Benchmarked strictly across TripTiming's 5 empirical pillars: Crowds, Weather, Vibes, Prices, and Safety.
While Ibiza captures an advantage on pure Weather (97 vs 96) with 29°C ambient temperatures, Mallorca decisively captures September on Crowds (56 vs 53) and Prices (60 vs 58). Ibiza suffers from seasonal congestion and peak lodging premiums ($406/night), whereas Mallorca delivers a more balanced, friction-free itinerary with approximately $588 in lodging savings on a 7-night stay ($322/night vs $406/night).