Career
Mejía came through the Chelona youth academy and had a couple of seasons at Alianza before moving abroad to play for Honduran giants Motagua. After six months he returned to El Salvador to play for Once Municipal and San Salvador F.C. In 2007 he joined Mexican side Cobras.
In December 2007, that was reported that Mejía would make a comeback to football after a year long injury had prevented him from taking part in competitive games at any level He impressed during trials at both USL First Division side Carolina RailHawks, and USL Second Division side Real Maryland in the early part of 2008, but ultimately decided to sign with the PDL team, Southern California Seahorses in the fourth division Premier Development League.
He scored three goals in 11 games for them.
He made his senior debut for El Salvador in a March 2001 friendly match against Panama and has earned a total of 19 caps, scoring 3 goals. His final international game was a September 2004 World Cup qualification match against the United States. International goals
Scores and results list El Salvador"s goal tally first.
Mejía is now an athletic director in one of three Football Club Barcelona schools in Mexico, in the Chihuahua state.