Montero represented Ecuador at the 2007 Pan American Games, and scored in the final match against Jamaica, a 2–1 win which brought the first international trophy in Ecuadorian football history.
He received his first senior call-up from coach Luis Fernando Suárez for an August 2007 friendly with Bolivia.

Montero made his senior debut for Ecuador on 21 November 2007 in a 2010 FIFA World Cup qualifier at home to Peru, coming on late in the second half in a 5–1 win.
He scored his first goal for the national team on 27 May 2009, in a 1–3 friendly loss to El Salvador, and his second came in the reverse fixture with Peru in Lima, which Ecuador won 2–1.

Montero was selected by national coach Reinaldo Rueda for his 2014 World Cup squad.
He made his debut in the tournament on 15 June in a 1–2 group stage loss against Switzerland; he started and played 77 minutes.
Montero represented Ecuador at the 2007 Pan American Games, and scored in the final match against Jamaica, a 2–1 win which brought the first international trophy in Ecuadorian football history. He received his first senior call-up from coach Luis Fernando Suárez for an August 2007 friendly with Bolivia.
Montero made his senior debut for Ecuador on 21 November 2007 in a 2010 FIFA World Cup qualifier at home to Peru, coming on late in the second half in a 5–1 win. He scored his first goal for the national team on 27 May 2009, in a 1–3 friendly loss to El Salvador, and his second came in the reverse fixture with Peru in Lima, which Ecuador won 2–1.
Montero was selected by national coach Reinaldo Rueda for his 2014 World Cup squad. He made his debut in the tournament on 15 June in a 1–2 group stage loss against Switzerland; he started and played 77 minutes.
Jefferson Montero