Pachuca Paul Aguilar began his career with
Pachuca in 2002. He started off in Pachuca's affiliate (
second division) team,
Pachuca Juniors. In 2004, he was loaned to
Indios de Ciudad Juárez for two seasons in order to gain more experience. After returning to Pachuca in 2005 and making 27 appearances with the "B team" (Pachuca Juniors), Aguilar made his first-team debut in the
2006 Apertura tournament on 6 August in a match against
Cruz Azul, with the match ending in a 2–3 defeat. Paul Aguilar played the entire ninety minutes and scored a goal in the 56th minute of the game. Pachuca won the
2007 Clausura championship after defeating
América in the final. Paul Aguilar became a mainstay within the squad and won the confidence of manager
Enrique Meza. Aguilar would barely miss a game since earning a starting position at right-back during the
2008 Clausura. Paul Aguilar also participated in the
2008 and
2010 FIFA Club World Cups with Pachuca. His performance with the club earned him a spot in the final 23-man national team squad who would play the
2010 FIFA World Cup. After five years and ten seasons with Pachuca, Paul Aguilar was sold to
América for the
2011 Apertura in exchange for
Juan Carlos Silva and
Enrique Esqueda.
América On 23 May 2011, Aguilar officially joined Club América for the
Apertura tournament. Aguilar made his debut with América on 31 July in a league match against
Toluca, which ended in a 1–1 draw. Upon his arrival Aguilar became a popular player with the club's fans. He scored his first goal with América in the 90th minute against arch-rivals
Guadalajara in the
Súper Clásico. On 26 May 2013, Aguilar won his first title with América after defeating
Cruz Azul in the
Clausura final, playing in both legs. On 26 March 2014, Aguilar signed a two-year contract extension with América, which will keep him at the club until 2016. Aguilar had previously stated publicly that he would like to end his career at América. Aguilar made his 100th league appearance for América on 30 May in the 4–0 win over Guadalajara. Prior to the first-leg of the
2014 Apertura semifinal series against
Monterrey, it was reported that Aguilar was separated from the squad by manager
Antonio Mohamed due to an alleged dressing-room confrontation between the two. On 2 December 2020, Aguilar left
Club América.
Juárez On 19 July 2021, Aguilar signed with
FC Juárez. ==International career==