The venue for Demi Lovato: It's Not That Deep 2026 is Suhai Music Hall, Brazil. From Lisbon it's roughly 7,969 km — plan on about 10h 53m in the air, landing at GRU. For the festival dates, round-trip fares start around $650; they climb fastest in the last 6–8 weeks.
Sample fares Lisbon → GRU. Final prices and dates are on the partner site.