This study examines phonological variation in Korean honorific speech styles among female speakers in an online context. Data consisting of 1,041 instances of Korean honorific expressions such as -supnita and -yo, were collected from a chat board in the internet café Mom’s Holic Baby (MHB). Statistical analyses revealed that: 1) users in their 40s demonstrated a clear preference for the deferential speech style-supnita over the polite form -yo, 2) users in their 30s and 40s predominantly maintained the standard forms -supnita and -yo, exhibiting limited use of non-standard variants, and 3) the non-standard deferential variant -supnitang, and polite variants such as -yong, -yom, -yeo frequently appeared mostly among users in their 20s. The findings suggest that younger speakers are reconfiguring honorific forms to align with the informal, affective, and interactive nature of digital discourse, indicating that online platforms function as dynamic sites where linguistic norms are continuously negotiated and reshaped. This study contributes to ongoing discussions of sociolinguistic change by demonstrating how digital communication facilitates innovation in honorific practices.