A vented pouring spout for a liquid-storage container, extending between a base and a tip, wherein the base is an area at a rear end of the spout where liquid enters and where air exits during pouring and the tip is an area at a front end of the spout where liquid exits and where air enters, the spout including: a first member including an elongated and generally tubular first main body having at least two longitudinally extending internal passageways, one being an air duct through which an air circuit passes when air enters the container and the other being a liquid duct through which a liquid circuit passes when the liquid flows out of the container, the air duct being generally positioned along a top side of the first main body and being smaller in cross section than that of the liquid duct, the air duct being segregated from the liquid duct along the entire length of the first main body by an intervening wall; a valve having a valve member provided at a front end of the first member; a second member including an elongated second main body inside which the first main body is slidingly axially movable, the second main body having a front section and a rear section, the front section having a front open end defining a valve seat that is engaged by the valve when the spout is in a normally closed position to interrupt the air circuit and the liquid circuit, the valve being out of engagement with the valve seat when the spout is in a fully opened position; and a biasing element positioned between the first member and the second member to urge the spout towards the normally closed position; characterized in that: the air duct includes an end portion having a tapered shape that is located at the base; the liquid duct includes an inlet portion having a tapered shape that is located at the base and that is decreasing in cross section within this tapered inlet portion; the front end of the first member includes a top air inlet opening and a bottom liquid opening, both made through the first main body and separated by a front section of the intervening wall; and the front section of the intervening wall includes a curved bottom side with a radius of curvature configured to redirect the liquid in a substantially radially outward direction as it leaves the liquid duct. a first member including an elongated and generally tubular first main body having at least two longitudinally extending internal passageways, one being an air duct through which an air circuit passes when air enters the container and the other being a liquid duct through which a liquid circuit passes when the liquid flows out of the container, the air duct being generally positioned along a top side of the first main body and being smaller in cross section than that of the liquid duct, the air duct being segregated from the liquid duct along the entire length of the first main body by an intervening wall; a valve having a valve member provided at a front end of the first member; a second member including an elongated second main body inside which the first main body is slidingly axially movable, the second main body having a front section and a rear section, the front section having a front open end defining a valve seat that is engaged by the valve when the spout is in a normally closed position to interrupt the air circuit and the liquid circuit, the valve being out of engagement with the valve seat when the spout is in a fully opened position; and a biasing element positioned between the first member and the second member to urge the spout towards the normally closed position; characterized in that: the air duct includes an end portion having a tapered shape that is located at the base; the liquid duct includes an inlet portion having a tapered shape that is located at the base and that is decreasing in cross section within this tapered inlet portion; the front end of the first member includes a top air inlet opening and a bottom liquid opening, both made through the first main body and separated by a front section of the intervening wall; and the front section of the intervening wall includes a curved bottom side with a radius of curvature configured to redirect the liquid in a substantially radially outward direction as it leaves the liquid duct. the air duct includes an end portion having a tapered shape that is located at the base; the liquid duct includes an inlet portion having a tapered shape that is located at the base and that is decreasing in cross section within this tapered inlet portion; the front end of the first member includes a top air inlet opening and a bottom liquid opening, both made through the first main body and separated by a front section of the intervening wall; and the front section of the intervening wall includes a curved bottom side with a radius of curvature configured to redirect the liquid in a substantially radially outward direction as it leaves the liquid duct.