Organizations striving to improve cycle time concentrate on developing long-term relationship with suppliers. In order to support organizational efforts, this study develops a conceptual model that explores the relationships among leadership behaviors, relational commitment and trust, information exchange, and cycle time. Although the supply chain management literature mentions leadership behavior in the context of supply chain, there are no studies that examine the impact of leadership behaviors on cycle time. This study proposes that transformational and transactional leadership behaviors of buyers increase the flow of information to suppliers directly as well as indirectly through relational commitment and trust, and these relationships also influence cycle time. However, it also proposes that the impact of transformational leadership behaviors on relational commitment and trust and information exchange is stronger than the impact of transactional leadership behaviors. Additionally, both uncertain environment and supplier base have potential to play moderation roles in the relationship between transformational leadership and relational commitment and trust and between transformational leadership and information exchange.