Montiel had youth spells with
IK Franke and
Västerås SK, he made his first-team debut with the latter on 7 July 2012 in a
Division 1 Norra match against
Östersund. After not appearing for the club's senior team he left and rejoined Västerås SK in 2014. He scored his first Gefle goal in his second match, on 6 August, against
IFK Värnamo. On 5 December, Montiel agreed to join Superettan club
Örgryte IS. In his opening six matches, Montiel scored five goals and assisted four. He ended the
2018 campaign as top scorer, netting thirteen goals alongside fourteen assists in twenty-eight appearances. He departed at the conclusion of his contract in December. At the end of the month, Montiel secured a move to
Beerschot Wilrijk of the
Belgian First Division B. In July 2019, Beerschot allowed Montiel to speak to a Swedish club with a view to a transfer. Västerås SK revealed he was training with them on 8 July. On 15 July 2019,
Vejle BK confirmed that they had signed Montiel on a two-year contract. He scored twice, versus
Nykøbing and
Vendsyssel FF, in his first three appearances for Vejle BK. After two seasons at Vejle, Montiel joined
Danish 1st Division club
Vendsyssel FF on a two-year deal on 8 July 2021. He left the club at the end of his contract in June 2023. On 9 January 2024, Montiel joined newly relegated
Superettan side
Varbergs BoIS. On 14 December 2024, Icelandic side
Vestri announced the signing of Montiel. ==International career==