Enyimba finished top of the log with 12 points from five matches.
Reuben Bala gave Enyimba the lead two minutes before the break.
Joseph Osadiaye dribbled his way into the Akwa United box and squared the ball to Bala who tapped it into the net.
It was Bala’s third goal of the Championship play-offs.
Stanley Dimgba netted Enyimba’s second goal of the game on the hour mark.
The winger nodded home a superb cross from Stanley Okorom.
Abdulrahmam Bashir made the scoreline more emphatic when he scored Enyimba’s third goal with a stunning effort from outside the box a minute before time.