This study examines the factors that influence the mode choice of students in school trips using a multinomial logit model. It is found that students in not neighborhood schools, students from families with high income, high school students and female students are less likely to walk or bike in compare to other students. It is also found that there is no strong correlation between school size and whether the school is a neighborhood school. The methodology and results of this study help planners and policy makers to evaluate and prioritize Safe Routes to School programs.