'Aa Ab Laut Chalen' is a story of a young man (Akshaye Khanna) who goes to the U.S.A. in search of a job. After trying his hands as a cab driver and later, as a helper in a fast food joint, he tries to win over the heart of a rich Indian girl (Suman Ranganathan), a citizen of U.S.A., so that he can manage a foothold in the country. Since the girl is too out-going and their thoughts don't match, he turns to another girl (Aishwarya Rai) who loves him, whom he had discarded for Suman. Aishwarya gets him a job in the office of a business tycoon, who incidently is his father. After an emotional confrontation, the father and the son return to their roots in india with the girl.