A vessel (1) comprising a hull (2) with a stern (5), bow (7) and bottom (3), an air cavity (6) formed at the bottom (3) of the hull (2) and comprising a cavity top surface (27), a front wall (28) and a front section (10) located nearest to the bow (7), and an air inlet (8) located in the air cavity (6), wherein the vessel comprises a wave deflector (9) defining a lower surface (11) which is situated in the front section (10) of the air cavity (6) and at a distance from the cavity top surface (27) and extends from the front wall (28) substantially in the direction of the stern (5).