On the basis of 24 speakers' recorded speech this paper examines the variable deletion of w in two regional dialects, Cheonan-Asan Korean and Daegu Korean. Varbrul analyses are conducted using the 3965 tokens of (w). Results of the combined and separate analyses show that the two dialects are subject to very similar constraints in w deletion, though deletion rates and the strengths of the constraints on the deletion process are somewhat different. It is suggested that the syllable structure of young Daegu Korean speakers might be rather different from that of older speakers, and that dialect leveling from contact with Standard Korean could be the cause of this change.