Benicàssim is on the AP-7 coastal motorway and the N-340, with frequent exits to the town. The Renfe suburban line (C-6) links it to Castelló de la Plana in 15 minutes and Valencia in around 90; long-distance trains do not stop here, so for Madrid or Barcelona the easiest option is to connect at Castelló.
The nearest international airport is Valencia (VLC) about 90 minutes south by car or train. Castelló airport (CDT) is closer but has very few scheduled flights. Barcelona-El Prat (BCN) is around three hours by motorway.