Antenatal care is widely acknowledged as an effective tool to prevent adverse outcomes in pregnant women and their children. In Malaysia, early entry to antenatal care refers to a first visit within the 12th week of gestation. Delayed access to antenatal care has not been extensively studied in Malaysia, whereas several studies have reported a high prevalence of late antenatal booking in developing countries. The objective of this study was to determine the factors and barriers associated with late antenatal booking and the level of knowledge about the timing of antenatal booking among women of childbearing age in the Lundu Districtof Sarawak.