From the Port of Eivissa in summer season a ferry leaves every 30 minutes to Formentera, you should check the timetables but they leave approximately from 9 am to 8 pm. The prices for a round trip are: tourist, 45 €; resident in the Balearic Islands, 22 €; resident in Formentera, 5 €.
From La Sabina Port
Once at the Sabina Port you should hire a trip to Espalmador. It makes a short stop at Ses Illetes beach to board more passengers. The company in charge of this organizes several round trips every day, prices should be consulted at the port. The price for a round trip per passenger it is 15 €