiza but from the bus website
it seems that the airport> San Antoni bus service (route 9) only runs during the summer months. But you could take the bus from the airport to Eivissa (route 10) and then a bus to San Antoni from Eivissa (route 3 or 8). All those routes give details of the 'winter' timetable (i.e. April) as well as the summer one.
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