The use of mobile banking has influenced on how people save and spend their money. This study investigated the relationship between Financial Literacy (FL), Mobile Banking Convenience (MBC), and Spending Attitudes (SA) among working millennials in General Santos City. Using Cochran’s formula, the computed sample size of the study is 385 working millennials. To achieve objectives of the study, the researcher employed quantitative research design specifically employing descriptive correlational research which aims to determine the demographic trend of the working millennials in General Santos City and to get the relationship between FL and SP, and MBC and SA. The result on the correlation shows the relationship between the FL and SP is statistically significant but weak. This suggest that as the level of FL among working millennials increase, their impulsive buying behavior decreases. The same result was found on the correlation between MBC and SP which shows negative and weak correlation with p-value of 0.003 indicating the observed correlation is significant.