Peter Turner’s boys dominated the proceedings of the semi-final tie at the APF Stadium in Nepal’s Kathmandu on Friday.
Tanbir Hossain gave the lead as he rose to head a throw-in in the 16th minute.
Foysal Ahmed Fahim extended the lead in the 27th minute when he curled in his shot.
Bangladesh took full control when Maraz Hossain netted in the 32nd minute after a run from the midfield.
Substitute Dipok Roy scored the fourth goal in the added time of the second half.
Bangladesh beat Bhutan in the two previous face-offs in the tournament. In the first edition in 2015, Bangladesh won 2-0 and 3-0 in 2017 when they finished as the runners-up.
Starting with a 3-0 win over Sri Lanka, Bangladesh were held to a goalless draw by India in the second match of the group stage.
In the final on Sunday, Bangladesh will meet India who beat the Maldives 4-0 in the other semi-final.
