The closest international airport to Helsingborg is Copenhagen Airport (Kastrup) in Denmark. It takes about 70 minutes from the airport to Helsingborg Central Station by train. Train tickets can be purchased from the Swedish Skånetrafiken ticket machines or the Danish DSB ticket machines or DSB ticket office in the arrivals hall at Copenhagen Airport. Please note that you need to buy the ticket before you enter the train. Groups of two or more people will get a discount buying the Duo/Family/Together ticket.
The venue "Sea U" is within walking distance (about 10 min) from the train station.