Both teams were relegated from the Premier League last season, but are now looking forward to a quick return to the English top flight.
They travel to Wembley after strong Championship campaigns, beaten only by the excellence of Leicester and Ipswich. At times they both looked on course for automatic promotion, but had to settle for what is widely known as the 'richest match in football'.
Here's everything you need to know about where to watch the match.
Where can you watch Leeds vs Southampton?
TV channel: In Great Britain the match will be broadcast live on Sky Sports Main Event and Football. Coverage starts at 2pm BST, ahead of the 3pm kick-off.
Live stream: Sky Sports subscribers can also watch the match live online via the Sky Go app.
Live blog: You can follow all the matchday action via Standard sport liveblog.