The main ticket on this site is not a plain entrance ticket. It is a five-hour coach excursion from Palma that includes cave entry. The caves also sell their own timed tickets, so here is how the choices differ.
The ticket this guide recommends
A coach excursion from a central meeting point in Palma, with fast-track entry, the concert and the boat on Lake Martel included. A guide travels with the group in Spanish, English, German and French, and the stay at the caves runs a little over two hours. Lunch and drinks are not included.
Check Drach caves dates ↗ If you have a hire car
The caves sell timed tickets of their own, online, in their app and at the ticket office, but not by phone. Online tickets cost less than the office's, and the cave advises buying early. Changes and refunds are not accepted, and the concert and the crossing are part of the ticket.
If you stay outside Palma
Another excursion collects guests from resorts in the south of Mallorca, including Arenal, Can Pastilla, Magaluf, Santa Ponsa and Paguera. The pickup may be at a nearby stop, not the hotel door, and the operator emails the stop after booking.
The other cave in Porto Cristo
The Caves of Hams, about a kilometre west of Porto Cristo, are a separate system with their own concert, a light show and a lake called the Sea of Venice. A plain entry ticket is on the third card. It is a different cave, not a way into the Drach caves.