AFC Bournemouth and Milton Keynes Dons were the defeated semi-finalists, losing to Huddersfield Town and Peterborough United respectively.
Huddersfield Town finished five points behind Southampton (who were promoted in second place) and eight behind league winners Brighton & Hove Albion.
Craig Mackail-Smith gave the visitors the lead in the 8th minute, scoring after MK Dons goalkeeper David Martin pushed away a strike from Nathaniel Mendez-Laing.
With nine minutes remaining, Stephen Gleeson was also sent off, for a foul on Mark Little, and Grant McCann converted the subsequent penalty to make the final score 3–2 to MK Dons.
McCann scored in the 11th minute from a free-kick to put Peterborough into the lead before Mackail-Smith's close-range strike made it 2–0 and sent his side to the final with a 4–3 aggregate victory.
Danny Ward restored the home side's lead just before half-time with a strike past Bournemouth's goalkeeper Shwan Jalal.
Ings scored for Bournemouth from a Marc Pugh cross in the 104th minute but Antony Kay equalised almost immediately with a header from a Roberts corner.
Michael Symes and Lee Novak scored the opening penalties for Bournemouth and Huddersfield respectively but Liam Feeney's spot-kick was saved by Bennett.
Peterborough won the first league encounter 4–2 at London Road in August 2010; Huddersfield secured a 3–2 victory six weeks later in the cup competition.
Roberts' free-kick was then tipped round the post by Jones before Afobe struck wide from 8 yards (7.3 metres) from the resulting corner.
[23] The first chance of the second half fell to McCann who struck a curling free-kick over the bar from around 20 yards (18 metres), before Ward's run down the wing ended with his shot striking the Peterborough crossbar.
In immediate response, Danny Cadamarteri was brought on for Ward as Huddersfield switched to two strikers, but Mackail-Smith doubled Peterborough's lead within two minutes, his shot deflecting into the goal off Kay.
With five minutes remaining, McCann increased his side's lead with a long-range strike before Lee Tomlin's shot went over the Huddersfield crossbar.
[23] Match officials: Darren Ferguson, the Peterborough manager, was quick to praise his chairman, Darragh MacAnthony, noting "he's spent money, had a right go and had the bottle to get me back at the club".
[22] He also noted that his father, Manchester United manager Alex Ferguson, had not been present at the final, calling him a "jinx" and jokingly attributing Peterborough's semi-final first-leg loss to MK Dons to him.