The Rhinos meet favourites Wigan (1/4) in three weeks time at Wembley after completing an attritional comeback at unlucky Castleford.
Kevin Sinfield was the hero on a day of comebacks and slotted the winning kick in extra-time. He is 12/1 to be crowned man of the match at Wembley.
David Williams of Ladbrokes said: “Leeds have a lousy record in recent Challenge Cup finals but they might just believe that it’s their year after a last-gasp semi-final win.
The handicap mark for the final with Ladbrokes will be Leeds + 10 points.
1/4 Wigan Warriors
11/4 Leeds Rhinos
12/1 Kevin Sinfield to be man of the match at Wembley