In December 2008, Monteagudo and with his club and national teammate Manuel Salazar were invited for trials with Mexican Primera División A team Monterrey 1a.
After the two-week trial, Monteagudo was close to signing with the Mexican side, but ultimately he was not offered a contract, and he returned to El Salvador.
In the second leg of the semi-finals of the Clausura 2013, Monteagudo scored a crucial goal against Alianza in a 1–0 victory at the Sergio Torres Stadium.
With Audaz, Monteagudo reached the quarter-finals of the Apertura 2018, but the team of San Vicente was eliminated by Águila 3–4 on aggregate.
He has earned a total of 9 caps, scoring 1 goal and has represented his country in 2 FIFA World Cup qualification matches.