He has previously played in Major League Baseball (MLB) for the Chicago White Sox and St. Louis Cardinals.

[4] Flores made his professional debut in 2016 with the Arizona League White Sox and the Great Falls Voyagers, going 6–2 with a 3.46 ERA over 65 innings.

With the 2020 Chicago White Sox, Flores appeared in 2 games, compiling a 0-0 record with 9.00 ERA and 2 strikeouts in 2.0 innings pitched.

[10] Flores made one appearance with the Cardinals, spending most of his time with the Triple-A Memphis Redbirds, before he was designated for assignment on June 22, 2021.

[11] On June 24, 2021, Flores was claimed off waivers by the Colorado Rockies and optioned to the Triple-A Albuquerque Isotopes.

[14] On April 1, 2022, the same day he was released by the Rockies, Flores signed a minor league contract with the Cincinnati Reds organization and was assigned to the Triple-A Louisville Bats.

[17] He was assigned to the Triple-A Round Rock Express to begin the year,[18] but struggled to an 0-1 record and 7.71 ERA with 4 strikeouts in 4.2 innings pitched across 3 games (1 start).