A rightsided winger, Mejía made his debut for Honduras in a February 2007 UNCAF Nations Cup match against Nicaragua in which m he immediately scored a goal, and has, as of January 2013, earned a total of 14 caps, scoring 1 goal. He has represented his country in 3 FIFA World Cup qualification matches and played at the 2007 and 2009 UNCAF Nations Cups as well as at the 2009 CONCACAF Gold Cup.