The online-only subscription service has exclusively shown La Liga matches this season from Spain.
But just over 24 hours ahead of the first leg of their semi-final on Wednesday, a deal has been agreed to show both cup matches ahead of their upcoming league clash.
Eleven Sports Group chief-executive Marc Watson said: "Barcelona and Real Madrid are two of the world’s biggest clubs with a rivalry drenched in history.
"We are delighted to be bringing fans a hat-trick of El Clasicos in the space of just 24 days.
"Each clash will be a fantastic spectacle that will complement the exciting finale to the La Liga season."
Catalan giants Barca host Real at the Nou Camp on February 6 in the first game of the last-four tie, with kick-off scheduled for 8pm.
The return match at the Bernabeu will be staged three weeks later on February 27 at the same time.
Los Blancos will host Ernesto Valverde's side for a second time in a week on March 2, at 7.45pm.
All three games will play a pivotal role in determining where the biggest pieces of domestic silverware will end up this term.
El Clasico fixtures 2018-19
Wednesday, February 6
Copa del Rey semi-final first leg
8pm: Barcelona vs Real Madrid – Nou Camp
Wednesday, February 27
Copa del Rey semi-final second leg
8pm: Real Madrid vs Barcelona – Bernabeu
Saturday, March 2
La Liga
7:45pm: Real Madrid vs Barcelona – Bernabeu
The winners of the semi-final will face either Valencia or Real Betis in the final on May 25.
Betis' Estadio Benito Villamarín in Seville – where England beat Spain last October – will host the showcase final.
Valverde's team are bidding to win the competition for a fifth straight season.
In La Liga meanwhile, the reigning champions have an eight-point advantage at the top over third place Real, with Atletico Madrid six adrift in second.
Lionel Messi will be bidding to play against Real for the first time this season, having missed their La Liga clash with a broken arm, but is a doubt with a thigh problem.
Their first meeting this term saw Barcelona run-out 5-1 winners thanks to Luis Suarez's hat-trick, leading to the sacking of Julen Lopetegui.
News that Eleven Sports will broadcast the games comes as a major boost for the broadcaster.
Last week they announced the intention to drop coverage of Serie A and Eredivisie matches at the end of February to focus on the Spanish league.
In December, the self-styled 'Netflix of Sports' lost exclusive rights to the Ultimate Fighting Championship in the UK and Ireland, after an exit clause was triggered by the UFC.
The failure to secure distribution rights with pay-TV services including Sky, BT and Virgin limited their subscription numbers.
Reports last year were rife with suggestions they could even close in the UK less than a year after launching.
Users are charged £5.99 a month for the service, with 50,000 people thought to have signed up.
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