The metro takes you to Lollapalooza in no time, only two stops from Stockholm Central Station. Go with the Red Line towards Ropsten, and get off at Karlaplan. From Karlaplan you take a short walk along Valhallavägen and arrive to the festival in 5 minutes
Buses will run so close to the entrance and adapt their lines accordingly to Lollapalooza.
A bike parking will be available close to the entrance.
The nearest airport is Stockholm Airport (ARN). Upon arrival Train from Arlanda Norra station to Stockholm Centralstation (20 min journey) and then take Subway from T-Centralen T-bana to Gärdet T-bana, 5 min walk from the Venue.