Flannigan-Fowles played for the Arizona Wildcats for four seasons. He finished his collegiate career with 243 tackles, 10 tackles for loss, three forced fumbles, and two fumble recoveries with 22 passes defended and six interceptions in 50 games played.[1]
Flannigan-Fowles was signed by the San Francisco 49ers as an undrafted free agent on May 3, 2019.[3] He was waived on August 31, 2019, during final roster cuts but was re-signed to San Francisco's practice squad the following day.[4] Flannigan-Fowles was placed on the practice squad injured list on December 10, 2019.[5] He signed a futures/reserve contract with the 49ers on February 5, 2020, and made the active roster out of training camp in 2020.[6] In 2020 Flannigan-Fowles played in 11 games, mostly on special teams, with one started and finished the season with nine total tackles.[7] In the 2021 season, he appeared in all 17 games and started two. He had 29 total tackles.[8]
On March 11, 2022, Flannigan-Fowles signed a one-year extension with the 49ers.[9] He appeared in all 17 games in the 2022 season. He recorded one sack, which came against the Carolina Panthers in Week 5.[10]
On March 16, 2023, Flannigan-Fowles signed a one-year extension with the 49ers.[11] In the 2023 season, he appeared in 16 games and made one start.[12]
On March 15, 2024, Flannigan-Fowles re-signed with the 49ers.[13]