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Barakaldo played the 1918–19 season in the Category C of the Regional Championship and became the champion without losing a single game throughout the season, promoted to category B.[2]
Barakaldo lost its place in the second category in the 1944–45 season, but in the 1945–46 season the club returned to the Segunda División.[2] Nevertheless, the next 1946–47 season was not successful for the club. It finished in the 11th position among 14 teams, just one point away from the last position.[3] In the following campaign Barakaldo improved its position, finishing 9th.[4]