Youth Arriola spent years with
U.S. Soccer Development Academy club Arsenal FC based in
Temecula, California, a club that has produced several successful players including
Carlos Bocanegra and
Hector Jiménez, before joining the academy of the
Los Angeles Galaxy in 2013.
Tijuana In December 2012, Arriola was invited to train with Tijuana, after having previously trialed with the club. Following the 2012 season and despite being offered a professional contract by the Galaxy, Arriola opted to sign for
Club Tijuana of
Liga MX, the highest level of soccer in Mexico. Arriola was part of a string of American-born players to join the Xolos including
Edgar Castillo,
Herculez Gomez,
Joe Corona, and
Greg Garza. The Galaxy listed Tijuana's proximity to Arriola's hometown of San Diego, 18 miles, as one factor contributing to his decision to opt for Tijuana over the Galaxy. About his decision, Arriola himself stated, ""I felt that Xolos was the place for me. I love the club, it's my home team and the people down there are wonderful." The decision allowed Arriola to live on the United States side of the border with his family but cross it for training and matches. On July 19, 2013, Arriola made his professional league debut in a 3–3 draw with
Club Atlas to open the
2013–14 Liga MX season. Arriola was a second-half substitute and assisted on
Darío Benedetto's goal only four minutes after entering the match. Just a few days later, Arriola scored his second professional goal in
CONCACAF Champions League against
C.D. Victoria.
D.C. United On August 9, 2017, Arriola signed for
Major League Soccer side
D.C. United for a club record fee of $3,000,000 plus allocation money for his rights to
LA Galaxy. Arriola debuted for United on August 13, 2017, in a 1–0 loss against
Real Salt Lake. He scored his first goal for D.C. United in their season finale, and last game in
RFK Stadium on October 22, 2017, against the
New York Red Bulls. The game ended in a 2–1 loss. He ended his 2017 season with D.C. United with 11 appearances, two assists and only one goal. In the
2018 D.C. United season, Arriola's performances greatly improved. On July 14, 2018, in a 3–1 win against Vancouver Whitecaps, Arriola scored a personal record two goals for United in their inaugural match at
Audi Field. He ended the 2018 season with 28 appearances, 7 goals, and 8 assists. His injury was later revealed as a partially torn ACL. On February 22, D.C. United announced that Arriola was expected to miss the entire
2020 MLS season. On July 27, 2020, Arriola and D.C. United agreed to a multi-year contract extension through the 2023 season and an option for the 2024 season. Arriola returned to the field from his injury in D.C. United's last regular season game which ended in a 2–3 loss against
Montreal Impact on November 8, 2020, ending playoff hopes.
Loan to Swansea City On February 1, 2021, Arriola moved to
Swansea City until the end of the
2020–21 EFL Championship season. He made his debut on February 10, 2021, in a 1–3 loss against
Manchester City in the 5th round of the
2020–21 FA Cup. On March 31, 2021, Arriola's loan with Swansea ended after sustaining a quadriceps injury that would sideline him for 4–6 weeks.
FC Dallas On January 26, 2022, FC Dallas traded for Arriola in exchange for $1.5 million in General Allocation Money in 2022 and $500,000 in 2023. D.C. United would also retain 30% of any transfer outside of MLS, with an additional $300,000 in General Allocation Money if Arriola reaches certain performance-based metrics.
Seattle Sounders FC On January 12, 2025, Arriola moved to
Seattle Sounders FC. ==International career==