Muniain helped Daniel Vivian take the opener in the 67th minute when he met his run into the area with a free-kick for the defender to head home.
The Dutch striker scores with a blistering strike to help his team avoid its first defeat of the post-Messi era with a 1-1 draw.
Athletic entered this year's semifinals as the favorite against Levante, having already won the Spanish Super Cup in a final against Barcelona after defeating Real Madrid in the semis.
The Argentine great opened the scoring in the 20th minute with a free-kick shot that curled over the wall and found the top corner for his 12th league goal.
Iñaki Williams' goal in extra time gave Athletic the lead and a come-from-behind win.
Barcelona's all-time leading scorer has been nursing an unspecified fitness issue that caused coach Ronald Koeman to leave him out of the semifinal on Wednesday against Real Sociedad.
Athletic is looking to win its third Spanish Super Cup title, and first since beating Barcelona in the 2015 final. The Basque Country club also won the competition in 1984.
The match between Spanish league leader Atlético Madrid and Athletic Bilbao was put on hold after the Basque club’s plane was unable to land in the capital on Friday night.
Lionel Messi set up Frenkie de Jong for a goal to help earn a 1-0 win at Huesca on Sunday in the Argentine great’s 750th overall appearance for Barcelona and his 500th in the Spanish league.
Real Madrid are now level on points with league leaders Real Sociedad and second-placed Atletico Madrid with 26 points.
Athletic Bilbao vs Real Madrid, La Liga Live Streaming in India: Here are the details of when and where to watch Madrid vs Athletic live football match.
Rakitic broke the deadlock in the 71st minute to leave Barcelona three points in front of Madrid, who can retake the lead with a win because they have better tiebreakers.
Barcelona vs Athletic Bilbao, La Liga Live Streaming in India: Here are the details of When and Where to watch live Barca vs Athletic football match online.
Barcelona failed to set a return date for their talented playmaker who joined the Camp Nou side in the summer transfer window from Ajax in a reported 65 million pound deal.
The setback kept Diego Simeone’s team in sixth place, outside the Champions League spots.
Spain's oldest goalscorer and Athletic Bilbao's 'charismatic' striker Artiz Aduriz announced his retirement from football on Wednesday.
It will be the first time the two teams play for the Copa title since Athletic beat Sociedad in 1910 in the deciding match of a three-team mini-tournament.
Real Madrid lost to Real Sociedad 3-4 at home while a late goal from Athletic Bilbao knocked out Barcelona in the quarterfinals of Copa del Rey.
Real Madrid were held to a goalless draw by Athletic Bilbao in the La Liga clash, as they enter the winter break two points behind arch-rivals Barcelona.
Atletico defeated Athletic 2-0 in Madrid with goals by Saul Niguez and Alvaro Morata, joining leader Barcelona and moving one point ahead of Real Madrid.
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