After Nathan Redmond did the damage in the first leg, Shane Long's late Anfield winner clinched victory to send the Saints to the showpiece event on Sunday 26th February.
Naturally, Long was delighted to put the icing on the cake, and was one of several Saints players to take to social media and revel in the moment.
Redmond also reflected on a great team performance while reserving praise for Jack Stephens, who stepped into the heart of the defence due to the absence of Virgil Van Dijk – and the Dutch defender also singled out the 22-year-old.
Oriol Romeu was another player to star in the second leg win at Anfield, capping off a fine week after putting pen to paper on a new deal at St Mary's the day before
Twenty-four hours later, the second semi-final reached its conclusion, with Manchester United joining Southampton at Wembley after overcoming Hull City over two legs.
It was a special night for Ander Herrera, who was delighted to get to another final after marking a century of appearances for the club in the second leg.
The Red Devils had gone 17 games unbeaten before Thursday night's loss, and Chris Smalling, Juan Mata and David De Gea tweeted their disappointment at the streak coming to an end - although it was very much a case of mission completed at the KCOM Stadium.
Finally, club captain Wayne Rooney and fellow England international Marcus Rashford paid tribute to the club's travelling fans, who can now enjoy a day out at the national stadium on Sunday 26th February.