Hull, appearing in their first Super League final, looked the better of the two teams in the opening moments, while Saints looked slightly off the pace.
The East Yorkshire side were still in the contest at this stage, and it didn’t take long for them to equalise when Sid Domic finished off an excellent passage of play.
But they had to head back into the changing rooms at the wrong end of a 10-4 scoreline after Leon Pryce raced thirty metres to edge Saints back in front, Jamie Lyon kicking the first conversion of the game.
And Kieron Cunningham added the final try for Saints – his 150th for the club – converted by Lyon, who will be returning down under with Manly next season.
Wellens, Gardner (T), Lyon (3G), Talau (T), Meli (T), Pryce (T), Long, P. Anderson, Cunningham (T), Cayless, Gilmour, Wilkin, Hooper
Subs Roby, Graham, Bennett, Fa'asavalu.
Briscoe, Tony, Domic (T), Yeaman, Raynor, Cooke, R. Horne, Dowes, Swain, Carvell, McMenemy, Radford, Washbrook
Subs Whiting, G. Horne, Wheeldon, King.