The summer months from the end of May to the beginning of October are the peak months, the stars spend a lot of time, parties on the island all night. This is also the season for water activities such as windsurfing, flyboarding, slingshots, … and is the peak when restaurants operate at full capacity to welcome guests.
From May to October is also an occasion for cultural activities, such as traditional folk dance, festivals and sports activities such as walking or boating, climbing, .. Winter months are more deserted, though it will be quieter, but I do not recommend you to come this season, because Ibiza is the vibrant beach and party!
Air travel is the simplest way to get to Ibiza. There are many direct flights from many major cities in Europe to Ibiza because the island is famous as well as a convenient location. You can fly from Paris, Lisbon, Rome, … to Ibiza.
During my trip I flew to Ibiza from Lisbon using TAP Air Portugal, and left Ibiza for Naples with Vueling. A friend in the group flew back to Ibiza from Paris. Due to being the island of Spain, Vueling seems to have the most flights to Ibiza, when looking for tickets, you should go to this company first.
If you come from some coastal cities in Spain such as Barcelona or Valencia, you can choose the option to take a ferry. You can also consider going back and forth between Ibiza and another beautiful island of Spain Mallorca. See the Mallorca experience here.
Ferry time from Barcelona is about 7-9h, and from Valencia it is closer so the time is shorter. There are two main ferry companies for Ibiza trips that cover each airline for about 6 or 7 flights for week.