The main issue in Putrajaya’s bus services is related to time and cost. Optimal travel time require optimal routes and shortest distance. Minimizing travel time means minimizing operational cost. This paper reviews and evaluates the density of passengers and maximum number of passengers as parameters to obtain an optimum route. The mathematical model was utilized to analyze the passenger density with the improvements of the constraint to the number of passengers. The study based on data from intra-city bus services during off-peak hours. The main focus of this optimization is to compare the passenger density and the number of passengers as the parameters in decision making for bus routes. The result shows that the passenger density is better than the number passengers to assess bus routes.