The currency used in San Antonio and the rest of Ibiza is the Euro. As this is a popular tourist resort, you’ll find that there are plenty of ATMs and foreign exchange facilities for you to access money when you’re on holiday. Having said that, we would suggest that you buy your currency before you leave the UK in order to get the best rates. You can order and reserve Euros online at ThomasCook.com or get them from your nearest Thomas Cook store.