Southampton overcame West Brom 3-1 on Friday night, advancing to the Championship play-off final.
Last Thursday, the first leg finished in a 0-0 draw at The Hawthorns.
Will Smallbone scored the scoring for the Saints four minutes after the break, as they attempt to make an instant return to the Premier League.
Adam Armstrong scored twice in eight minutes to seal the win for Southampton.
Cedric Kipre, on the other hand, had ample time to deliver a late consolation.
Southampton will now meet Leeds in the final, with both teams aiming to secure the final promotion position following Leicester City and Ipswich Town.
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